Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3386 insertions, 0 deletions

diff --git a/toolkit/moz.configure b/toolkit/moz.configure
new file mode 100644
index 0000000000..bca832a94d
--- /dev/null
+++ b/toolkit/moz.configure
@@ -0,0 +1,3386 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Set the MOZ_CONFIGURE_OPTIONS variable with all the options that
+# were passed somehow (environment, command line, mozconfig)
+@dependable
+@imports(_from="mozbuild.shellutil", _import="quote")
+@imports(_from="mozbuild.util", _import="ensure_unicode")
+@imports(_from="mozbuild.util", _import="system_encoding")
+@imports("__sandbox__")
+def all_configure_options():
+    result = []
+    previous = None
+    for option in __sandbox__._options.values():
+        # __sandbox__._options contains items for both option.name and
+        # option.env. But it's also an OrderedDict, meaning both are
+        # consecutive.
+        # Also ignore OLD_CONFIGURE and MOZCONFIG because they're not
+        # interesting.
+        if option == previous or option.env in ("OLD_CONFIGURE", "MOZCONFIG"):
+            continue
+        previous = option
+        value = __sandbox__._value_for(option)
+        # We only want options that were explicitly given on the command
+        # line, the environment, or mozconfig, and that differ from the
+        # defaults.
+        if (
+            value is not None
+            and value.origin not in ("default", "implied")
+            and value != option.default
+        ):
+            result.append(
+                ensure_unicode(__sandbox__._raw_options[option], system_encoding)
+            )
+        # We however always include options that are sent to old configure
+        # because we don't know their actual defaults. (Keep the conditions
+        # separate for ease of understanding and ease of removal)
+        elif (
+            option.help == "Help missing for old configure options"
+            and option in __sandbox__._raw_options
+        ):
+            result.append(
+                ensure_unicode(__sandbox__._raw_options[option], system_encoding)
+            )
+
+    # We shouldn't need this, but currently, quote will return a byte string
+    # if result is empty, and that's not wanted here.
+    if not result:
+        return ""
+
+    return quote(*result)
+
+
+set_config("MOZ_CONFIGURE_OPTIONS", all_configure_options)
+
+
+@depends(target)
+def fold_libs(target):
+    return target.os in ("WINNT", "OSX", "Android")
+
+
+set_config("MOZ_FOLD_LIBS", fold_libs)
+
+# Profiling
+# ==============================================================
+# Some of the options here imply an option from js/moz.configure,
+# so, need to be declared before the include.
+
+option(
+    "--enable-jprof",
+    env="MOZ_JPROF",
+    help="Enable jprof profiling tool (needs mozilla/tools/jprof)",
+)
+
+
+@depends("--enable-jprof")
+def jprof(value):
+    if value:
+        return True
+
+
+set_config("MOZ_JPROF", jprof)
+set_define("MOZ_JPROF", jprof)
+imply_option("--enable-profiling", jprof)
+
+
+@depends(target)
+def gecko_profiler(target):
+    if target.os == "Android":
+        return target.cpu in ("aarch64", "arm", "x86", "x86_64")
+    elif target.kernel == "Linux":
+        return target.cpu in ("aarch64", "arm", "x86", "x86_64", "mips64")
+    elif target.kernel == "FreeBSD":
+        return target.cpu in ("aarch64", "x86_64")
+    return target.os in ("OSX", "WINNT")
+
+
+@depends(gecko_profiler)
+def gecko_profiler_define(value):
+    if value:
+        return True
+
+
+set_config("MOZ_GECKO_PROFILER", gecko_profiler_define)
+set_define("MOZ_GECKO_PROFILER", gecko_profiler_define)
+
+
+# Whether code to parse ELF binaries should be compiled for the Gecko profiler
+# (for symbol table dumping).
+@depends(gecko_profiler, target)
+def gecko_profiler_parse_elf(value, target):
+    # Currently we only want to build this code on Linux (including Android) and BSD.
+    # For Android, this is in order to dump symbols from Android system, where
+    # on other platforms there exist alternatives that don't require bloating
+    # up our binary size. For Linux more generally, we use this in profile
+    # pre-symbolication support, since MozDescribeCodeAddress doesn't do
+    # anything useful on that platform. (Ideally, we would update
+    # MozDescribeCodeAddress to call into some Rust crates that parse ELF and
+    # DWARF data, but build system issues currently prevent Rust from being
+    # used in mozglue.)
+    if value and (target.kernel == "Linux" or target.kernel == "FreeBSD"):
+        return True
+
+
+set_config("MOZ_GECKO_PROFILER_PARSE_ELF", gecko_profiler_parse_elf)
+set_define("MOZ_GECKO_PROFILER_PARSE_ELF", gecko_profiler_parse_elf)
+
+# enable this by default if the profiler is enabled
+# Note: also requires jemalloc
+set_config("MOZ_PROFILER_MEMORY", gecko_profiler_define)
+set_define("MOZ_PROFILER_MEMORY", gecko_profiler_define)
+
+
+@depends(
+    "--enable-debug",
+    milestone,
+    build_project,
+    # Artifact builds are included because the downloaded artifacts can
+    # have DMD enabled.
+    when=artifact_builds | depends(when="--enable-replace-malloc")(lambda: True),
+)
+def dmd_default(debug, milestone, build_project):
+    return bool(build_project == "browser" and (debug or milestone.is_nightly))
+
+
+option(
+    "--enable-dmd",
+    env="MOZ_DMD",
+    default=dmd_default,
+    help="{Enable|Disable} Dark Matter Detector (heap profiler). "
+    "Also enables jemalloc, replace-malloc and profiling",
+)
+
+
+@depends("--enable-dmd")
+def dmd(value):
+    if value:
+        return True
+
+
+set_config("MOZ_DMD", dmd)
+set_define("MOZ_DMD", dmd)
+imply_option("--enable-profiling", dmd)
+imply_option("--enable-jemalloc", dmd, when=compile_environment)
+imply_option("--enable-replace-malloc", dmd, when=compile_environment)
+
+# midir-based Web MIDI support
+# ==============================================================
+@depends(target)
+def midir_linux_support(target):
+    return (
+        target.kernel == "Linux" and target.os != "Android" and target.cpu != "riscv64"
+    )
+
+
+@depends(target, midir_linux_support)
+def midir_support(target, midir_linux_support):
+    if target.os in ("WINNT", "OSX") or midir_linux_support:
+        return True
+
+
+set_config("MOZ_WEBMIDI_MIDIR_IMPL", midir_support)
+
+# Enable various cubeb backends
+# ==============================================================
+@depends(target)
+def audio_backends_default(target):
+    if target.os == "Android":
+        return (
+            "aaudio",
+            "opensl",
+        )
+    elif target.os in ("DragonFly", "FreeBSD", "SunOS"):
+        return ("oss",)
+    elif target.os == "OpenBSD":
+        return ("sndio",)
+    elif target.os == "OSX":
+        return ("audiounit",)
+    elif target.os == "NetBSD":
+        return ("sunaudio",)
+    elif target.os == "SunOS":
+        return ("sunaudio",)
+    elif target.os == "WINNT":
+        return ("wasapi",)
+    else:
+        return ("pulseaudio",)
+
+
+option(
+    "--enable-audio-backends",
+    nargs="+",
+    choices=(
+        "aaudio",
+        "alsa",
+        "audiounit",
+        "jack",
+        "opensl",
+        "oss",
+        "pulseaudio",
+        "sndio",
+        "sunaudio",
+        "wasapi",
+    ),
+    default=audio_backends_default,
+    help="{Enable|Disable} various cubeb backends",
+)
+
+
+@depends("--enable-audio-backends", target)
+def imply_aaudio(values, target):
+    if any("aaudio" in value for value in values) and target.os != "Android":
+        die("Cannot enable AAudio on %s", target.os)
+    return any("aaudio" in value for value in values) or None
+
+
+@depends("--enable-audio-backends", target)
+def imply_alsa(values, target):
+    if (
+        any("alsa" in value for value in values)
+        and target.kernel != "Linux"
+        and target.os != "FreeBSD"
+    ):
+        die("Cannot enable ALSA on %s", target.os)
+    return any("alsa" in value for value in values) or None
+
+
+@depends("--enable-audio-backends", target)
+def imply_audiounit(values, target):
+    if (
+        any("audiounit" in value for value in values)
+        and target.os != "OSX"
+        and target.kernel != "Darwin"
+    ):
+        die("Cannot enable AudioUnit on %s", target.os)
+    return any("audiounit" in value for value in values) or None
+
+
+@depends("--enable-audio-backends")
+def imply_jack(values):
+    return any("jack" in value for value in values) or None
+
+
+@depends("--enable-audio-backends", target)
+def imply_opensl(values, target):
+    if any("opensl" in value for value in values) and target.os != "Android":
+        die("Cannot enable OpenSL on %s", target.os)
+    return any("opensl" in value for value in values) or None
+
+
+@depends("--enable-audio-backends", target)
+def imply_oss(values, target):
+    if any("oss" in value for value in values) and (
+        target.os == "Android" or target.os == "OSX" or target.os == "WINNT"
+    ):
+        die("Cannot enable OSS on %s", target.os)
+    return any("oss" in value for value in values) or None
+
+
+@depends("--enable-audio-backends", target)
+def imply_pulseaudio(values, target):
+    if any("pulseaudio" in value for value in values) and (
+        target.os == "Android" or target.os == "OSX" or target.os == "WINNT"
+    ):
+        die("Cannot enable PulseAudio on %s", target.os)
+    return any("pulseaudio" in value for value in values) or None
+
+
+@depends("--enable-audio-backends", target)
+def imply_sndio(values, target):
+    if any("sndio" in value for value in values) and (
+        target.os == "Android" or target.os == "OSX" or target.os == "WINNT"
+    ):
+        die("Cannot enable sndio on %s", target.os)
+    return any("sndio" in value for value in values) or None
+
+
+@depends("--enable-audio-backends", target)
+def imply_sunaudio(values, target):
+    if any("sunaudio" in value for value in values) and (
+        target.os != "NetBSD" and target.os != "SunOS"
+    ):
+        die("Cannot enable sunaudio on %s", target.os)
+    return any("sunaudio" in value for value in values) or None
+
+
+@depends("--enable-audio-backends", target)
+def imply_wasapi(values, target):
+    if any("wasapi" in value for value in values) and target.os != "WINNT":
+        die("Cannot enable WASAPI on %s", target.os)
+    return any("wasapi" in value for value in values) or None
+
+
+set_config("MOZ_AAUDIO", imply_aaudio, when="--enable-audio-backends")
+
+imply_option("--enable-alsa", imply_alsa, reason="--enable-audio-backends")
+
+set_config("MOZ_AUDIOUNIT_RUST", imply_audiounit, when="--enable-audio-backends")
+
+imply_option("--enable-jack", imply_jack, reason="--enable-audio-backends")
+
+set_config("MOZ_OPENSL", imply_opensl, when="--enable-audio-backends")
+
+set_config("MOZ_OSS", imply_oss, when="--enable-audio-backends")
+
+imply_option("--enable-pulseaudio", imply_pulseaudio, reason="--enable-audio-backends")
+
+imply_option("--enable-sndio", imply_sndio, reason="--enable-audio-backends")
+
+set_config("MOZ_SUNAUDIO", imply_sunaudio, when="--enable-audio-backends")
+
+set_config("MOZ_WASAPI", imply_wasapi, when="--enable-audio-backends")
+
+# ALSA cubeb backend
+# ==============================================================
+option("--enable-alsa", env="MOZ_ALSA", help="Enable ALSA audio backend.")
+
+
+@depends("--enable-alsa", midir_linux_support)
+def enable_alsa_or_midir_linux_support(alsa_enabled, midir_linux_support):
+    return alsa_enabled or midir_linux_support
+
+
+pkg_check_modules("MOZ_ALSA", "alsa", when=enable_alsa_or_midir_linux_support)
+
+set_config("MOZ_ALSA", True, when="--enable-alsa")
+set_define("MOZ_ALSA", True, when="--enable-alsa")
+
+# JACK cubeb backend
+# ==============================================================
+system_lib_option("--enable-jack", env="MOZ_JACK", help="Enable JACK audio backend.")
+
+jack = pkg_check_modules("MOZ_JACK", "jack", when="--enable-jack")
+
+set_config("MOZ_JACK", depends_if(jack)(lambda _: True))
+
+# PulseAudio cubeb backend
+# ==============================================================
+option(
+    "--enable-pulseaudio",
+    env="MOZ_PULSEAUDIO",
+    help="{Enable|Disable} PulseAudio audio backend.",
+)
+
+pulseaudio = pkg_check_modules("MOZ_PULSEAUDIO", "libpulse", when="--enable-pulseaudio")
+
+set_config("MOZ_PULSEAUDIO", depends_if(pulseaudio)(lambda _: True))
+set_define("MOZ_PULSEAUDIO", depends_if(pulseaudio)(lambda _: True))
+
+# sndio cubeb backend
+# ==============================================================
+system_lib_option("--enable-sndio", env="MOZ_SNDIO", help="Enable sndio audio backend.")
