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Diffstat (limited to 'build/moz.configure/toolchain.configure')
| -rw-r--r-- | build/moz.configure/toolchain.configure | 3290 |
1 files changed, 3290 insertions, 0 deletions
diff --git a/build/moz.configure/toolchain.configure b/build/moz.configure/toolchain.configure new file mode 100644 index 0000000000..a8ab8bd698 --- /dev/null +++ b/build/moz.configure/toolchain.configure @@ -0,0 +1,3290 @@ +# -*- 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/. + +# Code optimization +# ============================================================== + +option("--disable-optimize", nargs="?", help="Disable optimizations via compiler flags") + + +@depends("--enable-optimize") +def moz_optimize(option): + flags = None + + if len(option): + flags = option[0] + if "-O0" in flags: + val = None + else: + val = "2" + elif option: + val = "1" + else: + val = None + + return namespace( + optimize=val, + flags=flags, + ) + + +set_config("MOZ_OPTIMIZE", moz_optimize.optimize) +add_old_configure_assignment("MOZ_OPTIMIZE", moz_optimize.optimize) +add_old_configure_assignment("MOZ_CONFIGURE_OPTIMIZE_FLAGS", moz_optimize.flags) + +# Android NDK +# ============================================================== + + +@depends("--disable-compile-environment", target) +def compiling_android(compile_env, target): + return compile_env and target.os == "Android" + + +include("android-ndk.configure", when=compiling_android) + +with only_when(target_is_osx): + # MacOS deployment target version + # ============================================================== + # This needs to happen before any compilation test is done. + + option( + "--enable-macos-target", + env="MACOSX_DEPLOYMENT_TARGET", + nargs=1, + default=depends(target, developer_options) + # We continue to target 10.15 on Intel, but can target 11.0 for + # aarch64 since the earliest hardware was released alongside 11.0. + # For local builds, we want to target 10.15 regardless of the + # underlying platform to catch any errors or warnings that wouldn't + # show up when targeting 11.0, since these would later show up on + # CI for Intel builds. + (lambda t, d: "11.0" if (t.cpu == "aarch64" and not d) else "10.15"), + help="Set the minimum MacOS version needed at runtime{|}", + ) + + @depends_if("--enable-macos-target", developer_options) + def macos_target(value, _): + return value[0] + + +with only_when(host_is_osx | target_is_osx): + # MacOS SDK + # ========= + option( + "--with-macos-sdk", + env="MACOS_SDK_DIR", + nargs=1, + help="Location of platform SDK to use", + ) + + @imports("plistlib") + @imports(_from="__builtin__", _import="open") + @imports(_from="__builtin__", _import="Exception") + def get_sdk_version(sdk): + with open(os.path.join(sdk, "SDKSettings.plist"), "rb") as plist: + obj = plistlib.load(plist) + if not obj: + raise Exception( + "Error parsing SDKSettings.plist in the SDK directory: %s" % sdk + ) + if "Version" not in obj: + raise Exception( + "Error finding Version information in SDKSettings.plist from the SDK: %s" + % sdk + ) + return Version(obj["Version"]) + + def sdk_min_version(): + return "14.2" + + @depends( + "--with-macos-sdk", + host, + bootstrap_path( + "MacOSX{}.sdk".format(sdk_min_version()), + when=depends("--with-macos-sdk")(lambda x: not x), + allow_failure=True, + ), + ) + @imports(_from="__builtin__", _import="Exception") + @imports(_from="os.path", _import="isdir") + @imports(_from="os", _import="listdir") + def macos_sdk(sdk, host, bootstrapped): + if bootstrapped: + sdk = [bootstrapped] + if sdk: + sdk = sdk[0] + try: + version = get_sdk_version(sdk) + except Exception as e: + die(e) + elif host.os == "OSX": + sdk = check_cmd_output( + "xcrun", "--show-sdk-path", onerror=lambda: "" + ).rstrip() + if not sdk: + die( + "Could not find the macOS SDK. Please use --with-macos-sdk to give " + "the path to a macOS SDK." + ) + # Scan the parent directory xcrun returns for the most recent SDK. + sdk_dir = os.path.dirname(sdk) + versions = [] + for d in listdir(sdk_dir): + if d.lower().startswith("macos"): + try: + sdk = os.path.join(sdk_dir, d) + versions.append((get_sdk_version(sdk), sdk)) + except Exception: + pass + version, sdk = max(versions) + else: + die( + "Need a macOS SDK when targeting macOS. Please use --with-macos-sdk " + "to give the path to a macOS SDK." + ) + + if not isdir(sdk): + die( + "SDK not found in %s. When using --with-macos-sdk, you must specify a " + "valid SDK. SDKs are installed when the optional cross-development " + "tools are selected during the Xcode/Developer Tools installation." + % sdk + ) + if version < Version(sdk_min_version()): + die( + 'SDK version "%s" is too old. Please upgrade to at least %s. Try ' + "updating your system Xcode." % (version, sdk_min_version()) + ) + return sdk + + set_config("MACOS_SDK_DIR", macos_sdk) + + +with only_when(target_is_osx): + with only_when(cross_compiling): + option( + "--with-macos-private-frameworks", + env="MACOS_PRIVATE_FRAMEWORKS_DIR", + nargs=1, + help="Location of private frameworks to use", + ) + + @depends_if("--with-macos-private-frameworks") + @imports(_from="os.path", _import="isdir") + def macos_private_frameworks(value): + if value and not isdir(value[0]): + die( + "PrivateFrameworks not found not found in %s. When using " + "--with-macos-private-frameworks, you must specify a valid " + "directory", + value[0], + ) + return value[0] + + @depends(macos_private_frameworks, macos_sdk) + def macos_private_frameworks(value, sdk): + if value: + return value + return os.path.join(sdk or "/", "System/Library/PrivateFrameworks") + + set_config("MACOS_PRIVATE_FRAMEWORKS_DIR", macos_private_frameworks) + + +# GC rooting and hazard analysis. +# ============================================================== +option(env="MOZ_HAZARD", help="Build for the GC rooting hazard analysis") + + +@depends("MOZ_HAZARD") +def hazard_analysis(value): + if value: + return True + + +set_config("MOZ_HAZARD", hazard_analysis) + + +# Cross-compilation related things. +# ============================================================== +option( + "--with-toolchain-prefix", + env="TOOLCHAIN_PREFIX", + nargs=1, + help="Prefix for the target toolchain", +) + + +@depends("--with-toolchain-prefix", host, target, cross_compiling) +def toolchain_prefix(value, host, target, cross_compiling): + if value: + return tuple(value) + # We don't want a toolchain prefix by default when building on mac for mac. + if cross_compiling and not (target.os == "OSX" and host.os == "OSX"): + return ("%s-" % target.toolchain, "%s-" % target.alias) + + +@depends(toolchain_prefix, target) +def first_toolchain_prefix(toolchain_prefix, target): + # Pass TOOLCHAIN_PREFIX down to the build system if it was given from the + # command line/environment (in which case there's only one value in the tuple), + # or when cross-compiling for Android or OSX. + if toolchain_prefix and ( + target.os in ("Android", "OSX") or len(toolchain_prefix) == 1 + ): + return toolchain_prefix[0] + + +set_config("TOOLCHAIN_PREFIX", first_toolchain_prefix) +add_old_configure_assignment("TOOLCHAIN_PREFIX", first_toolchain_prefix) + + +# Compilers +# ============================================================== +include("compilers-util.configure") + + +def try_preprocess( + configure_cache, compiler, language, source, onerror=None, wrapper=[] +): + return try_invoke_compiler( + configure_cache, compiler, language, source, ["-E"], onerror, wrapper + ) + + +@imports(_from="mozbuild.configure.constants", _import="CompilerType") +@imports(_from="mozbuild.configure.constants", _import="CPU_preprocessor_checks") +@imports(_from="mozbuild.configure.constants", _import="kernel_preprocessor_checks") +@imports(_from="mozbuild.configure.constants", _import="OS_preprocessor_checks") +@imports(_from="textwrap", _import="dedent") +@imports(_from="__builtin__", _import="Exception") +def get_compiler_info(configure_cache, compiler, language): + """Returns information about the given `compiler` (command line in the + form of a list or tuple), in the given `language`. + + The returned information includes: + - the compiler type (clang-cl, clang or gcc) + - the compiler version + - the compiler supported language + - the compiler supported language version + """ + # Xcode clang versions are different from the underlying llvm version (they + # instead are aligned with the Xcode version). Fortunately, we can tell + # apart plain clang from Xcode clang, and convert the Xcode clang version + # into the more or less corresponding plain clang version. + check = dedent( + """\ + #if defined(_MSC_VER) && defined(__clang__) && defined(_MT) + %COMPILER "clang-cl" + %VERSION __clang_major__.