+
+sndio = pkg_check_modules("MOZ_SNDIO", "sndio", when="--enable-sndio")
+
+set_config("MOZ_SNDIO", depends_if(sndio)(lambda _: True))
+
+# Javascript engine
+# ==============================================================
+include("../js/moz.configure")
+
+
+# NodeJS
+# ==============================================================
+include("../build/moz.configure/node.configure")
+
+# JsonCpp
+# ==============================================================
+set_define("JSON_USE_EXCEPTION", 0)
+
+# L10N
+# ==============================================================
+option("--with-l10n-base", nargs=1, env="L10NBASEDIR", help="Path to l10n repositories")
+
+
+@depends("--with-l10n-base", "MOZ_AUTOMATION", build_environment)
+@imports(_from="os.path", _import="isdir")
+@imports(_from="os.path", _import="expanduser")
+@imports(_from="os", _import="environ")
+def l10n_base(value, automation, build_env):
+    if value:
+        path = value[0]
+        if not isdir(path):
+            die("Invalid value --with-l10n-base, %s doesn't exist", path)
+    elif automation:
+        path = os.path.join(build_env.topsrcdir, "../l10n-central")
+    else:
+        path = os.path.join(
+            environ.get(
+                "MOZBUILD_STATE_PATH", expanduser(os.path.join("~", ".mozbuild"))
+            ),
+            "l10n-central",
+        )
+    return os.path.realpath(os.path.abspath(path))
+
+
+set_config("L10NBASEDIR", l10n_base)
+
+
+# Default toolkit
+# ==============================================================
+@depends(target)
+def toolkit_choices(target):
+    if target.os == "WINNT":
+        return ("cairo-windows",)
+    elif target.os == "OSX":
+        return ("cairo-cocoa",)
+    elif target.os == "Android":
+        return ("cairo-android",)
+    else:
+        return (
+            "cairo-gtk3",
+            "cairo-gtk3-wayland",
+            "cairo-gtk3-wayland-only",
+            "cairo-gtk3-x11-wayland",
+        )
+
+
+@depends(toolkit_choices)
+def toolkit_default(choices):
+    return choices[0]
+
+
+option(
+    "--enable-default-toolkit",
+    nargs=1,
+    choices=toolkit_choices,
+    default=toolkit_default,
+    help="Select default toolkit",
+)
+
+
+@depends("--enable-default-toolkit")
+def full_toolkit(value):
+    if value:
+        return value[0]
+
+
+@depends(full_toolkit)
+def toolkit(toolkit):
+    if toolkit.startswith("cairo-gtk3"):
+        widget_toolkit = "gtk"
+    else:
+        widget_toolkit = toolkit.replace("cairo-", "")
+    return widget_toolkit
+
+
+set_config("MOZ_WIDGET_TOOLKIT", toolkit)
+add_old_configure_assignment("MOZ_WIDGET_TOOLKIT", toolkit)
+
+
+@depends(toolkit)
+def toolkit_define(toolkit):
+    if toolkit != "windows":
+        return "MOZ_WIDGET_%s" % toolkit.upper()
+
+
+set_define(toolkit_define, True)
+
+
+@depends(toolkit)
+def toolkit_gtk(toolkit):
+    return toolkit == "gtk"
+
+
+# Wayland support
+# ==============================================================
+wayland_headers = pkg_check_modules(
+    "MOZ_WAYLAND",
+    "gtk+-wayland-3.0 >= 3.14 xkbcommon >= 0.4.1",
+    allow_missing=depends(full_toolkit)(lambda t: t == "cairo-gtk3"),
+    when=toolkit_gtk,
+)
+
+
+@depends(wayland_headers, toolkit_gtk, artifact_builds)
+def wayland_headers(wayland, toolkit_gtk, artifacts):
+    if toolkit_gtk and artifacts:
+        return True
+    return wayland
+
+
+set_config("MOZ_WAYLAND", depends_if(wayland_headers)(lambda _: True))
+set_define("MOZ_WAYLAND", depends_if(wayland_headers)(lambda _: True))
+
+# Hardware-accelerated video decode with VAAPI and V4L2
+# ==============================================================
+
+
+@depends(target, wayland_headers)
+def vaapi(target, wayland_headers):
+    # VAAPI is only used in Wayland. It's mostly used on x86(-64) but is
+    # sometimes used on ARM/ARM64 SOCs. Wayland implies GTK and Linux.
+    if target.cpu in ("arm", "aarch64", "x86", "x86_64") and wayland_headers:
+        return True
+
+
+@depends(target, wayland_headers)
+def v4l2(target, wayland_headers):
+    # V4L2 decode is only used in Wayland, and generally only appears on
+    # embedded SOCs. Wayland implies GTK and Linux.
+    if target.cpu in ("arm", "aarch64", "riscv64") and wayland_headers:
+        return True
+
+
+set_config("MOZ_ENABLE_VAAPI", True, when=vaapi)
+set_config("MOZ_ENABLE_V4L2", True, when=v4l2)
+set_define("MOZ_ENABLE_VAAPI", True, when=vaapi)
+set_define("MOZ_ENABLE_V4L2", True, when=v4l2)
+
+# GL Provider
+# ==============================================================
+option("--with-gl-provider", nargs=1, help="Set GL provider backend type")
+
+
+@depends("--with-gl-provider")
+def gl_provider(value):
+    if value:
+        return value[0]
+
+
+@depends(gl_provider)
+def gl_provider_define(provider):
+    if provider:
+        return "GLContextProvider%s" % provider
+
+
+set_define("MOZ_GL_PROVIDER", gl_provider_define)
+
+
+@depends(gl_provider, toolkit_gtk)
+def gl_default_provider(value, toolkit_gtk):
+    if value:
+        return value
+    elif toolkit_gtk:
+        return "EGL"
+
+
+set_config("MOZ_GL_PROVIDER", gl_provider)
+set_config("MOZ_GL_DEFAULT_PROVIDER", gl_default_provider)
+
+
+@depends(gl_default_provider)
+def gl_provider_define(provider):
+    if provider:
+        return "GL_PROVIDER_%s" % provider
+
+
+set_define(gl_provider_define, True)
+
+
+# PDF printing
+# ==============================================================
+@depends(toolkit)
+def pdf_printing(toolkit):
+    if toolkit in ("windows", "gtk", "android"):
+        return True
+
+
+set_config("MOZ_PDF_PRINTING", pdf_printing)
+set_define("MOZ_PDF_PRINTING", pdf_printing)
+
+
+# Event loop instrumentation
+# ==============================================================
+option(env="MOZ_INSTRUMENT_EVENT_LOOP", help="Force-enable event loop instrumentation")
+
+
+@depends("MOZ_INSTRUMENT_EVENT_LOOP", toolkit)
+def instrument_event_loop(value, toolkit):
+    if value or (
+        toolkit in ("windows", "gtk", "cocoa", "android") and value.origin == "default"
+    ):
+        return True
+
+
+set_config("MOZ_INSTRUMENT_EVENT_LOOP", instrument_event_loop)
+set_define("MOZ_INSTRUMENT_EVENT_LOOP", instrument_event_loop)
+
+
+# Fontconfig Freetype
+# ==============================================================
+option(env="USE_FC_FREETYPE", help="Force-enable the use of fontconfig freetype")
+
+
+@depends("USE_FC_FREETYPE", toolkit)
+def fc_freetype(value, toolkit):
+    if value or (toolkit == "gtk" and value.origin == "default"):
+        return True
+
+
+set_define("USE_FC_FREETYPE", fc_freetype)
+
+# Pango
+# ==============================================================
+pkg_check_modules("MOZ_PANGO", "pango >= 1.22.0", when=toolkit_gtk)
+
+# Fontconfig
+# ==============================================================
+fontconfig_info = pkg_check_modules(
+    "_FONTCONFIG", "fontconfig >= 2.7.0", when=fc_freetype
+)
+
+
+@depends(fc_freetype)
+def check_for_freetype2(fc_freetype):
+    if fc_freetype:
+        return True
+
+
+# Check for freetype2. Flags are combined with fontconfig flags.
+freetype2_info = pkg_check_modules(
+    "_FT2", "freetype2 >= 9.10.3", when=check_for_freetype2
+)
+
+
+@depends(fontconfig_info, freetype2_info)
+def freetype2_combined_info(fontconfig_info, freetype2_info):
+    if not freetype2_info:
+        return
+    if not fontconfig_info:
+        return freetype2_info
+    return namespace(
+        cflags=freetype2_info.cflags + fontconfig_info.cflags,
+        libs=freetype2_info.libs + fontconfig_info.libs,
+    )
+
+
+set_define("MOZ_HAVE_FREETYPE2", depends_if(freetype2_info)(lambda _: True))
+
+# Apple platform decoder support
+# ==============================================================
+@depends(toolkit)
+def applemedia(toolkit):
+    if toolkit in ("cocoa", "uikit"):
+        return True
+
+
+set_config("MOZ_APPLEMEDIA", applemedia)
+set_define("MOZ_APPLEMEDIA", applemedia)
+
+# Windows Media Foundation support
+# ==============================================================
+option("--disable-wmf", help="Disable support for Windows Media Foundation")
+
+
+@depends("--disable-wmf", target, "--help")
+def wmf(value, target, _):
+    enabled = bool(value)
+    if value.origin == "default":
+        # Enable Windows Media Foundation support by default.
+        # Note our minimum SDK version is Windows 7 SDK, so we are (currently)
+        # guaranteed to have a recent-enough SDK to build WMF.
+        enabled = target.os == "WINNT"
+    if enabled and target.os != "WINNT":
+        die("Cannot enable Windows Media Foundation support on %s", target.os)
+    if enabled:
+        return True
+
+
+@depends(c_compiler, when=wmf)
+def wmfmediaengine(c_compiler):
+    return c_compiler and c_compiler.type == "clang-cl"
+
+
+set_config("MOZ_WMF", wmf)
+set_define("MOZ_WMF", wmf)
+
+set_config("MOZ_WMF_MEDIA_ENGINE", True, when=wmfmediaengine)
+set_define("MOZ_WMF_MEDIA_ENGINE", True, when=wmfmediaengine)
+
+# FFmpeg H264/AAC Decoding Support
+# ==============================================================
+option("--disable-ffmpeg", help="Disable FFmpeg for fragmented H264/AAC decoding")
+
+
+@depends("--disable-ffmpeg", target)
+def ffmpeg(value, target):
+    enabled = bool(value)
+    if value.origin == "default":
+        enabled = target.os not in ("Android", "WINNT")
+    if enabled:
+        return True
+
+
+set_config("MOZ_FFMPEG", ffmpeg)
+set_define("MOZ_FFMPEG", ffmpeg)
+imply_option("--enable-fmp4", ffmpeg, "--enable-ffmpeg")
+
+# AV1 Video Codec Support
+# ==============================================================
+option("--disable-av1", help="Disable av1 video support")
+
+
+@depends("--enable-av1")
+def av1(value):
+    if value:
+        return True
+
+
+@depends(target, when=av1 & compile_environment)
+def dav1d_asm(target):
+    if target.cpu in ("aarch64", "x86", "x86_64"):
+        return True
+
+
+@depends(target, when=av1 & compile_environment)
+def dav1d_nasm(target):
+    if target.cpu in ("x86", "x86_64"):
+        return namespace(version="2.14", what="AV1")
+
+
+set_config("MOZ_DAV1D_ASM", dav1d_asm)
+set_define("MOZ_DAV1D_ASM", dav1d_asm)
+set_config("MOZ_AV1", av1)
+set_define("MOZ_AV1", av1)
+
+# JXL Image Codec Support
+# ==============================================================
+option("--disable-jxl", help="Disable jxl image support")
+
+
+@depends("--disable-jxl", milestone.is_nightly)
+def jxl(value, is_nightly):
+    if is_nightly and value:
+        return True
+
+
+set_config("MOZ_JXL", jxl)
+set_define("MOZ_JXL", jxl)
+
+# Built-in fragmented MP4 support.
+# ==============================================================
+option(
+    "--disable-fmp4",
+    env="MOZ_FMP4",
+    help="Disable support for in built Fragmented MP4 parsing",
+)
+
+
+@depends("--disable-fmp4", target, wmf, applemedia)
+def fmp4(value, target, wmf, applemedia):
+    enabled = bool(value)
+    if value.origin == "default":
+        # target.os == 'Android' includes all B2G versions
+        enabled = wmf or applemedia or target.os == "Android"
+    if enabled:
+        return True
+
+
+set_config("MOZ_FMP4", fmp4)
+set_define("MOZ_FMP4", fmp4)
+
+
+@depends(target)
+def sample_type_is_s16(target):
+    # Use integers over floats for audio on Android regardless of the CPU
+    # architecture, because audio backends for Android don't support floats.
+    # We also use integers on ARM because it's more efficient.
+    if target.os == "Android" or target.cpu == "arm":
+        return True
+
+
+@depends(sample_type_is_s16)
+def sample_type_is_float(t):
+    if not t:
+        return True
+
+
+set_config("MOZ_SAMPLE_TYPE_S16", sample_type_is_s16)
+set_define("MOZ_SAMPLE_TYPE_S16", sample_type_is_s16)
+set_config("MOZ_SAMPLE_TYPE_FLOAT32", sample_type_is_float)
+set_define("MOZ_SAMPLE_TYPE_FLOAT32", sample_type_is_float)
+
+set_define("MOZ_VORBIS", sample_type_is_float)
+set_config("MOZ_VORBIS", sample_type_is_float)
+set_define("MOZ_TREMOR", sample_type_is_s16)
+set_config("MOZ_TREMOR", sample_type_is_s16)
+
+option(
+    "--disable-real-time-tracing",
+    help="Disable tracing of real-time audio callbacks",
+)
+
+set_config("MOZ_REAL_TIME_TRACING", True, when="--enable-real-time-tracing")
+set_define("MOZ_REAL_TIME_TRACING", True, when="--enable-real-time-tracing")
+
+# OpenMAX IL Decoding Support
+# ==============================================================
+option("--enable-openmax", help="Enable OpenMAX IL for video/audio decoding")
+
+
+@depends("--enable-openmax")
+def openmax(value):
+    enabled = bool(value)
+    if enabled:
+        return True
+
+
+set_config("MOZ_OMX", openmax)
+set_define("MOZ_OMX", openmax)
+
+# EME Support
+# ==============================================================
+@depends(target, wmf)
+def eme_choices(target, wmf):
+    if (
+        target.kernel in ("WINNT", "Linux")
+        and target.os != "Android"
+        and target.cpu in ("x86", "x86_64")
+    ):
+        if wmf:
+            return ("widevine", "wmfcdm")
+        return ("widevine",)
+    if target.kernel == "WINNT" and target.cpu == "aarch64":
+        return ("widevine",)
+    if target.os in ("OSX"):
+        return ("widevine",)
+
+
+# Widevine is enabled by default in desktop browser builds, except
+# on aarch64 Windows.
+@depends(build_project, eme_choices, target)
+def eme_default(build_project, choices, target):
+    if build_project == "browser":
+        if target.kernel != "WINNT" or target.cpu != "aarch64":
+            return choices
+
+
+option(
+    "--enable-eme",
+    nargs="+",
+    choices=eme_choices,
+    default=eme_default,
+    when=eme_choices,
+    help="{Enable|Disable} support for Encrypted Media Extensions",
+)
+
+
+@depends("--enable-eme", fmp4, when=eme_choices)
+def eme(enabled, fmp4):
+    if enabled and enabled.origin != "default" and not fmp4:
+        die("Encrypted Media Extension support requires " "Fragmented MP4 support")
+
+
+@depends("--enable-eme", when=eme_choices)
+def eme_modules(value):
+    return value
+
+
+# Fallback to an empty list when eme_choices is empty, setting eme_modules to
+# None.
+set_config("MOZ_EME_MODULES", eme_modules | dependable([]))
+
+
+@depends(eme_modules, target, when=eme_modules)
+def eme_win32_artifact(modules, target):
+    if "widevine" in modules and target.kernel == "WINNT" and target.cpu == "aarch64":
+        return True
+
+
+set_config("MOZ_EME_WIN32_ARTIFACT", eme_win32_artifact)
+
+
+# Media Foundation CDM support
+# ==============================================================
+@depends(eme_modules, when=wmfmediaengine)
+def wmfcdm(modules):
+    if "wmfcdm" in modules:
+        return True
+
+
+set_config("MOZ_WMF_CDM", True, when=wmfcdm)
+set_define("MOZ_WMF_CDM", True, when=wmfcdm)
+
+
+option(
+    name="--enable-chrome-format",
+    help="Select FORMAT of chrome files during packaging.",
+    nargs=1,
+    choices=("omni", "jar", "flat"),
+    default="omni",
+)
+
+
+@depends("--enable-chrome-format")
+def packager_format(value):
+    return value[0]
+
+
+set_config("MOZ_PACKAGER_FORMAT", packager_format)
+
+# The packager minifies two different types of files: non-JS (mostly property
+# files for l10n), and JS.  Setting MOZ_PACKAGER_MINIFY only minifies the
+# former.  Firefox doesn't yet minify JS, due to concerns about debuggability.
+#
+# Also, the JS minification setup really only works correctly on Android:
+# we need extra setup to use the newly-built shell for Linux and Windows,
+# and cross-compilation for macOS requires some extra care.
+
+
+@depends(target_is_android, "--enable-debug", milestone.is_nightly)
+def enable_minify_default(is_android, debug, is_nightly):
+    if is_android and not debug and not is_nightly:
+        return ("properties", "js")
+    return ("properties",)
+
+
+option(
+    name="--enable-minify",
+    help="Select types of files to minify during packaging.",
+    nargs="*",
+    choices=("properties", "js"),
+    default=enable_minify_default,
+)
+
+
+@depends("--enable-minify")
+def enable_minify(value):
+    if "js" in value and "properties" not in value:
+        die("--enable-minify=js requires --enable-minify=properties.")
+    return namespace(
+        properties="properties" in value,
+        js="js" in value,
+    )
+
+
+set_config("MOZ_PACKAGER_MINIFY", True, when=enable_minify.properties)
+set_config("MOZ_PACKAGER_MINIFY_JS", True, when=enable_minify.js)
+
+
+@depends(host, build_project)
+def jar_maker_format(host, build_project):
+    # Multilocales for mobile/android use the same mergedirs for all locales,
+    # so we can't use symlinks for those builds.
+    if host.os == "WINNT" or build_project == "mobile/android":
+        return "flat"
+    return "symlink"
+
+
+set_config("MOZ_JAR_MAKER_FILE_FORMAT", jar_maker_format)
+
+
+@depends(toolkit)
+def omnijar_name(toolkit):
+    # Fennec's static resources live in the assets/ folder of the
+    # APK.  Adding a path to the name here works because we only
+    # have one omnijar file in the final package (which is not the
+    # case on desktop).
+    return "assets/omni.ja" if toolkit == "android" else "omni.ja"
+
+
+set_config("OMNIJAR_NAME", omnijar_name)
+
+project_flag("MOZ_PLACES", help="Build Places if required", set_as_define=True)
+
+project_flag(
+    "MOZ_SERVICES_HEALTHREPORT",
+    help="Build Firefox Health Reporter Service",
+    set_as_define=True,
+)
+
+project_flag(
+    "MOZ_NORMANDY",
+    help="Enable Normandy recipe runner",
+    set_as_define=True,
+)
+
+project_flag("MOZ_SERVICES_SYNC", help="Build Sync Services if required")
+
+project_flag(
+    "MOZ_ANDROID_HISTORY",
+    help="Enable Android History instead of Places",
+    set_as_define=True,
+)
+
+project_flag(
+    "MOZ_DEDICATED_PROFILES",
+    help="Enable dedicated profiles per install",
+    set_as_define=True,
+)
+
+project_flag(
+    "MOZ_BLOCK_PROFILE_DOWNGRADE",
+    help="Block users from starting profiles last used by a newer build",
+    set_as_define=True,
+)
+
+
+@depends("MOZ_PLACES", "MOZ_ANDROID_HISTORY")
+def check_places_and_android_history(places, android_history):
+    if places and android_history:
+        die("Cannot use MOZ_ANDROID_HISTORY alongside MOZ_PLACES.")
+
+
+option(
+    env="MOZ_TELEMETRY_REPORTING",
+    default=mozilla_official,
+    help="Enable telemetry reporting",
+)
+
+set_define("MOZ_TELEMETRY_REPORTING", True, when="MOZ_TELEMETRY_REPORTING")
+
+
+@depends("MOZ_TELEMETRY_REPORTING", milestone.is_nightly)
+def telemetry_on_by_default(reporting, is_nightly):
+    return reporting and is_nightly
+
+
+set_define("MOZ_TELEMETRY_ON_BY_DEFAULT", True, when=telemetry_on_by_default)
+
+
+# gpsd support
+# ==============================================================
+system_lib_option("--enable-gpsd", env="MOZ_GPSD", help="Enable gpsd support")
+
+
+@depends("--enable-gpsd")
+def gpsd(value):
+    return bool(value)
+
+
+system_gpsd = pkg_check_modules("MOZ_GPSD", "libgps >= 3.11", when=gpsd)
+
+set_config("MOZ_GPSD", depends_if(system_gpsd)(lambda _: True))
+
+# Miscellaneous programs
+# ==============================================================
+
+check_prog("TAR", ("gnutar", "gtar", "tar"))
+check_prog("UNZIP", ("unzip",))
+
+# Key files
+# ==============================================================
+include("../build/moz.configure/keyfiles.configure")
+
+simple_keyfile("Mozilla API")
+
+simple_keyfile("Google Location Service API")
+
+simple_keyfile("Google Safebrowsing API")
+
+id_and_secret_keyfile("Bing API")
+
+simple_keyfile("Adjust SDK")
+
+id_and_secret_keyfile("Leanplum SDK")
+
+simple_keyfile("Pocket API")
+
+
+# WebRender Debugger integration
+# ==============================================================
+
+option(
+    "--enable-webrender-debugger", help="Build the websocket debug server in WebRender"
+)
+
+set_config(
+    "MOZ_WEBRENDER_DEBUGGER", depends_if("--enable-webrender-debugger")(lambda _: True)
+)
+
+# Additional system headers defined at the application level
+# ==============================================================
+
+option(
+    "--enable-app-system-headers",
+    env="MOZ_APP_SYSTEM_HEADERS",
+    help="Use additional system headers defined in $MOZ_BUILD_APP/app-system-headers.mozbuild",
+)
+
+
+@depends("--enable-app-system-headers")
+def app_system_headers(value):
+    if value:
+        return True
+
+
+set_config("MOZ_APP_SYSTEM_HEADERS", app_system_headers)
+set_define("MOZ_APP_SYSTEM_HEADERS", app_system_headers)
+
+# Printing
+# ==============================================================
+option("--disable-printing", help="Disable printing support")
+
+
+@depends("--disable-printing")
+def printing(value):
+    if value:
+        return True
+
+
+set_config("NS_PRINTING", printing)
+set_define("NS_PRINTING", printing)
+set_define("NS_PRINT_PREVIEW", printing)
+
+# Speech-dispatcher support
+# ==============================================================
+@depends(toolkit)
+def no_speechd_on_non_gtk(toolkit):
+    if toolkit != "gtk":
+        return False
+
+
+imply_option(
+    "--enable-synth-speechd", no_speechd_on_non_gtk, reason="--enable-default-toolkit"
+)
+
+option("--disable-synth-speechd", help="Disable speech-dispatcher support")
+
+set_config("MOZ_SYNTH_SPEECHD", depends_if("--disable-synth-speechd")(lambda _: True))
+
+# Speech API
+# ==============================================================
+option("--disable-webspeech", help="Disable support for HTML Speech API")
+
+
+@depends("--disable-webspeech")
+def webspeech(value):
+    if value:
+        return True
+
+
+set_config("MOZ_WEBSPEECH", webspeech)
+set_define("MOZ_WEBSPEECH", webspeech)
+
+# Speech API test backend
+# ==============================================================
+option(
+    "--enable-webspeechtestbackend",
+    default=webspeech,
+    help="{Enable|Disable} support for HTML Speech API Test Backend",
+)
+
+
+@depends_if("--enable-webspeechtestbackend")
+def webspeech_test_backend(value):
+    return True
+
+
+set_config("MOZ_WEBSPEECH_TEST_BACKEND", webspeech_test_backend)
+set_define("MOZ_WEBSPEECH_TEST_BACKEND", webspeech_test_backend)
+
+# Graphics
+# ==============================================================
+@depends(target, milestone)
+def skia_pdf_default(target, milestone):
+    return milestone.is_nightly and target.os != "WINNT"
+
+
+option("--enable-skia-pdf", default=skia_pdf_default, help="{Enable|Disable} Skia PDF")
+
+set_config("MOZ_ENABLE_SKIA_PDF", True, when="--enable-skia-pdf")
+set_define("MOZ_ENABLE_SKIA_PDF", True, when="--enable-skia-pdf")
+
+set_config(
+    "SKIA_INCLUDES",
+    [
+        "/gfx/skia",
+        "/gfx/skia/skia",
+    ],
+)
+
+system_lib_option(
+    "--with-system-webp", help="Use system libwebp (located with pkgconfig)"
+)
+
+system_webp = pkg_check_modules(
+    "MOZ_WEBP", "libwebp >= 1.0.2 libwebpdemux >= 1.0.2", when="--with-system-webp"
+)
+
+set_config("MOZ_SYSTEM_WEBP", depends(when=system_webp)(lambda: True))
+
+# Build Freetype in the tree
+# ==============================================================
+@depends(target, "--enable-skia-pdf")
+def tree_freetype(target, skia_pdf):
+    if target.os == "Android" or (skia_pdf and target.os == "WINNT"):
+        return True
+
+
+set_define("MOZ_TREE_FREETYPE", tree_freetype)
+set_config("MOZ_TREE_FREETYPE", tree_freetype)
+
+set_define("HAVE_FT_BITMAP_SIZE_Y_PPEM", tree_freetype)
+set_define("HAVE_FT_GLYPHSLOT_EMBOLDEN", tree_freetype)
+set_define("HAVE_FT_LOAD_SFNT_TABLE", tree_freetype)
+
+
+@depends(freetype2_combined_info, tree_freetype, build_environment)
+def ft2_info(freetype2_combined_info, tree_freetype, build_env):
+    if tree_freetype:
+        return namespace(
+            cflags=("-I%s/modules/freetype2/include" % build_env.topsrcdir,), libs=()
+        )
+    if freetype2_combined_info:
+        return freetype2_combined_info
+
+
+set_config("FT2_LIBS", ft2_info.libs)
+
+
+@depends(target, tree_freetype, freetype2_info)
+def enable_cairo_ft(target, tree_freetype, freetype2_info):
+    # Avoid defining MOZ_ENABLE_CAIRO_FT on Windows platforms because
+    # "cairo-ft-font.c" includes <dlfcn.h>, which only exists on posix platforms
+    return freetype2_info or (tree_freetype and target.os != "WINNT")
+
+
+set_config("MOZ_ENABLE_CAIRO_FT", True, when=enable_cairo_ft)
+set_config("CAIRO_FT_CFLAGS", ft2_info.cflags, when=enable_cairo_ft)
+
+
+# WebDriver (HTTP / BiDi)
+# ==============================================================
+#
+# WebDriver is a remote control interface that enables introspection and
+# control of user agents. It provides a platform- and language-neutral wire
+# protocol as a way for out-of-process programs to remotely instruct the
+# behavior of web browsers.
+#
+# The Gecko implementation is backed by Marionette and Remote Agent.
+# Both protocols are not really toolkit features, as much as Gecko engine
+# features. But they are enabled based on the toolkit, so here it lives.
+#
+# Marionette remote protocol
+# -----------------------------------------------------------
+#
+# Marionette is the Gecko remote protocol used for various remote control,
+# automation, and testing purposes throughout Gecko-based applications like
+# Firefox, Thunderbird, and any mobile browser built upon GeckoView.
+#
+# It also backs ../testing/geckodriver, which is Mozilla's WebDriver
+# implementation.
+#
+# The source of Marionette lives in ../remote/marionette.
+#
+# For more information, see:
+# https://firefox-source-docs.mozilla.org/testing/marionette/index.html
+#
+# Remote Agent (WebDriver BiDi / partial CDP)
+# -----------------------------------------------------------
+#
+# The primary purpose is the implementation of the WebDriver BiDi specification.
+# But it also complements the existing Firefox Developer Tools Remote Debugging
+# Protocol (RDP) by implementing a subset of the Chrome DevTools Protocol (CDP).
+#
+# The source of Remote Agent lives in ../remote.
+#
+# For more information, see:
+# https://firefox-source-docs.mozilla.org/remote/index.html
+
+
+option(
+    "--disable-webdriver",
+    help="Disable support for WebDriver remote protocols",
+)
+
+
+@depends("--disable-webdriver")
+def webdriver(enabled):
+    if enabled:
+        return True
+
+
+set_config("ENABLE_WEBDRIVER", webdriver)
+set_define("ENABLE_WEBDRIVER", webdriver)
+
+
+# geckodriver WebDriver implementation
+# ==============================================================
+#
+# Turn off geckodriver for build configs we don't handle yet,
+# but allow --enable-geckodriver to override when compile environment is available.