__clang_minor__.__clang_patchlevel__ + #elif defined(__clang__) + %COMPILER "clang" + %VERSION __clang_major__.__clang_minor__.__clang_patchlevel__ + # ifdef __apple_build_version__ + %XCODE 1 + # endif + #elif defined(__GNUC__) && !defined(__MINGW32__) + %COMPILER "gcc" + %VERSION __GNUC__.__GNUC_MINOR__.__GNUC_PATCHLEVEL__ + #endif + + #if __cplusplus + %cplusplus __cplusplus + #elif __STDC_VERSION__ + %STDC_VERSION __STDC_VERSION__ + #endif + """ + ) + + # While we're doing some preprocessing, we might as well do some more + # preprocessor-based tests at the same time, to check the toolchain + # matches what we want. + for name, preprocessor_checks in ( + ("CPU", CPU_preprocessor_checks), + ("KERNEL", kernel_preprocessor_checks), + ("OS", OS_preprocessor_checks), + ): + for n, (value, condition) in enumerate(preprocessor_checks.items()): + check += dedent( + """\ + #%(if)s %(condition)s + %%%(name)s "%(value)s" + """ + % { + "if": "elif" if n else "if", + "condition": condition, + "name": name, + "value": value, + } + ) + check += "#endif\n" + + # Also check for endianness. The advantage of living in modern times is + # that all the modern compilers we support now have __BYTE_ORDER__ defined + # by the preprocessor. + check += dedent( + """\ + #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ + %ENDIANNESS "little" + #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ + %ENDIANNESS "big" + #endif + """ + ) + + result = try_preprocess(configure_cache, compiler, language, check) + + if not result: + raise FatalCheckError("Unknown compiler or compiler not supported.") + + # Metadata emitted by preprocessors such as GCC with LANG=ja_JP.utf-8 may + # have non-ASCII characters. Treat the output as bytearray. + data = {} + for line in result.splitlines(): + if line.startswith("%"): + k, _, v = line.partition(" ") + k = k.lstrip("%") + data[k] = v.replace(" ", "").lstrip('"').rstrip('"') + log.debug("%s = %s", k, data[k]) + + try: + type = CompilerType(data["COMPILER"]) + except Exception: + raise FatalCheckError("Unknown compiler or compiler not supported.") + + cplusplus = int(data.get("cplusplus", "0L").rstrip("L")) + stdc_version = int(data.get("STDC_VERSION", "0L").rstrip("L")) + + version = data.get("VERSION") + if version: + version = Version(version) + if data.get("XCODE"): + # Derived from https://en.wikipedia.org/wiki/Xcode#Toolchain_versions + # with enough granularity for major.minor version checks further + # down the line + if version < "9.1": + version = Version("4.0.0.or.less") + elif version < "10.0": + version = Version("5.0.2") + elif version < "10.0.1": + version = Version("6.0.1") + elif version < "11.0": + version = Version("7.0.0") + elif version < "11.0.3": + version = Version("8.0.0") + elif version < "12.0": + version = Version("9.0.0") + elif version < "12.0.5": + version = Version("10.0.0") + elif version < "13.0": + version = Version("11.1.0") + elif version < "13.0.1": + version = Version("12.0.0") + elif version < "14.0": + version = Version("13.0.0") + elif version < "15.0": + version = Version("14.0.0") + else: + version = Version("14.0.0.or.more") + + return namespace( + type=type, + version=version, + cpu=data.get("CPU"), + kernel=data.get("KERNEL"), + endianness=data.get("ENDIANNESS"), + os=data.get("OS"), + language="C++" if cplusplus else "C", + language_version=cplusplus if cplusplus else stdc_version, + xcode=bool(data.get("XCODE")), + ) + + +def same_arch_different_bits(): + return ( + ("x86", "x86_64"), + ("ppc", "ppc64"), + ("sparc", "sparc64"), + ) + + +@imports(_from="mozbuild.shellutil", _import="quote") +@imports(_from="mozbuild.configure.constants", _import="OS_preprocessor_checks") +def check_compiler(configure_cache, compiler, language, target, android_version): + info = get_compiler_info(configure_cache, compiler, language) + + flags = [] + + # Check language standards + # -------------------------------------------------------------------- + if language != info.language: + raise FatalCheckError( + "`%s` is not a %s compiler." % (quote(*compiler), language) + ) + + # Note: We do a strict version check because there sometimes are backwards + # incompatible changes in the standard, and not all code that compiles as + # C99 compiles as e.g. C11 (as of writing, this is true of libnestegg, for + # example) + if info.language == "C" and info.language_version != 199901: + if info.type == "clang-cl": + flags.append("-Xclang") + flags.append("-std=gnu99") + + cxx17_version = 201703 + if info.language == "C++": + if info.language_version != cxx17_version: + # MSVC headers include C++17 features, but don't guard them + # with appropriate checks. + if info.type == "clang-cl": + flags.append("-Xclang") + flags.append("-std=c++17") + else: + flags.append("-std=gnu++17") + + # Check compiler target + # -------------------------------------------------------------------- + has_target = False + if target.os == "Android" and android_version: + # This makes clang define __ANDROID_API__ and use versioned library + # directories from the NDK. + toolchain = "%s%d" % (target.toolchain, android_version) + else: + toolchain = target.toolchain + + if info.type == "clang": + # Add the target explicitly when the target is aarch64 macosx, because + # the Xcode clang target is named differently, and we need to work around + # https://github.com/rust-lang/rust-bindgen/issues/1871 and + # https://github.com/alexcrichton/cc-rs/issues/542 so we always want + # the target on the command line, even if the compiler would default to + # that. + if info.xcode and target.os == "OSX" and target.cpu == "aarch64": + if "--target=arm64-apple-darwin" not in compiler: + flags.append("--target=arm64-apple-darwin") + has_target = True + + elif ( + not info.kernel + or info.kernel != target.kernel + or not info.endianness + or info.endianness != target.endianness + ): + flags.append("--target=%s" % toolchain) + has_target = True + + # Add target flag when there is an OS mismatch (e.g. building for Android on + # Linux). However, only do this if the target OS is in our whitelist, to + # keep things the same on other platforms. + elif target.os in OS_preprocessor_checks and ( + not info.os or info.os != target.os + ): + flags.append("--target=%s" % toolchain) + has_target = True + + if not has_target and (not info.cpu or info.cpu != target.cpu): + same_arch = same_arch_different_bits() + if (target.cpu, info.cpu) in same_arch: + flags.append("-m32") + elif (info.cpu, target.cpu) in same_arch: + flags.append("-m64") + elif info.type == "clang-cl" and target.cpu == "aarch64": + flags.append("--target=%s" % toolchain) + elif info.type == "clang": + flags.append("--target=%s" % toolchain) + + return namespace( + type=info.type, + version=info.version, + target_cpu=info.cpu, + target_kernel=info.kernel, + target_endianness=info.endianness, + target_os=info.os, + flags=flags, + ) + + +@imports(_from="__builtin__", _import="open") +@imports("json") +@imports("os") +def get_vc_paths(topsrcdir): + def vswhere(args): + program_files = os.environ.get("PROGRAMFILES(X86)") or os.environ.get( + "PROGRAMFILES" + ) + if not program_files: + return [] + vswhere = os.path.join( + program_files, "Microsoft Visual Studio", "Installer", "vswhere.exe" + ) + if not os.path.exists(vswhere): + return [] + return json.loads(check_cmd_output(vswhere, "-format", "json", *args)) + + for install in vswhere( + [ + "-products", + "*", + "-requires", + "Microsoft.VisualStudio.Component.VC.Tools.x86.x64", + ] + ): + path = install["installationPath"] + tools_version = ( + open( + os.path.join( + path, r"VC\Auxiliary\Build\Microsoft.VCToolsVersion.default.txt" + ), + "r", + ) + .read() + .strip() + ) + tools_path = os.path.join(path, r"VC\Tools\MSVC", tools_version) + yield (Version(install["installationVersion"]), tools_path) + + +@depends(target, host) +def is_windows(target, host): + return host.kernel == "WINNT" or target.kernel == "WINNT" + + +# Calling this a sysroot is a little weird, but it's the terminology clang went +# with with its -winsysroot flag. +option( + env="WINSYSROOT", + nargs=1, + when=is_windows, + help='Path