+# --disable-tests implies disabling geckodriver.
+# Disable building in CI
+
+
+@depends(
+    "--enable-tests", target, cross_compiling, hazard_analysis, asan, "MOZ_AUTOMATION"
+)
+def geckodriver_default(enable_tests, target, cross_compile, hazard, asan, automation):
+    if not enable_tests:
+        return False
+    if hazard or target.os == "Android" or (asan and cross_compile):
+        return False
+    if automation:
+        return False
+    return True
+
+
+option(
+    "--enable-geckodriver",
+    default=geckodriver_default,
+    when="--enable-compile-environment",
+    help="{Build|Do not build} geckodriver",
+)
+
+
+@depends("--enable-geckodriver", when="--enable-compile-environment")
+def geckodriver(enabled):
+    if enabled:
+        return True
+
+
+set_config("MOZ_GECKODRIVER", geckodriver)
+
+
+# WebRTC
+# ========================================================
+@depends(target)
+def webrtc_default(target):
+    # Turn off webrtc for OS's we don't handle yet, but allow
+    # --enable-webrtc to override.
+    os_match = target.kernel in (
+        "Linux",
+        "WINNT",
+        "Darwin",
+        "DragonFly",
+        "FreeBSD",
+        "kFreeBSD",
+        "NetBSD",
+        "OpenBSD",
+    )
+
+    cpu_match = target.cpu in (
+        "x86_64",
+        "arm",
+        "aarch64",
+        "x86",
+        "ia64",
+        "mips32",
+        "mips64",
+        "ppc",
+        "ppc64",
+        "riscv64",
+    )
+
+    return os_match and cpu_match and target.endianness == "little"
+
+
+option(
+    "--disable-webrtc",
+    default=webrtc_default,
+    help="{Enable|Disable} support for WebRTC",
+)
+
+
+@depends("--disable-webrtc")
+def webrtc(enabled):
+    if enabled:
+        return True
+
+
+set_config("MOZ_WEBRTC", webrtc)
+set_define("MOZ_WEBRTC", webrtc)
+set_config("MOZ_SCTP", webrtc)
+set_define("MOZ_SCTP", webrtc)
+set_config("MOZ_SRTP", webrtc)
+set_define("MOZ_SRTP", webrtc)
+set_config("MOZ_WEBRTC_SIGNALING", webrtc)
+set_define("MOZ_WEBRTC_SIGNALING", webrtc)
+set_config("MOZ_PEERCONNECTION", webrtc)
+set_define("MOZ_PEERCONNECTION", webrtc)
+# MOZ_WEBRTC_ASSERT_ALWAYS turns on a number of safety asserts in
+# opt/production builds (via MOZ_CRASH())
+set_config("MOZ_WEBRTC_ASSERT_ALWAYS", webrtc)
+set_define("MOZ_WEBRTC_ASSERT_ALWAYS", webrtc)
+
+# RAW media
+# ==============================================================
+
+
+@depends(target, webrtc)
+def raw_media_default(target, webrtc):
+    if target.os == "Android":
+        return True
+    if webrtc:
+        return True
+
+
+option(
+    "--enable-raw",
+    default=raw_media_default,
+    help="{Enable|Disable} support for RAW media",
+)
+
+set_config("MOZ_RAW", depends_if("--enable-raw")(lambda _: True))
+set_define("MOZ_RAW", depends_if("--enable-raw")(lambda _: True))
+
+
+# X11
+# ==============================================================
+@depends(webrtc, when=toolkit_gtk)
+def x11_libs(webrtc):
+    libs = [
+        "x11",
+        "xcb",
+        "xcb-shm",
+        "x11-xcb",
+        "xext",
+        "xrandr >= 1.4.0",
+    ]
+    if webrtc:
+        # third_party/libwebrtc/webrtc/webrtc_gn/moz.build adds those
+        # manually, ensure they're available.
+        libs += [
+            "xcomposite",
+            "xcursor",
+            "xdamage",
+            "xfixes",
+            "xi",
+            "xtst",
+        ]
+    return libs
+
+
+x11_headers = pkg_check_modules(
+    "MOZ_X11",
+    x11_libs,
+    allow_missing=depends(full_toolkit)(lambda t: t == "cairo-gtk3-wayland"),
+    when=depends(full_toolkit)(
+        lambda t: t in ("cairo-gtk3", "cairo-gtk3-wayland", "cairo-gtk3-x11-wayland")
+    ),
+)
+
+
+set_config("MOZ_X11", True, when=x11_headers)
+set_define("MOZ_X11", True, when=x11_headers)
+
+pkg_check_modules(
+    "MOZ_X11_SM",
+    ["ice", "sm"],
+    cflags_only=True,
+    allow_missing=depends(full_toolkit)(lambda t: t == "cairo-gtk3-wayland"),
+    when=depends(full_toolkit)(
+        lambda t: t in ("cairo-gtk3", "cairo-gtk3-wayland", "cairo-gtk3-x11-wayland")
+    ),
+)
+
+
+# ASan Reporter Addon
+# ==============================================================
+option(
+    "--enable-address-sanitizer-reporter",
+    help="Enable Address Sanitizer Reporter Extension",
+)
+
+
+@depends("--enable-address-sanitizer-reporter")
+def enable_asan_reporter(value):
+    if value:
+        return True
+
+
+set_config("MOZ_ASAN_REPORTER", enable_asan_reporter)
+set_define("MOZ_ASAN_REPORTER", enable_asan_reporter)
+
+# Elfhack
+# ==============================================================
+with only_when("--enable-compile-environment"):
+
+    @depends(host, target)
+    def has_elfhack(host, target):
+        return (
+            target.kernel == "Linux"
+            and host.kernel == "Linux"
+            and target.cpu in ("arm", "aarch64", "x86", "x86_64")
+        )
+
+    @depends("--enable-release", enable_linker)
+    def default_elfhack(release, linker):
+        # Disable elfhack when explicitly building with --enable-linker=lld
+        if linker and linker.origin != "default" and linker[0] in ("lld", "mold"):
+            return False
+        return bool(release)
+
+    with only_when(has_elfhack):
+        option(
+            "--disable-elf-hack",
+            default=default_elfhack,
+            help="{Enable|Disable} elf hacks",
+        )
+
+        @depends(select_linker, when="--enable-elf-hack")
+        def use_elf_hack(linker):
+            if linker and linker.KIND == "lld":
+                die(
+                    "Cannot enable elfhack with lld."
+                    " Use --enable-linker=bfd, --enable-linker=gold, or --disable-elf-hack"
+                )
+            return True
+
+        set_config("USE_ELF_HACK", use_elf_hack)
+
+
+@depends(build_environment)
+def idl_roots(build_env):
+    return namespace(
+        ipdl_root=os.path.join(build_env.topobjdir, "ipc", "ipdl"),
+        webidl_root=os.path.join(build_env.topobjdir, "dom", "bindings"),
+        xpcom_root=os.path.join(build_env.topobjdir, "xpcom", "components"),
+    )
+
+
+set_config("WEBIDL_ROOT", idl_roots.webidl_root)
+set_config("IPDL_ROOT", idl_roots.ipdl_root)
+set_config("XPCOM_ROOT", idl_roots.xpcom_root)
+
+# Proxy bypass protection
+# ==============================================================
+
+option(
+    "--enable-proxy-bypass-protection",
+    help="Prevent suspected or confirmed proxy bypasses",
+)
+
+
+@depends_if("--enable-proxy-bypass-protection")
+def proxy_bypass_protection(_):
+    return True
+
+
+set_config("MOZ_PROXY_BYPASS_PROTECTION", proxy_bypass_protection)
+set_define("MOZ_PROXY_BYPASS_PROTECTION", proxy_bypass_protection)
+
+# Proxy direct failover
+# ==============================================================
+
+option(
+    "--disable-proxy-direct-failover",
+    help="Disable direct failover for system requests",
+)
+
+
+@depends_if("--disable-proxy-direct-failover")
+def proxy_direct_failover(value):
+    if value:
+        return True
+
+
+set_config("MOZ_PROXY_DIRECT_FAILOVER", proxy_direct_failover)
+set_define("MOZ_PROXY_DIRECT_FAILOVER", proxy_direct_failover)
+
+# MIDL
+# ==============================================================
+
+
+@depends(c_compiler, toolchain_prefix)
+def midl_names(c_compiler, toolchain_prefix):
+    if c_compiler and c_compiler.type in ["gcc", "clang"]:
+        # mingw
+        widl = ("widl",)
+        if toolchain_prefix:
+            prefixed = tuple("%s%s" % (p, "widl") for p in toolchain_prefix)
+            widl = prefixed + widl
+        return widl
+
+    return ("midl.exe",)
+
+
+@depends(target, "--enable-compile-environment")
+def check_for_midl(target, compile_environment):
+    if target.os != "WINNT":
+        return
+
+    if compile_environment:
+        return True
+
+
+midl = check_prog(
+    "MIDL",
+    midl_names,
+    when=check_for_midl,
+    allow_missing=True,
+    paths=sdk_bin_path,
+    # MIDL being used from a python wrapper script, we can live with it
+    # having spaces.
+    allow_spaces=True,
+)
+
+option(env="MIDL_FLAGS", nargs=1, help="Extra flags to pass to MIDL")
+
+
+@depends(
+    "MIDL_FLAGS",
+    target,
+    midl,
+    when=depends(midl, target)(lambda m, t: m and t.kernel == "WINNT"),
+)
+def midl_flags(flags, target, midl):
+    if flags:
+        flags = flags[0].split()
+    else:
+        flags = []
+
+    if not midl.endswith("widl"):
+        env = {
+            "x86": "win32",
+            "x86_64": "x64",
+            "aarch64": "arm64",
+        }[target.cpu]
+        return flags + ["-nologo", "-no_cpp", "-env", env]
+
+    # widl
+    return flags + {
+        "x86": ["--win32", "-m32"],
+        "x86_64": ["--win64", "-m64"],
+    }[target.cpu]
+
+
+set_config("MIDL_FLAGS", midl_flags)
+
+# Accessibility
+# ==============================================================
+
+option("--disable-accessibility", help="Disable accessibility support")
+
+
+@depends("--enable-accessibility", check_for_midl, midl, c_compiler)
+def accessibility(value, check_for_midl, midl, c_compiler):
+    enabled = bool(value)
+
+    if not enabled:
+        return
+
+    if check_for_midl and not midl:
+        if c_compiler and c_compiler.type in ("gcc", "clang"):
+            die(
+                "You have accessibility enabled, but widl could not be found. "
+                "Add --disable-accessibility to your mozconfig or install widl. "
+                "See https://developer.mozilla.org/en-US/docs/Cross_Compile_Mozilla_for_Mingw32 for details."
+            )
+        else:
+            die(
+                "MIDL could not be found. "
+                "Building accessibility without MIDL is not supported."
+            )
+
+    return enabled
+
+
+set_config("ACCESSIBILITY", accessibility)
+set_define("ACCESSIBILITY", accessibility)
+
+
+@depends(moz_debug, developer_options)
+def a11y_log(debug, developer_options):
+    return debug or developer_options
+
+
+set_config("A11Y_LOG", True, when=a11y_log)
+set_define("A11Y_LOG", True, when=a11y_log)
+
+
+# Addon signing
+# ==============================================================
+@depends(milestone)
+def require_signing(milestone):
+    return milestone.is_release_or_beta and not milestone.is_esr
+
+
+option(
+    env="MOZ_REQUIRE_SIGNING",
+    default=require_signing,
+    help="Enforce that add-ons are signed by the trusted root",
+)
+
+set_config("MOZ_REQUIRE_SIGNING", True, when="MOZ_REQUIRE_SIGNING")
+set_define("MOZ_REQUIRE_SIGNING", True, when="MOZ_REQUIRE_SIGNING")
+
+option(
+    "--with-unsigned-addon-scopes",
+    nargs="+",
+    choices=("app", "system"),
+    help="Addon scopes where signature is not required",
+)
+
+
+@depends("--with-unsigned-addon-scopes")
+def unsigned_addon_scopes(scopes):
+    return namespace(
+        app="app" in scopes or None,
+        system="system" in scopes or None,
+    )
+
+
+set_config("MOZ_UNSIGNED_APP_SCOPE", unsigned_addon_scopes.app)
+set_config("MOZ_UNSIGNED_SYSTEM_SCOPE", unsigned_addon_scopes.system)
+
+
+# Addon sideloading
+# ==============================================================
+option(
+    "--allow-addon-sideload",
+    default=milestone.is_esr,
+    help="Addon sideloading is allowed",
+)
+
+
+set_config("MOZ_ALLOW_ADDON_SIDELOAD", True, when="--allow-addon-sideload")
+
+# WebExtensions API WebIDL bindings
+# ==============================================================
+
+
+@depends(milestone)
+def extensions_webidl_bindings_default(milestone):
+    # Only enable the webidl bindings for the WebExtensions APIs
+    # in Nightly.
+    return milestone.is_nightly
+
+
+option(
+    "--enable-extensions-webidl-bindings",
+    default=extensions_webidl_bindings_default,
+    help="{Enable|Disable} building experimental WebExtensions WebIDL bindings",
+)
+
+
+@depends("--enable-extensions-webidl-bindings")
+def extensions_webidl_enabled(value):
+    return bool(value)
+
+
+set_config("MOZ_WEBEXT_WEBIDL_ENABLED", extensions_webidl_enabled)
+
+# Launcher process (Windows only)
+# ==============================================================
+
+
+@depends(target)
+def launcher_process_default(target):
+    return target.os == "WINNT"
+
+
+option(
+    "--enable-launcher-process",
+    default=launcher_process_default,
+    help="{Enable|Disable} launcher process by default",
+)
+
+
+@depends("--enable-launcher-process", target)
+def launcher(value, target):
+    enabled = bool(value)
+    if enabled and target.os != "WINNT":
+        die("Cannot enable launcher process on %s", target.os)
+    if enabled:
+        return True
+
+
+set_config("MOZ_LAUNCHER_PROCESS", launcher)
+set_define("MOZ_LAUNCHER_PROCESS", launcher)
+
+# llvm-dlltool (Windows only)
+# ==============================================================
+
+
+@depends(build_project, target, "--enable-compile-environment")
+def check_for_llvm_dlltool(build_project, target, compile_environment):
+    if build_project != "browser":
+        return
+
+    if target.os != "WINNT":
+        return
+
+    return compile_environment
+
+
+llvm_dlltool = check_prog(
+    "LLVM_DLLTOOL",
+    ("llvm-dlltool",),
+    what="llvm-dlltool",
+    when=check_for_llvm_dlltool,
+    paths=clang_search_path,
+)
+
+
+@depends(target, when=llvm_dlltool)
+def llvm_dlltool_flags(target):
+    arch = {
+        "x86": "i386",
+        "x86_64": "i386:x86-64",
+        "aarch64": "arm64",
+    }[target.cpu]
+
+    return ["-m", arch]
+
+
+set_config("LLVM_DLLTOOL_FLAGS", llvm_dlltool_flags)
+
+# BITS download (Windows only)
+# ==============================================================
+
+option(
+    "--enable-bits-download",
+    when=target_is_windows,
+    default=target_is_windows,
+    help="{Enable|Disable} building BITS download support",
+)
+
+set_define(
+    "MOZ_BITS_DOWNLOAD",
+    depends_if("--enable-bits-download", when=target_is_windows)(lambda _: True),
+)
+set_config(
+    "MOZ_BITS_DOWNLOAD",
+    depends_if("--enable-bits-download", when=target_is_windows)(lambda _: True),
+)
+
+# Bundled fonts on desktop platform
+# ==============================================================
+
+
+@depends(target)
+def bundled_fonts_default(target):
+    return target.os == "WINNT" or target.kernel == "Linux"
+
+
+@depends(build_project)
+def allow_bundled_fonts(project):
+    return project == "browser" or project == "comm/mail"
+
+
+option(
+    "--enable-bundled-fonts",
+    default=bundled_fonts_default,
+    when=allow_bundled_fonts,
+    help="{Enable|Disable} support for bundled fonts on desktop platforms",
+)
+
+set_define(
+    "MOZ_BUNDLED_FONTS",
+    depends_if("--enable-bundled-fonts", when=allow_bundled_fonts)(lambda _: True),
+)
+
+# Reflow counting
+# ==============================================================
+
+
+@depends(moz_debug)
+def reflow_perf(debug):
+    if debug:
+        return True
+
+
+option(
+    "--enable-reflow-perf",
+    default=reflow_perf,
+    help="{Enable|Disable} reflow performance tracing",
+)
+
+# The difference in conditions here comes from the initial implementation
+# in old-configure, which was unexplained there as well.
+set_define("MOZ_REFLOW_PERF", depends_if("--enable-reflow-perf")(lambda _: True))
+set_define("MOZ_REFLOW_PERF_DSP", reflow_perf)
+
+# Layout debugger
+# ==============================================================
+
+
+@depends(moz_debug)
+def layout_debugger(debug):
+    if debug:
+        return True
+
+
+option(
+    "--enable-layout-debugger",
+    default=layout_debugger,
+    help="{Enable|Disable} layout debugger",
+)
+
+set_config("MOZ_LAYOUT_DEBUGGER", True, when="--enable-layout-debugger")
+set_define("MOZ_LAYOUT_DEBUGGER", True, when="--enable-layout-debugger")
+
+
+# Shader Compiler for Windows (and MinGW Cross Compile)
+# ==============================================================
+
+with only_when(compile_environment):
+    fxc = check_prog(
+        "FXC",
+        ("fxc.exe", "fxc2.exe"),
+        when=depends(target)(lambda t: t.kernel == "WINNT"),
+        paths=sdk_bin_path,
+        # FXC being used from a python wrapper script, we can live with it
+        # having spaces.
+        allow_spaces=True,
+    )
+
+
+# VPX
+# ===
+
+with only_when(compile_environment):
+    system_lib_option(
+        "--with-system-libvpx", help="Use system libvpx (located with pkgconfig)"
+    )
+
+    with only_when("--with-system-libvpx"):
+        vpx = pkg_check_modules("MOZ_LIBVPX", "vpx >= 1.10.0")
+
+        check_header(
+            "vpx/vpx_decoder.h",
+            flags=vpx.cflags,
+            onerror=lambda: die(
+                "Couldn't find vpx/vpx_decoder.h, which is required to build "
+                "with system libvpx. Use --without-system-libvpx to build "
+                "with in-tree libvpx."
+            ),
+        )
+
+        check_symbol(
+            "vpx_codec_dec_init_ver",
+            flags=vpx.libs,
+            onerror=lambda: die(
+                "--with-system-libvpx requested but symbol vpx_codec_dec_init_ver "
+                "not found"
+            ),
+        )
+
+        set_config("MOZ_SYSTEM_LIBVPX", True)
+
+    @depends("--with-system-libvpx", target)
+    def in_tree_vpx(system_libvpx, target):
+        if system_libvpx:
+            return
+
+        arm_asm = (target.cpu == "arm") or None
+        return namespace(arm_asm=arm_asm)
+
+    @depends(target, when=in_tree_vpx)
+    def vpx_nasm(target):
+        if target.cpu in ("x86", "x86_64"):
+            if target.kernel == "WINNT":
+                # Version 2.03 is needed for automatic safeseh support.
+                return namespace(version="2.03", what="VPX")
+            return namespace(what="VPX")
+
+    @depends(in_tree_vpx, vpx_nasm, target, neon_flags)
+    def vpx_as_flags(vpx, vpx_nasm, target, neon_flags):
+        if vpx and vpx.arm_asm:
+            # These flags are a lie; they're just used to enable the requisite
+            # opcodes; actual arch detection is done at runtime.
+            return neon_flags
+        elif vpx and vpx_nasm and target.os != "WINNT" and target.cpu != "x86_64":
+            return ("-DPIC",)
+
+    set_config("VPX_USE_NASM", True, when=vpx_nasm)
+    set_config("VPX_ASFLAGS", vpx_as_flags)
+
+
+# JPEG
+# ====
+
+with only_when(compile_environment):
+    system_lib_option(
+        "--with-system-jpeg",
+        nargs="?",
+        help="Use system libjpeg (installed at given prefix)",
+    )
+
+    @depends_if("--with-system-jpeg")
+    def jpeg_flags(value):
+        if len(value):
+            return namespace(
+                cflags=("-I%s/include" % value[0],),
+                ldflags=("-L%s/lib" % value[0], "-ljpeg"),
+            )
+        return namespace(
+            ldflags=("-ljpeg",),
+        )
+
+    with only_when("--with-system-jpeg"):
+        check_symbol(
+            "jpeg_destroy_compress",
+            flags=jpeg_flags.ldflags,
+            onerror=lambda: die(
+                "--with-system-jpeg requested but symbol "
+                "jpeg_destroy_compress not found."
+            ),
+        )
+
+        c_compiler.try_compile(
+            includes=[
+                "stdio.h",
+                "sys/types.h",
+                "jpeglib.h",
+            ],
+            body="""
+                #if JPEG_LIB_VERSION < 62
+                #error Insufficient JPEG library version
+                #endif
+            """,
+            flags=jpeg_flags.cflags,
+            check_msg="for sufficient jpeg library version",
+            onerror=lambda: die(
+                "Insufficient JPEG library version for "
+                "--with-system-jpeg (62 required)"
+            ),
+        )
+
+        c_compiler.try_compile(
+            includes=[
+                "stdio.h",
+                "sys/types.h",
+                "jpeglib.h",
+            ],
+            body="""
+                #ifndef JCS_EXTENSIONS
+                #error libjpeg-turbo JCS_EXTENSIONS required
+                #endif
+            """,
+            flags=jpeg_flags.cflags,
+            check_msg="for sufficient libjpeg-turbo JCS_EXTENSIONS",
+            onerror=lambda: die(
+                "libjpeg-turbo JCS_EXTENSIONS required for " "--with-system-jpeg"
+            ),
+        )
+
+        set_config("MOZ_JPEG_CFLAGS", jpeg_flags.cflags)
+        set_config("MOZ_JPEG_LIBS", jpeg_flags.ldflags)
+
+    @depends("--with-system-jpeg", target, neon_flags)
+    def in_tree_jpeg_arm(system_jpeg, target, neon_flags):
+        if system_jpeg:
+            return
+
+        if target.cpu == "arm":
+            return neon_flags
+        elif target.cpu == "aarch64":
+            return ("-march=armv8-a",)
+
+    @depends("--with-system-jpeg", target)
+    def in_tree_jpeg_mips64(system_jpeg, target):
+        if system_jpeg:
+            return
+
+        if target.cpu == "mips64":
+            return ("-Wa,-mloongson-mmi", "-mloongson-ext")
+
+    # Compiler check from https://github.com/libjpeg-turbo/libjpeg-turbo/blob/57ba02a408a9a55ccff25aae8b164632a3a4f177/simd/CMakeLists.txt#L419
+    jpeg_mips64_mmi = c_compiler.try_compile(
+        body='int c = 0, a = 0, b = 0; asm("paddb %0, %1, %2" : "=f" (c) : "f" (a), "f" (b));',
+        check_msg="for loongson mmi support",
+        flags=in_tree_jpeg_mips64,
+        when=in_tree_jpeg_mips64,
+    )
+
+    @depends(
+        "--with-system-jpeg",
+        target,
+        in_tree_jpeg_arm,
+        in_tree_jpeg_mips64,
+        jpeg_mips64_mmi,
+    )
+    def in_tree_jpeg(
+        system_jpeg, target, in_tree_jpeg_arm, in_tree_jpeg_mips64, jpeg_mips64_mmi
+    ):
+        if system_jpeg:
+            return
+
+        if target.cpu in ("arm", "aarch64"):
+            return in_tree_jpeg_arm
+        elif target.kernel == "Darwin":
+            if target.cpu == "x86":
+                return ("-DPIC", "-DMACHO")
+            elif target.cpu == "x86_64":
+                return ("-D__x86_64__", "-DPIC", "-DMACHO")
+        elif target.kernel == "WINNT":
+            if target.cpu == "x86":
+                return ("-DPIC", "-DWIN32")
+            elif target.cpu == "x86_64":
+                return ("-D__x86_64__", "-DPIC", "-DWIN64", "-DMSVC")
+        elif target.cpu == "mips32":
+            return ("-mdspr2",)
+        elif target.cpu == "mips64" and jpeg_mips64_mmi:
+            return in_tree_jpeg_mips64
+        elif target.cpu == "x86":
+            return ("-DPIC", "-DELF")
+        elif target.cpu == "x86_64":
+            return ("-D__x86_64__", "-DPIC", "-DELF")
+
+    @depends(target, when=depends("--with-system-jpeg")(lambda x: not x))
+    def jpeg_nasm(target):
+        if target.cpu in ("x86", "x86_64"):
+            # libjpeg-turbo 2.0.6 requires nasm 2.10.
+            return namespace(version="2.10", what="JPEG")
+
+    # Compiler checks from https://github.com/libjpeg-turbo/libjpeg-turbo/blob/57ba02a408a9a55ccff25aae8b164632a3a4f177/simd/CMakeLists.txt#L258
+    jpeg_arm_neon_vld1_s16_x3 = c_compiler.try_compile(
+        includes=["arm_neon.h"],
+        body="int16_t input[12] = {}; int16x4x3_t output = vld1_s16_x3(input);",
+        check_msg="for vld1_s16_x3 in arm_neon.h",
+        flags=in_tree_jpeg_arm,
+        when=in_tree_jpeg_arm,
+    )
+
+    jpeg_arm_neon_vld1_u16_x2 = c_compiler.try_compile(
+        includes=["arm_neon.h"],
+        body="uint16_t input[8] = {}; uint16x4x2_t output = vld1_u16_x2(input);",
+        check_msg="for vld1_u16_x2 in arm_neon.h",
+        flags=in_tree_jpeg_arm,
+        when=in_tree_jpeg_arm,
+    )
+
+    jpeg_arm_neon_vld1q_u8_x4 = c_compiler.try_compile(
+        includes=["arm_neon.h"],
+        body="uint8_t input[64] = {}; uint8x16x4_t output = vld1q_u8_x4(input);",
+        check_msg="for vld1q_u8_x4 in arm_neon.h",
+        flags=in_tree_jpeg_arm,
+        when=in_tree_jpeg_arm,
+    )
+
+    set_config("LIBJPEG_TURBO_USE_NASM", True, when=jpeg_nasm)
+    set_config("LIBJPEG_TURBO_SIMD_FLAGS", in_tree_jpeg)
+    set_config("LIBJPEG_TURBO_HAVE_VLD1_S16_X3", jpeg_arm_neon_vld1_s16_x3)
+    set_config("LIBJPEG_TURBO_HAVE_VLD1_U16_X2", jpeg_arm_neon_vld1_u16_x2)
+    set_config("LIBJPEG_TURBO_HAVE_VLD1Q_U8_X4", jpeg_arm_neon_vld1q_u8_x4)
+    set_config(
+        "LIBJPEG_TURBO_NEON_INTRINSICS",
+        jpeg_arm_neon_vld1_s16_x3
+        & jpeg_arm_neon_vld1_u16_x2
+        & jpeg_arm_neon_vld1q_u8_x4,
+    )
+
+
+# PNG
+# ===
+with only_when(compile_environment):
+    system_lib_option(
+        "--with-system-png",
+        nargs="?",
+        help="Use system libpng",
+    )
+
+    @depends("--with-system-png")
+    def deprecated_system_png_path(value):
+        if len(value) == 1:
+            die(
+                "--with-system-png=PATH is not supported anymore. Please use "
+                "--with-system-png and set any necessary pkg-config environment variable."