to a Windows "sysroot" (directory containing MSVC, SDKs)', +) + + +@depends( + "WINSYSROOT", + bootstrap_path( + "vs", + when=depends("WINSYSROOT", when=is_windows)(lambda x: not x), + ), + when=is_windows, +) +def winsysroot(winsysroot, bootstrapped): + if bootstrapped: + return bootstrapped + if winsysroot: + return winsysroot[0] + + +option( + env="VC_PATH", + nargs=1, + when=is_windows, + help="Path to the Microsoft Visual C/C++ compiler", +) + + +@depends( + host, + build_environment, + "VC_PATH", + winsysroot, + when=is_windows, +) +@imports("os") +@imports(_from="operator", _import="itemgetter") +def vc_compiler_paths_for_version(host, env, vc_path, winsysroot): + if winsysroot: + if vc_path: + die("WINSYSROOT and VC_PATH cannot be set together.") + base_vc_path = os.path.join(winsysroot, "VC", "Tools", "MSVC") + versions = os.listdir(base_vc_path) + vc_path = [os.path.join(base_vc_path, str(max(Version(v) for v in versions)))] + if vc_path: + # Use an arbitrary version, it doesn't matter. + all_versions = [(Version("15"), vc_path[0])] + elif host.kernel != "WINNT": + # Don't try to do anything when VC_PATH is not set on cross-compiles. + return + else: + all_versions = sorted(get_vc_paths(env.topsrcdir), key=itemgetter(0)) + if not all_versions: + return + # Choose the newest version. + path = all_versions[-1][1] + host_dir = { + "x86_64": "Hostx64", + "x86": "Hostx86", + }.get(host.cpu) + if host_dir: + path = os.path.join(path, "bin", host_dir) + return { + "x64": [os.path.join(path, "x64")], + # The cross toolchains require DLLs from the native x64 toolchain. + "x86": [os.path.join(path, "x86"), os.path.join(path, "x64")], + "arm64": [os.path.join(path, "arm64"), os.path.join(path, "x64")], + } + + +@depends(target, host, vc_compiler_paths_for_version, when=is_windows) +def vc_compiler_path(target, host, paths): + cpu = target.cpu if target.os == "WINNT" else host.cpu + vc_target = { + "x86": "x86", + "x86_64": "x64", + "arm": "arm", + "aarch64": "arm64", + }.get(cpu) + if not paths: + return + return paths.get(vc_target) + + +@depends(vc_compiler_path, original_path) +@imports("os") +@imports(_from="os", _import="environ") +def vc_toolchain_search_path(vc_compiler_path, original_path): + result = list(original_path) + + if vc_compiler_path: + # The second item, if there is one, is necessary to have in $PATH for + # Windows to load the required DLLs from there. + if len(vc_compiler_path) > 1: + environ["PATH"] = os.pathsep.join(result + vc_compiler_path[1:]) + + # The first item is where the programs are going to be + result.append(vc_compiler_path[0]) + + return result + + +@depends_if(vc_compiler_path, when=is_windows) +def vc_compiler_version(vc_compiler_path): + version = Version( + os.path.basename( + os.path.dirname(os.path.dirname(os.path.dirname(vc_compiler_path[0]))) + ) + ) + # MSVC path with version 14.x is actually version 19.x + if version.major == 14: + return Version(f"19.{version.minor}") + + +@depends_if(vc_compiler_version) +def is_vs2019_or_more(vc_compiler_version): + return vc_compiler_version >= Version("19.20") + + +add_old_configure_assignment("IS_VS2019_OR_MORE", is_vs2019_or_more) + + +@depends_if(vc_compiler_version) +def msvs_version(vc_compiler_version): + # clang-cl emulates the same version scheme as cl. And MSVS_VERSION needs to + # be set for GYP on Windows. + if vc_compiler_version >= Version("19.30"): + return "2022" + if vc_compiler_version >= Version("19.20"): + return "2019" + if vc_compiler_version >= Version("19.10"): + return "2017" + + return "" + + +set_config("MSVS_VERSION", msvs_version) + + +clang_search_path = bootstrap_search_path("clang/bin") + + +@depends( + bootstrap_search_path("rustc/bin", when="MOZ_AUTOMATION"), + bootstrap_search_path_order, + original_path, +) +@imports("os") +@imports(_from="os", _import="environ") +def rust_search_path(rust_path, search_order, original_path): + result = list(rust_path or original_path) + # Also add the rustup install directory for cargo/rustc. + cargo_home = environ.get("CARGO_HOME", "") + if cargo_home: + cargo_home = os.path.abspath(cargo_home) + else: + cargo_home = os.path.expanduser(os.path.join("~", ".cargo")) + rustup_path = os.path.join(cargo_home, "bin") + if search_order == "prepend": + result.insert(0, rustup_path) + else: + result.append(rustup_path) + return result + + +# Prepend the mozilla-build msys2 path, since otherwise we can get mismatched +# cygwin dll errors during configure if we get called from another msys2 +# environment, see bug 1801826. +@depends( + mozillabuild_bin_paths, clang_search_path, rust_search_path, target, original_path +) +@imports("os") +def altered_path( + mozillabuild_bin_paths, clang_search_path, rust_search_path, target, original_path +): + altered_path = mozillabuild_bin_paths + if target.kernel == "Darwin": + # The rust compiler wants to execute dsymutil, but it does so in a + # non-configurable way (https://github.com/rust-lang/rust/issues/52728) + # so we add the clang path. + path = clang_search_path + else: + path = original_path + # cargo needs the rust search path to find cargo-$subcommand. + path += rust_search_path + for p in path: + if p not in altered_path: + altered_path.append(p) + return os.pathsep.join(altered_path) + + +set_config("PATH", altered_path) + + +# Compiler wrappers +# ============================================================== +option( + "--with-compiler-wrapper", + env="COMPILER_WRAPPER", + nargs=1, + help="Enable compiling with wrappers such as distcc and ccache", +) + +option("--with-ccache", env="CCACHE", nargs="?", help="Enable compiling with ccache") + + +@depends_if("--with-ccache") +def ccache(value): + if len(value): + return value + # If --with-ccache was given without an explicit value, we default to + # 'ccache'. + return "ccache" + + +ccache = check_prog( + "CCACHE", + progs=(), + input=ccache, + paths=bootstrap_search_path( + "sccache", when=depends("CCACHE")(lambda c: len(c) and c[0] == "sccache") + ), + allow_missing=True, +) + +option(env="CCACHE_PREFIX", nargs=1, help="Compiler prefix to use when using ccache") + +ccache_prefix = depends_if("CCACHE_PREFIX")(lambda prefix: prefix[0]) +set_config("CCACHE_PREFIX", ccache_prefix) + +# Distinguish ccache from sccache. + + +@depends_if(ccache) +def ccache_is_sccache(ccache): + return check_cmd_output(ccache, "--version").startswith("sccache") + + +@depends(ccache, ccache_is_sccache) +def using_ccache(ccache, ccache_is_sccache): + return ccache and not ccache_is_sccache + + +@depends_if(ccache, ccache_is_sccache) +def using_sccache(ccache, ccache_is_sccache): + return ccache and ccache_is_sccache + + +option(env="RUSTC_WRAPPER", nargs=1, help="Wrap rust compilation with given tool") + + +@depends(ccache, ccache_is_sccache, "RUSTC_WRAPPER") +@imports(_from="textwrap", _import="dedent") +@imports("os") +def check_sccache_version(ccache, ccache_is_sccache, rustc_wrapper): + sccache_min_version = Version("0.2.13") + + def check_version(path): + out = check_cmd_output(path, "--version") + version = Version(out.rstrip().split()[-1]) + if version < sccache_min_version: + die( + dedent( + """\ + sccache %s or later is required. sccache in use at %s has + version %s. + + Please upgrade or acquire a new version with |./mach bootstrap|. + """ + ), + sccache_min_version, + path, + version, + ) + + if ccache and ccache_is_sccache: + check_version(ccache) + + if rustc_wrapper and ( + os.path.splitext(os.path.basename(rustc_wrapper[0]))[0].lower() == "sccache" + ): + check_version(rustc_wrapper[0]) + + +set_config("MOZ_USING_CCACHE", using_ccache) +set_config("MOZ_USING_SCCACHE", using_sccache) + +option(env="SCCACHE_VERBOSE_STATS", help="Print verbose sccache stats after build") + + +@depends(using_sccache, "SCCACHE_VERBOSE_STATS") +def sccache_verbose_stats(using_sccache, verbose_stats): + return using_sccache and bool(verbose_stats) + + +set_config("SCCACHE_VERBOSE_STATS", sccache_verbose_stats) + + +@depends("--with-compiler-wrapper", ccache) +@imports(_from="mozbuild.shellutil", _import="split", _as="shell_split") +def compiler_wrapper(wrapper, ccache): + if wrapper: + raw_wrapper = wrapper[0] + wrapper = shell_split(raw_wrapper) + wrapper_program = find_program(wrapper[0]) + if not wrapper_program: + die( + "Cannot find `%s` from the given compiler wrapper `%s`", + wrapper[0], + raw_wrapper, + ) + wrapper[0] = wrapper_program + + if