+            )
+
+    png = pkg_check_modules("MOZ_PNG", "libpng >= 1.6.35", when="--with-system-png")
+
+    check_symbol(
+        "png_get_acTL",
+        flags=png.libs,
+        onerror=lambda: die(
+            "--with-system-png won't work because the system's libpng doesn't have APNG support"
+        ),
+        when="--with-system-png",
+    )
+
+    set_config("MOZ_SYSTEM_PNG", True, when="--with-system-png")
+
+
+# FFmpeg's ffvpx configuration
+# ==============================================================
+with only_when(compile_environment):
+
+    @depends(target)
+    def libav_fft(target):
+        if target.os == "Android" and target.cpu != "arm":
+            return True
+        return target.kernel in ("WINNT", "Darwin") or target.cpu == "x86_64"
+
+    set_config("MOZ_LIBAV_FFT", depends(when=libav_fft)(lambda: True))
+    set_define("MOZ_LIBAV_FFT", depends(when=libav_fft)(lambda: True))
+
+
+# Artifact builds need MOZ_FFVPX defined as if compilation happened.
+with only_when(compile_environment | artifact_builds):
+
+    @depends(target)
+    def ffvpx(target):
+        enable = use_nasm = True
+        flac_only = False
+        flags = []
+
+        if target.kernel == "WINNT":
+            if target.cpu == "x86":
+                # 32-bit windows need to prefix symbols with an underscore.
+                flags = ["-DPIC", "-DWIN32", "-DPREFIX", "-Pconfig_win32.asm"]
+            elif target.cpu == "x86_64":
+                flags = [
+                    "-D__x86_64__",
+                    "-DPIC",
+                    "-DWIN64",
+                    "-DMSVC",
+                    "-Pconfig_win64.asm",
+                ]
+            elif target.cpu == "aarch64":
+                flags = ["-DPIC", "-DWIN64"]
+                use_nasm = False
+        elif target.kernel == "Darwin":
+            # 32/64-bit macosx assemblers need to prefix symbols with an
+            # underscore.
+            flags = ["-DPIC", "-DMACHO", "-DPREFIX"]
+            if target.cpu == "x86_64":
+                flags += [
+                    "-D__x86_64__",
+                    "-Pconfig_darwin64.asm",
+                ]
+            elif target.cpu == "aarch64":
+                use_nasm = False
+        elif target.cpu == "x86_64":
+            flags = ["-D__x86_64__", "-DPIC", "-DELF", "-Pconfig_unix64.asm"]
+        elif target.cpu in ("x86", "arm", "aarch64"):
+            flac_only = True
+        else:
+            enable = False
+
+        if flac_only or not enable:
+            use_nasm = False
+
+        return namespace(
+            enable=enable,
+            use_nasm=use_nasm,
+            flac_only=flac_only,
+            flags=flags,
+        )
+
+    @depends(when=ffvpx.use_nasm)
+    def ffvpx_nasm():
+        # nasm 2.10 for AVX-2 support.
+        return namespace(version="2.10", what="FFVPX")
+
+    # ffvpx_nasm can't indirectly depend on vpx_as_flags, because it depends
+    # on a compiler test, so we have to do a little bit of dance here.
+    @depends(ffvpx, vpx_as_flags, target)
+    def ffvpx(ffvpx, vpx_as_flags, target):
+        if ffvpx and vpx_as_flags and target.cpu in ("arm", "aarch64"):
+            ffvpx.flags.extend(vpx_as_flags)
+        return ffvpx
+
+    set_config("MOZ_FFVPX", True, when=ffvpx.enable)
+    set_define("MOZ_FFVPX", True, when=ffvpx.enable)
+    set_config("MOZ_FFVPX_AUDIOONLY", True, when=ffvpx.flac_only)
+    set_define("MOZ_FFVPX_AUDIOONLY", True, when=ffvpx.flac_only)
+    set_config("FFVPX_ASFLAGS", ffvpx.flags)
+    set_config("FFVPX_USE_NASM", True, when=ffvpx.use_nasm)
+
+
+# nasm detection
+# ==============================================================
+@depends(dav1d_nasm, vpx_nasm, jpeg_nasm, ffvpx_nasm, when=compile_environment)
+def need_nasm(*requirements):
+    requires = {
+        x.what: x.version if hasattr(x, "version") else True for x in requirements if x
+    }
+    if requires:
+        items = sorted(requires.keys())
+        if len(items) > 1:
+            what = " and ".join((", ".join(items[:-1]), items[-1]))
+        else:
+            what = items[0]
+        versioned = {k: v for (k, v) in requires.items() if v is not True}
+        return namespace(what=what, versioned=versioned)
+
+
+nasm = check_prog(
+    "NASM",
+    ["nasm"],
+    allow_missing=True,
+    bootstrap="nasm",
+    when=need_nasm,
+)
+
+
+@depends(nasm, need_nasm.what)
+def check_nasm(nasm, what):
+    if not nasm and what:
+        die("Nasm is required to build with %s, but it was not found." % what)
+    return nasm
+
+
+@depends_if(check_nasm)
+@checking("nasm version")
+def nasm_version(nasm):
+    version = (
+        check_cmd_output(nasm, "-v", onerror=lambda: die("Failed to get nasm version."))
+        .splitlines()[0]
+        .split()[2]
+    )
+    return Version(version)
+
+
+@depends(nasm_version, need_nasm.versioned, when=need_nasm.versioned)
+def check_nasm_version(nasm_version, versioned):
+    by_version = sorted(versioned.items(), key=lambda x: x[1])
+    what, version = by_version[-1]
+    if nasm_version < version:
+        die(
+            "Nasm version %s or greater is required to build with %s." % (version, what)
+        )
+    return nasm_version
+
+
+@depends(target, when=check_nasm_version)
+def nasm_asflags(target):
+    asflags = {
+        ("OSX", "x86"): ["-f", "macho32"],
+        ("OSX", "x86_64"): ["-f", "macho64"],
+        ("WINNT", "x86"): ["-f", "win32"],
+        ("WINNT", "x86_64"): ["-f", "win64"],
+    }.get((target.os, target.cpu), None)
+    if asflags is None:
+        # We're assuming every x86 platform we support that's
+        # not Windows or Mac is ELF.
+        if target.cpu == "x86":
+            asflags = ["-f", "elf32"]
+        elif target.cpu == "x86_64":
+            asflags = ["-f", "elf64"]
+    return asflags
+
+
+set_config("NASM_ASFLAGS", nasm_asflags)
+
+
+# ANGLE OpenGL->D3D translator for WebGL
+# ==============================================================
+
+with only_when(compile_environment & target_is_windows):
+
+    def d3d_compiler_dll_result(value):
+        if not value.path:
+            return "provided by the OS"
+        return value.path
+
+    @depends(target, valid_windows_sdk_dir, fxc)
+    @checking("for D3D compiler DLL", d3d_compiler_dll_result)
+    @imports("os.path")
+    def d3d_compiler_dll(target, windows_sdk_dir, fxc):
+        suffix = {
+            "x86_64": "x64",
+        }.get(target.cpu, target.cpu)
+
+        name = "d3dcompiler_47.dll"
+
+        if target.cpu == "aarch64":
+            # AArch64 Windows comes with d3dcompiler_47.dll installed
+            return namespace(name=name, path=None)
+
+        if windows_sdk_dir:
+            path = os.path.join(windows_sdk_dir.path, "Redist", "D3D", suffix, name)
+            error_extra = "in Windows SDK at {}".format(windows_sdk_dir.path)
+        else:
+            path = os.path.join(os.path.dirname(fxc), name)
+            error_extra = "alongside FXC at {}".format(fxc)
+
+        if os.path.exists(path):
+            return namespace(name=name, path=path)
+        die("Could not find {} {}".format(name, error_extra))
+
+    set_config("MOZ_ANGLE_RENDERER", True)
+    set_config(
+        "MOZ_D3DCOMPILER_VISTA_DLL", d3d_compiler_dll.name, when=d3d_compiler_dll.path
+    )
+    set_config("MOZ_D3DCOMPILER_VISTA_DLL_PATH", d3d_compiler_dll.path)
+
+# Remoting protocol support
+# ==============================================================
+
+
+@depends(toolkit)
+def has_remote(toolkit):
+    if toolkit in ("gtk", "windows", "cocoa"):
+        return True
+
+
+set_config("MOZ_HAS_REMOTE", has_remote)
+set_define("MOZ_HAS_REMOTE", has_remote)
+
+# RLBox Library Sandboxing wasm support
+# ==============================================================
+
+
+def wasm_sandboxing_libraries():
+    return (
+        "graphite",
+        "ogg",
+        "hunspell",
+        "expat",
+        "woff2",
+    )
+
+
+@depends(dependable(wasm_sandboxing_libraries), build_project)
+def default_wasm_sandboxing_libraries(libraries, build_project):
+    if build_project != "tools/rusttests":
+        non_default_libs = set()
+
+        return tuple(l for l in libraries if l not in non_default_libs)
+
+
+option(
+    "--with-wasm-sandboxed-libraries",
+    env="WASM_SANDBOXED_LIBRARIES",
+    help="{Enable wasm sandboxing for the selected libraries|Disable wasm sandboxing}",
+    nargs="+",
+    choices=dependable(wasm_sandboxing_libraries),
+    default=default_wasm_sandboxing_libraries,
+)
+
+
+@depends("--with-wasm-sandboxed-libraries")
+def requires_wasm_sandboxing(libraries):
+    if libraries:
+        return True
+
+
+set_config("MOZ_USING_WASM_SANDBOXING", requires_wasm_sandboxing)
+set_define("MOZ_USING_WASM_SANDBOXING", requires_wasm_sandboxing)
+
+with only_when(requires_wasm_sandboxing & compile_environment):
+    option(
+        "--with-wasi-sysroot",
+        env="WASI_SYSROOT",
+        nargs=1,
+        help="Path to wasi sysroot for wasm sandboxing",
+    )
+
+    @depends("--with-wasi-sysroot", requires_wasm_sandboxing)
+    def bootstrap_wasi_sysroot(wasi_sysroot, requires_wasm_sandboxing):
+        return requires_wasm_sandboxing and not wasi_sysroot
+
+    @depends(
+        "--with-wasi-sysroot",
+        bootstrap_path("sysroot-wasm32-wasi", when=bootstrap_wasi_sysroot),
+    )
+    @imports("os")
+    def wasi_sysroot(wasi_sysroot, bootstrapped_sysroot):
+        if not wasi_sysroot:
+            return bootstrapped_sysroot
+
+        wasi_sysroot = wasi_sysroot[0]
+        if not os.path.isdir(wasi_sysroot):
+            die("Argument to --with-wasi-sysroot must be a directory")
+        if not os.path.isabs(wasi_sysroot):
+            die("Argument to --with-wasi-sysroot must be an absolute path")
+
+        return wasi_sysroot
+
+    @depends(wasi_sysroot)
+    def wasi_sysroot_flags(wasi_sysroot):
+        if wasi_sysroot:
+            log.info("Using wasi sysroot in %s", wasi_sysroot)
+            return ["--sysroot=%s" % wasi_sysroot]
+        return []
+
+    set_config("WASI_SYSROOT", wasi_sysroot)
+
+    def wasm_compiler_with_flags(compiler, sysroot_flags):
+        if compiler:
+            return (
+                compiler.wrapper + [compiler.compiler] + compiler.flags + sysroot_flags
+            )
+
+    @template
+    def wasm_compiler_error(msg):
+        @depends("--with-wasm-sandboxed-libraries")
+        def wasm_compiler_error(sandboxed_libs):
+            suggest_disable = ""
+            if sandboxed_libs.origin == "default":
+                suggest_disable = " Or build with --without-wasm-sandboxed-libraries."
+            return lambda: die(msg + suggest_disable)
+
+        return wasm_compiler_error
+
+    @template
+    def check_wasm_compiler(compiler, language):
+        compiler.try_compile(
+            includes=["cstring" if language == "C++" else "string.h"],
+            flags=wasi_sysroot_flags,
+            check_msg="the wasm %s compiler can find wasi headers" % language,
+            onerror=wasm_compiler_error(
+                "Cannot find wasi headers or problem with the wasm compiler. "
+                "Please fix the problem."
+            ),
+        )
+
+        compiler.try_run(
+            flags=wasi_sysroot_flags,
+            check_msg="the wasm %s linker can find wasi libraries" % language,
+            onerror=wasm_compiler_error(
+                "Cannot find wasi libraries or problem with the wasm linker. "
+                "Please fix the problem."
+            ),
+        )
+
+    wasm_cc = compiler("C", wasm, other_compiler=c_compiler)
+    check_wasm_compiler(wasm_cc, "C")
+
+    @depends(wasm_cc, wasi_sysroot_flags)
+    def wasm_cc_with_flags(wasm_cc, wasi_sysroot_flags):
+        return wasm_compiler_with_flags(wasm_cc, wasi_sysroot_flags)
+
+    set_config("WASM_CC", wasm_cc_with_flags)
+
+    wasm_cxx = compiler(
+        "C++",
+        wasm,
+        c_compiler=wasm_cc,
+        other_compiler=cxx_compiler,
+        other_c_compiler=c_compiler,
+    )
+    check_wasm_compiler(wasm_cxx, "C++")
+
+    @depends(wasm_cxx, wasi_sysroot_flags)
+    def wasm_cxx_with_flags(wasm_cxx, wasi_sysroot_flags):
+        return wasm_compiler_with_flags(wasm_cxx, wasi_sysroot_flags)
+
+    set_config("WASM_CXX", wasm_cxx_with_flags)
+
+    wasm_compile_flags = dependable(["-fno-exceptions", "-fno-strict-aliasing"])
+    option(env="WASM_CFLAGS", nargs=1, help="Options to pass to WASM_CC")
+
+    @depends("WASM_CFLAGS", wasm_compile_flags)
+    def wasm_cflags(value, wasm_compile_flags):
+        if value:
+            return wasm_compile_flags + value
+        else:
+            return wasm_compile_flags
+
+    set_config("WASM_CFLAGS", wasm_cflags)
+
+    option(env="WASM_CXXFLAGS", nargs=1, help="Options to pass to WASM_CXX")
+
+    @depends("WASM_CXXFLAGS", wasm_compile_flags)
+    def wasm_cxxflags(value, wasm_compile_flags):
+        if value:
+            return wasm_compile_flags + value
+        else:
+            return wasm_compile_flags
+
+    set_config("WASM_CXXFLAGS", wasm_cxxflags)
+
+
+@depends("--with-wasm-sandboxed-libraries")
+def wasm_sandboxing(libraries):
+    if not libraries:
+        return
+
+    return namespace(**{name: True for name in libraries})
+
+
+@template
+def wasm_sandboxing_config_defines():
+    for lib in wasm_sandboxing_libraries():
+        set_config(
+            "MOZ_WASM_SANDBOXING_%s" % lib.upper(), getattr(wasm_sandboxing, lib)
+        )
+        set_define(
+            "MOZ_WASM_SANDBOXING_%s" % lib.upper(), getattr(wasm_sandboxing, lib)
+        )
+
+
+wasm_sandboxing_config_defines()
+
+
+# new Notification Store implementation
+# ==============================================================
+
+
+@depends(milestone)
+def new_notification_store(milestone):
+    if milestone.is_nightly:
+        return True
+
+
+set_config("MOZ_NEW_NOTIFICATION_STORE", True, when=new_notification_store)
+set_define("MOZ_NEW_NOTIFICATION_STORE", True, when=new_notification_store)
+
+
+# Glean SDK Integration Crate
+# ==============================================================
+
+
+@depends(target)
+def glean_android(target):
+    return target.os == "Android"
+
+
+set_config("MOZ_GLEAN_ANDROID", True, when=glean_android)
+set_define("MOZ_GLEAN_ANDROID", True, when=glean_android)
+
+
+# dump_syms
+# ==============================================================
+
+check_prog(
+    "DUMP_SYMS",
+    ["dump_syms"],
+    allow_missing=True,
+    bootstrap="dump_syms",
+    when=compile_environment,
+)
+
+
+@depends(valid_windows_sdk_dir, host)
+@imports(_from="os", _import="environ")
+def pdbstr_paths(valid_windows_sdk_dir, host):
+    if not valid_windows_sdk_dir:
+        return
+
+    vc_host = {
+        "x86": "x86",
+        "x86_64": "x64",
+    }.get(host.cpu)
+
+    return [
+        environ["PATH"],
+        os.path.join(valid_windows_sdk_dir.path, "Debuggers", vc_host, "srcsrv"),
+    ]
+
+
+check_prog(
+    "PDBSTR",
+    ["pdbstr.exe"],
+    allow_missing=True,
+    when=compile_environment & target_is_windows,
+    paths=pdbstr_paths,
+    allow_spaces=True,
+)
+
+
+@depends("MOZ_AUTOMATION", c_compiler)
+def allow_missing_winchecksec(automation, c_compiler):
+    if not automation:
+        return True
+    if c_compiler and c_compiler.type != "clang-cl":
+        return True
+
+
+check_prog(
+    "WINCHECKSEC",
+    ["winchecksec.exe", "winchecksec"],
+    bootstrap="winchecksec",
+    allow_missing=allow_missing_winchecksec,
+    when=compile_environment & target_is_windows,
+)
+
+# Fork server
+@depends(target, build_project)
+def forkserver_default(target, build_project):
+    return build_project == "browser" and (
+        (target.os == "GNU" and target.kernel == "Linux")
+        or target.os == "FreeBSD"
+        or target.os == "OpenBSD"
+    )
+
+
+option(
+    "--enable-forkserver",
+    default=forkserver_default,
+    env="MOZ_ENABLE_FORKSERVER",
+    help="{Enable|Disable} fork server",
+)
+
+
+@depends("--enable-forkserver", target)
+def forkserver_flag(value, target):
+    if (
+        target.os == "Android"
+        or (target.os == "GNU" and target.kernel == "Linux")
+        or target.os == "FreeBSD"
+        or target.os == "OpenBSD"
+    ):
+        return bool(value)
+    pass
+
+
+set_config("MOZ_ENABLE_FORKSERVER", forkserver_flag)
+set_define("MOZ_ENABLE_FORKSERVER", forkserver_flag, forkserver_flag)
+
+# Crash Reporter
+# ==============================================================
+
+with only_when(compile_environment & target_has_linux_kernel):
+    # Check if we need to use the breakpad_getcontext fallback.
+    getcontext = check_symbol("getcontext")
+    set_config("HAVE_GETCONTEXT", getcontext)
+    set_define("HAVE_GETCONTEXT", getcontext)
+
+# NSS
+# ==============================================================
+include("../build/moz.configure/nss.configure")
+
+
+# Enable or disable running in background task mode: headless for
+# periodic, short-lived, maintenance tasks.
+# ==============================================================================
+option(
+    "--disable-backgroundtasks",
+    help="Disable running in background task mode",
+)
+set_config("MOZ_BACKGROUNDTASKS", True, when="--enable-backgroundtasks")
+set_define("MOZ_BACKGROUNDTASKS", True, when="--enable-backgroundtasks")
+
+
+# Update-related programs: updater, maintenance service, update agent,
+# default browser agent.
+# ==============================================================
+include("../build/moz.configure/update-programs.configure")
+
+
+# Mobile optimizations
+# ==============================================================
+option(
+    "--enable-mobile-optimize",
+    default=target_is_android,
+    help="{Enable|Disable} mobile optimizations",
+)
+
+set_define("MOZ_GFX_OPTIMIZE_MOBILE", True, when="--enable-mobile-optimize")
+# We ignore "paint will resample" on mobile for performance.
+# We may want to revisit this later.
+set_define("MOZ_IGNORE_PAINT_WILL_RESAMPLE", True, when="--enable-mobile-optimize")
+
+# Pref extensions
+# ==============================================================
+option("--disable-pref-extensions", help="Disable pref extensions such as autoconfig")
+set_config("MOZ_PREF_EXTENSIONS", True, when="--enable-pref-extensions")
+
+# Offer a way to disable the startup cache
+# ==============================================================
+option("--disable-startupcache", help="Disable startup cache")
+
+
+@depends("--enable-startupcache")
+def enable_startupcache(value):
+    if value:
+        return True
+
+
+set_define(
+    "MOZ_DISABLE_STARTUPCACHE", True, when=depends(enable_startupcache)(lambda x: not x)
+)
+
+
+# Branding
+# ==============================================================
+option(
+    env="MOZ_APP_REMOTINGNAME",
+    nargs=1,
+    help="Used for the internal program name, which affects profile name "
+    "and remoting. If not set, defaults to MOZ_APP_NAME if the update channel "
+    "is release, and MOZ_APP_NAME-MOZ_UPDATE_CHANNEL otherwise.",
+)
+
+
+@depends("MOZ_APP_REMOTINGNAME", moz_app_name, update_channel)
+def moz_app_remotingname(value, moz_app_name, update_channel):
+    if value:
+        return value[0]
+    if update_channel == "release":
+        return moz_app_name
+    return moz_app_name + "-" + update_channel
+
+
+set_config("MOZ_APP_REMOTINGNAME", moz_app_remotingname)
+
+option(
+    env="ANDROID_PACKAGE_NAME",
+    nargs=1,
+    help="Name of the Android package (default org.mozilla.$MOZ_APP_NAME)",
+)
+
+
+@depends("ANDROID_PACKAGE_NAME", moz_app_name)
+def android_package_name(value, moz_app_name):
+    if value:
+        return value[0]
+    if moz_app_name == "fennec":
+        return "org.mozilla.fennec_aurora"
+    return "org.mozilla.%s" % moz_app_name
+
+
+set_config("ANDROID_PACKAGE_NAME", android_package_name)
+
+
+# Miscellaneous options
+# ==============================================================
+option(env="MOZ_WINCONSOLE", nargs="?", help="Whether we can create a console window.")
+set_define("MOZ_WINCONSOLE", True, when=depends("MOZ_WINCONSOLE")(lambda x: x))
+
+
+# Alternative Crashreporter setting
+option(
+    "--with-crashreporter-url",
+    env="MOZ_CRASHREPORTER_URL",
+    default="https://crash-reports.mozilla.com/",
+    nargs=1,
+    help="Set an alternative crashreporter url",
+)
+
+set_config(
+    "MOZ_CRASHREPORTER_URL",
+    depends("--with-crashreporter-url")(lambda x: x[0].rstrip("/")),
+)
+
+
+# Crash reporter options
+# ==============================================================
+@depends(target)
+def oxidized_breakpad(target):
+    if target.kernel == "Linux" and target.os != "Android":
+        return target.cpu in ("x86", "x86_64")
+    return False
+
+
+set_config("MOZ_OXIDIZED_BREAKPAD", True, when=oxidized_breakpad)
+set_define("MOZ_OXIDIZED_BREAKPAD", True, when=oxidized_breakpad)
+
+
+# Wine
+# ==============================================================
+@depends(target, host)
+def want_wine(target, host):
+    return target.kernel == "WINNT" and host.kernel != "WINNT"
+
+
+wine = check_prog(
+    "WINE",
+    ["wine64", "wine"],
+    when=want_wine,
+    bootstrap="wine/bin",
+)
+
+# DOM Streams
+# ==============================================================
+# Set this to true so the JS engine knows we're doing a browser build.
+set_config("MOZ_DOM_STREAMS", True)
+set_define("MOZ_DOM_STREAMS", True)
+
+# libevent
+# ==============================================================
+with only_when(compile_environment):
+    system_lib_option(
+        "--with-system-libevent",
+        nargs="?",
+        help="Use system libevent",
+    )
+
+    @depends("--with-system-libevent")
+    def deprecated_system_libevent_path(value):
+        if len(value) == 1:
+            die(
+                "--with-system-libevent=PATH is not supported anymore. Please use "
+                "--with-system-libevent and set any necessary pkg-config environment variable."
+            )
+
+    pkg_check_modules("MOZ_LIBEVENT", "libevent", when="--with-system-libevent")
+
+    set_config("MOZ_SYSTEM_LIBEVENT", True, when="--with-system-libevent")
+
+
+# Crash reporting
+# ==============================================================
+@depends(target, developer_options, artifact_builds)
+def crashreporter_default(target, developer_options, artifacts):
+    if target.kernel in ("WINNT", "Darwin"):
+        return True
+    if target.kernel == "Linux" and target.cpu in ("x86", "x86_64", "arm", "aarch64"):
+        # The crash reporter prevents crash stacktraces to be logged in the
+        # logs on Android, so we leave it out by default in developer builds.
+        return target.os != "Android" or not developer_options or artifacts
+
+
+option(
+    "--enable-crashreporter",
+    default=crashreporter_default,
+    help="{Enable|Disable} crash reporting",
+)
+
+
+set_config("MOZ_CRASHREPORTER", True, when="--enable-crashreporter")
+set_define("MOZ_CRASHREPORTER", True, when="--enable-crashreporter")
+
+with only_when(compile_environment):
+    with only_when("--enable-crashreporter"):
+        pkg_check_modules(
+            "MOZ_GTHREAD",
+            "gthread-2.0",
+            when=depends(target)(lambda t: t.os == "GNU" and t.kernel == "Linux"),
+        )
+
+        set_config(
+            "MOZ_CRASHREPORTER_INJECTOR",
+            True,
+            when=depends(target)(lambda t: t.os == "WINNT" and t.bitness == 32),
+        )
+        set_define(
+            "MOZ_CRASHREPORTER_INJECTOR",
+            True,
+            when=depends(target)(lambda t: t.os == "WINNT" and t.bitness == 32),
+        )
+
+
+# If we have any service that uploads data (and requires data submission
+# policy alert), set MOZ_DATA_REPORTING.
+# ==============================================================
+@depends(
+    "MOZ_TELEMETRY_REPORTING",
+    "MOZ_SERVICES_HEALTHREPORT",
+    "--enable-crashreporter",
+    "MOZ_NORMANDY",
+)
+def data_reporting(telemetry, healthreport, crashreporter, normandy):
+    return telemetry or healthreport or crashreporter or normandy
+
+
+set_config("MOZ_DATA_REPORTING", True, when=data_reporting)
+set_define("MOZ_DATA_REPORTING", True, when=data_reporting)
+
+
+# Gtk+
+# ==============================================================
+with only_when(toolkit_gtk):
+    pkg_check_modules(
+        "MOZ_GTK3",
+        "gtk+-3.0 >= 3.14.0 gtk+-unix-print-3.0 glib-2.0 gobject-2.0 gio-unix-2.0",
+    )
+
+    set_define("GDK_VERSION_MIN_REQUIRED", "GDK_VERSION_3_14")
+    set_define("GDK_VERSION_MAX_ALLOWED", "GDK_VERSION_3_14")
+
+    pkg_check_modules("GLIB", "glib-2.0 >= 2.42 gobject-2.0")
+
+    set_define("GLIB_VERSION_MIN_REQUIRED", "GLIB_VERSION_2_42")
+    set_define("GLIB_VERSION_MAX_ALLOWED", "GLIB_VERSION_2_42")
+
+    set_define("MOZ_ACCESSIBILITY_ATK", True, when=accessibility)
+
+# DBus
+# ==============================================================
+with only_when(toolkit_gtk):
+    option("--disable-dbus", help="Disable dbus support")
+
+    with only_when("--enable-dbus"):
+        pkg_check_modules("MOZ_DBUS", "dbus-1 >= 0.60")
+        pkg_check_modules("MOZ_DBUS_GLIB", "dbus-glib-1 >= 0.60")
+
+        set_config("MOZ_ENABLE_DBUS", True)
+        set_define("MOZ_ENABLE_DBUS", True)
+
+
+# Necko's wifi scanner
+# ==============================================================
+@depends(target)
+def necko_wifi_when(target):
+    return target.os in ("WINNT", "OSX", "DragonFly", "FreeBSD") or (
+        target.kernel == "Linux" and target.os == "GNU"
+    )
+
+
+option("--disable-necko-wifi", help="Disable necko wifi scanner", when=necko_wifi_when)
+
+set_config("NECKO_WIFI", True, when="--enable-necko-wifi")
+set_define("NECKO_WIFI", True, when="--enable-necko-wifi")
+
+
+@depends(
+    depends("--enable-necko-wifi", when=necko_wifi_when)(lambda x: x),
+    depends("--enable-dbus", when=toolkit_gtk)(lambda x: x),
+    when=depends(target)(lambda t: t.os == "GNU" and t.kernel == "Linux"),
+)
+def necko_wifi_dbus(necko_wifi, dbus):
+    if necko_wifi and not dbus:
+        die(
+            "Necko WiFi scanning needs DBus on your platform, remove --disable-dbus"
+            " or use --disable-necko-wifi"
+        )
+    return necko_wifi and dbus
+
+
+set_config("NECKO_WIFI_DBUS", True, when=necko_wifi_dbus)
+set_define("NECKO_WIFI_DBUS", True, when=necko_wifi_dbus)
+
+
+# Frontend JS debug mode
+# ==============================================================
+option("--enable-debug-js-modules", help="Enable debug mode for frontend JS libraries")
+
+set_config("DEBUG_JS_MODULES", True, when="--enable-debug-js-modules")
+
+
+# moz_dump_painting
+# ==============================================================
+option("--enable-dump-painting", help="Enable paint debugging")
+
+set_define(
+    "MOZ_DUMP_PAINTING",
+    True,
+    when=depends("--enable-dump-painting", "--enable-debug")(
+        lambda painting, debug: painting or debug
+    ),
+)
+set_define("MOZ_LAYERS_HAVE_LOG", True, when="--enable-dump-painting")
+
+
+# libproxy support
+# ==============================================================
+with only_when(toolkit_gtk):
+    system_lib_option("--enable-libproxy", help="Enable libproxy support")
+
+    with only_when("--enable-libproxy"):
+        pkg_check_modules("MOZ_LIBPROXY", "libproxy-1.0")
+
+        set_config("MOZ_ENABLE_LIBPROXY", True)
+        set_define("MOZ_ENABLE_LIBPROXY", True)
+
+
+# Enable runtime logging
+# ==============================================================
+set_define("MOZ_LOGGING", True)
+set_define("FORCE_PR_LOG", True)
+
+# This will enable logging of addref, release, ctor, dtor.
+# ==============================================================
+option(
+    "--enable-logrefcnt",
+    default=moz_debug,
+    help="{Enable|Disable} logging of refcounts",
+)
+
+set_define("NS_BUILD_REFCNT_LOGGING", True, when="--enable-logrefcnt")
+
+
+# NegotiateAuth
+# ==============================================================
+option("--disable-negotiateauth", help="Disable GSS-API negotiation")
+
+set_config("MOZ_AUTH_EXTENSION", True, when="--enable-negotiateauth")
+set_define("MOZ_AUTH_EXTENSION", True, when="--enable-negotiateauth")
+
+
+# Parental control
+# ==============================================================
+option("--disable-parental-controls", help="Do not build parental controls")
+
+set_config(
+    "MOZ_DISABLE_PARENTAL_CONTROLS",
+    True,
+    when=depends("--enable-parental-controls")(lambda x: not x),
+)
+set_define(
+    "MOZ_DISABLE_PARENTAL_CONTROLS",
+    True,
+    when=depends("--enable-parental-controls")(lambda x: not x),
+)
+
+
+# Sandboxing support
+# ==============================================================
+@depends(target, tsan, asan)
+def sandbox_default(target, tsan, asan):
+    # Only enable the sandbox by default on Linux, OpenBSD, macOS, and Windows
+    if target.kernel == "Linux" and target.os == "GNU":
+        # Bug 1182565: TSan conflicts with sandboxing on Linux.
+        # Bug 1287971: LSan also conflicts with sandboxing on Linux.
+        if tsan or asan:
+            return False
+        # Linux sandbox is only available on x86{,_64} and arm{,64}.
+        return target.cpu in ("x86", "x86_64", "arm", "aarch64")
+    return target.kernel in ("WINNT", "Darwin", "OpenBSD")
+
+
+option(
+    "--enable-sandbox",
+    default=sandbox_default,
+    help="{Enable|Disable} sandboxing support",
+)
+
+set_config("MOZ_SANDBOX", True, when="--enable-sandbox")
+set_define("MOZ_SANDBOX", True, when="--enable-sandbox")
+
+with only_when(depends(target.kernel)(lambda k: k not in ("Darwin", "WINNT"))):
+    set_define("MOZ_CONTENT_TEMP_DIR", True, when="--enable-sandbox")
+
+# Searching of system directories for extensions.
+# ==============================================================
+# Note: this switch is meant to be used for test builds whose behavior should
+# not depend on what happens to be installed on the local machine.
+option(
+    "--disable-system-extension-dirs",
+    help="Disable searching system- and account-global directories for extensions"
+    " of any kind; use only profile-specific extension directories",
+)
+
+set_define("ENABLE_SYSTEM_EXTENSION_DIRS", True, when="--enable-system-extension-dirs")
+
+
+# Pixman
+# ==============================================================
+with only_when(compile_environment):
+    system_lib_option(
+        "--enable-system-pixman", help="Use system pixman (located with pkgconfig)"
+    )
+
+    @depends("--enable-system-pixman")
+    def in_tree_pixman(pixman):
+        return not pixman
+
+    set_config("MOZ_TREE_PIXMAN", True, when=in_tree_pixman)
+    set_define("MOZ_TREE_PIXMAN", True, when=in_tree_pixman)
+
+    pkg_check_modules("MOZ_PIXMAN", "pixman-1 >= 0.36.0", when="--enable-system-pixman")
+    # Set MOZ_PIXMAN_CFLAGS to an explicit empty value when --enable-system-pixman is *not* used,
+    # for layout/style/extra-bindgen-flags
+    set_config("MOZ_PIXMAN_CFLAGS", [], when=in_tree_pixman)
+
+
+# Universalchardet
+# ==============================================================
+with only_when(compile_environment):
+    option("--disable-universalchardet", help="Disable universal encoding detection")
+
+    set_config("MOZ_UNIVERSALCHARDET", True, when="--enable-universalchardet")
+
+
+# Disable zipwriter
+# ==============================================================
+with only_when(compile_environment):
+    option("--disable-zipwriter", help="Disable zipwriter component")
+
+    set_config("MOZ_ZIPWRITER", True, when="--enable-zipwriter")
+
+
+# Location of the mozilla user directory
+# ==============================================================
+with only_when(compile_environment):
+
+    @depends(target)
+    def default_user_appdir(target):
+        if target.kernel in ("WINNT", "Darwin"):
+            return "Mozilla"
+        return ".mozilla"
+
+    option(
+        "--with-user-appdir",
+        nargs=1,
+        default=default_user_appdir,
+        help="Set user-specific appdir",
+    )
+
+    @depends("--with-user-appdir")
+    def user_appdir(appdir):
+        if not appdir:
+            die("--without-user-appdir is not a valid option.")
+        if "/" in appdir[0]:
+            die("--with-user-appdir must be a single relative path.")
+        return '"{}"'.format(appdir[0])
+
+    set_define("MOZ_USER_DIR", user_appdir)
+
+
+# Check for sin_len and sin6_len - used by SCTP; only appears in Mac/*BSD generally
+# ==============================================================
+with only_when(compile_environment):
+    have_sin_len = c_compiler.try_compile(
+        includes=["netinet/in.h"],
+        body="struct sockaddr_in x; void *foo = (void*) &x.sin_len;",
+        check_msg="for sin_len in struct sockaddr_in",
+    )
+    have_sin6_len = c_compiler.try_compile(
+        includes=["netinet/in.h"],
+        body="struct sockaddr_in6 x; void *foo = (void*) &x.sin6_len;",
+        check_msg="for sin_len6 in struct sockaddr_in6",
+    )
+    set_define("HAVE_SIN_LEN", have_sin_len)
+    set_define("HAVE_SIN6_LEN", have_sin6_len)
+    # HAVE_CONN_LEN must be the same as HAVE_SIN_LEN and HAVE_SIN6_LEN
+    set_define("HAVE_SCONN_LEN", have_sin_len & have_sin6_len)
+    set_define(
+        "HAVE_SA_LEN",
+        c_compiler.try_compile(
+            includes=["netinet/in.h"],
+            body="struct sockaddr x; void *foo = (void*) &x.sa_len;",
+            check_msg="for sa_len in struct sockaddr",
+        ),
+    )
+
+
+# Check for pthread_cond_timedwait_monotonic_np
+# ==============================================================
+with only_when(compile_environment):
+    set_define(
+        "HAVE_PTHREAD_COND_TIMEDWAIT_MONOTONIC",
+        c_compiler.try_compile(
+            includes=["pthread.h"],
+            body="pthread_cond_timedwait_monotonic_np(0, 0, 0);",
+            # -Werror to catch any "implicit declaration" warning that means the function
+            # is not supported.
+            flags=["-Werror=implicit-function-declaration"],
+            check_msg="for pthread_cond_timedwait_monotonic_np",
+        ),
+    )
+
+
+# Custom dynamic linker for Android
+# ==============================================================
+with only_when(target_has_linux_kernel & compile_environment):
+    option(
+        env="MOZ_LINKER",
+        default=depends(target.os, when="--enable-jemalloc")(
+            lambda os: os == "Android"
+        ),
+        help="{Enable|Disable} custom dynamic linker",
+    )
+
+    set_config("MOZ_LINKER", True, when="MOZ_LINKER")
+    set_define("MOZ_LINKER", True, when="MOZ_LINKER")
+    add_old_configure_assignment("MOZ_LINKER", True, when="MOZ_LINKER")
+
+    moz_linker = depends(when="MOZ_LINKER")(lambda: True)
+
+
+# 32-bits ethtool_cmd.speed
+# ==============================================================
+with only_when(target_has_linux_kernel & compile_environment):
+    set_config(
+        "MOZ_WEBRTC_HAVE_ETHTOOL_SPEED_HI",
+        c_compiler.try_compile(
+            includes=["linux/ethtool.h"],
+            body="struct ethtool_cmd cmd; cmd.speed_hi = 0;",
+            check_msg="for 32-bits ethtool_cmd.speed",
+        ),
+    )
+
+# Gamepad support
+# ==============================================================
+check_header(
+    "linux/joystick.h",
+    onerror=lambda: die(
+        "Can't find header linux/joystick.h, needed for gamepad support."
+        " Please install Linux kernel headers."
+    ),
+    when=target_has_linux_kernel & compile_environment,
+)
+
+# Smart card support
+# ==============================================================
+@depends(build_project)
+def disable_smart_cards(build_project):
+    return build_project == "mobile/android"
+
+
+set_config("MOZ_NO_SMART_CARDS", True, when=disable_smart_cards)
+set_define("MOZ_NO_SMART_CARDS", True, when=disable_smart_cards)
+
+# Enable UniFFI fixtures
+# ==============================================================
+# These are used to test the uniffi-bindgen-gecko-js code generation.  They
+# should not be enabled in release builds.
+
+option(
+    "--enable-uniffi-fixtures",
+    help="Enable UniFFI Fixtures/Examples",
+)
+
+set_config("MOZ_UNIFFI_FIXTURES", True, when="--enable-uniffi-fixtures")
+
+# Checks for library functions
+# ==============================================================
+with only_when(compile_environment & depends(target.os)(lambda os: os != "WINNT")):
+    set_define("HAVE_STAT64", check_symbol("stat64"))
+    set_define("HAVE_LSTAT64", check_symbol("lstat64"))
+    set_define("HAVE_TRUNCATE64", check_symbol("truncate64"))
+    set_define("HAVE_STATVFS64", check_symbol("statvfs64"))
+    set_define("HAVE_STATVFS", check_symbol("statvfs"))
+    set_define("HAVE_STATFS64", check_symbol("statfs64"))
+    set_define("HAVE_STATFS", check_symbol("statfs"))
+    set_define("HAVE_LUTIMES", check_symbol("lutimes"))
+    set_define("HAVE_POSIX_FADVISE", check_symbol("posix_fadvise"))
+    set_define("HAVE_POSIX_FALLOCATE", check_symbol("posix_fallocate"))
+
+    set_define("HAVE_ARC4RANDOM", check_symbol("arc4random"))
+    set_define("HAVE_ARC4RANDOM_BUF", check_symbol("arc4random_buf"))
+    set_define("HAVE_MALLINFO", check_symbol("mallinfo"))
+
+# System policies
+# ==============================================================
+
+option(
+    "--disable-system-policies",
+    help="Disable reading policies from Windows registry, macOS's file system attributes, and /etc/firefox",
+)
+
+set_config("MOZ_SYSTEM_POLICIES", True, when="--enable-system-policies")
+
+# Allow disabling the creation a legacy profile
+# ==============================================================
+
+option(
+    "--disable-legacy-profile-creation",
+    help="Disable the creation a legacy profile, to be used by old versions "
+    "of Firefox, when no profiles exist.",
+)
+
+set_config("MOZ_CREATE_LEGACY_PROFILE", True, when="--enable-legacy-profile-creation")
+
+
+# STL wrapping
+# ==============================================================
+set_config("WRAP_STL_INCLUDES", True)
+set_config(
+    "STL_FLAGS",
+    depends(build_environment.dist)(lambda dist: [f"-I{dist}/stl_wrappers"]),
+)
+
+
+# Perl detection
+# ==============================================================
+@depends(target)
+def need_perl(target):
+    # Ideally, we'd also depend on gnu_as here, but that adds complications.
+    return target.cpu == "arm"
+
+
+perl = check_prog("PERL", ("perl5", "perl"), when=need_perl)
+
+
+@template
+def perl_version_check(min_version):
+    @depends(perl)
+    @checking("for minimum required perl version >= %s" % min_version)
+    def get_perl_version(perl):
+        return Version(
+            check_cmd_output(
+                perl,
+                "-e",
+                "print $]",
+                onerror=lambda: die("Failed to get perl version."),
+            )
+        )
+
+    @depends(get_perl_version)
+    def check_perl_version(version):
+        if version < min_version:
+            die("Perl %s or higher is required.", min_version)
+
+    @depends(perl)
+    @checking("for full perl installation")
+    @imports("subprocess")
+    def has_full_perl_installation(perl):
+        ret = subprocess.call([perl, "-e", "use Config; exit(!-d $Config{archlib})"])
+        return ret == 0
+
+    @depends(has_full_perl_installation)
+    def require_full_perl_installation(has_full_perl_installation):
+        if not has_full_perl_installation:
+            die(
+                "Cannot find Config.pm or $Config{archlib}. "
+                "A full perl installation is required."
+            )
+
+
+with only_when(need_perl):
+    perl_version_check("5.006")