ccache: + if wrapper: + return tuple([ccache] + wrapper) + else: + return (ccache,) + elif wrapper: + return tuple(wrapper) + + +@depends_if(compiler_wrapper) +def using_compiler_wrapper(compiler_wrapper): + return True + + +set_config("MOZ_USING_COMPILER_WRAPPER", using_compiler_wrapper) + + +@dependable +def wasm(): + return split_triplet("wasm32-wasi", allow_wasi=True) + + +@template +def default_c_compilers(host_or_target, other_c_compiler=None): + """Template defining the set of default C compilers for the host and + target platforms. + `host_or_target` is either `host` or `target` (the @depends functions + from init.configure. + `other_c_compiler` is the `target` C compiler when `host_or_target` is `host`. + """ + assert host_or_target in {host, target, wasm} + + other_c_compiler = () if other_c_compiler is None else (other_c_compiler,) + + @depends(host_or_target, target, toolchain_prefix, *other_c_compiler) + def default_c_compilers( + host_or_target, target, toolchain_prefix, *other_c_compiler + ): + if host_or_target.kernel == "WINNT": + if host_or_target.abi: + if host_or_target.abi == "msvc": + supported = types = ("clang-cl",) + elif host_or_target.abi == "mingw": + supported = types = ("clang",) + else: + supported = types = ("clang-cl", "clang") + elif host_or_target.kernel == "Darwin": + types = ("clang",) + supported = ("clang", "gcc") + elif host_or_target.kernel == "WASI": + supported = types = ("clang",) + else: + supported = types = ("clang", "gcc") + + info = other_c_compiler[0] if other_c_compiler else None + if info and info.type in supported: + # When getting default C compilers for the host, we prioritize the + # same compiler as the target C compiler. + prioritized = info.compiler + if info.type == "gcc": + same_arch = same_arch_different_bits() + if ( + target.cpu != host_or_target.cpu + and (target.cpu, host_or_target.cpu) not in same_arch + and (host_or_target.cpu, target.cpu) not in same_arch + ): + # If the target C compiler is GCC, and it can't be used with + # -m32/-m64 for the host, it's probably toolchain-prefixed, + # so we prioritize a raw 'gcc' instead. + prioritized = info.type + if target.os != "WINNT" and host_or_target.os == "WINNT": + # When cross-compiling on Windows, don't prioritize. We'll fallback + # to checking for clang-cl first. + pass + else: + types = [prioritized] + [t for t in types if t != info.type] + + gcc = ("gcc",) + if toolchain_prefix and host_or_target is target: + gcc = tuple("%sgcc" % p for p in toolchain_prefix) + gcc + + result = [] + for type in types: + if type == "gcc": + result.extend(gcc) + else: + result.append(type) + + return tuple(result) + + return default_c_compilers + + +@template +def default_cxx_compilers(c_compiler, other_c_compiler=None, other_cxx_compiler=None): + """Template defining the set of default C++ compilers for the host and + target platforms. + `c_compiler` is the @depends function returning a Compiler instance for + the desired platform. + + Because the build system expects the C and C++ compilers to be from the + same compiler suite, we derive the default C++ compilers from the C + compiler that was found if none was provided. + + We also factor in the target C++ compiler when getting the default host + C++ compiler, using the target C++ compiler if the host and target C + compilers are the same. + """ + + assert (other_c_compiler is None) == (other_cxx_compiler is None) + if other_c_compiler is not None: + other_compilers = (other_c_compiler, other_cxx_compiler) + else: + other_compilers = () + + @depends(c_compiler, *other_compilers) + def default_cxx_compilers(c_compiler, *other_compilers): + if other_compilers: + other_c_compiler, other_cxx_compiler = other_compilers + if other_c_compiler.compiler == c_compiler.compiler: + return (other_cxx_compiler.compiler,) + + dir = os.path.dirname(c_compiler.compiler) + file = os.path.basename(c_compiler.compiler) + + if c_compiler.type == "gcc": + return (os.path.join(dir, file.replace("gcc", "g++")),) + + if c_compiler.type == "clang": + return (os.path.join(dir, file.replace("clang", "clang++")),) + + return (c_compiler.compiler,) + + return default_cxx_compilers + + +@template +def provided_program(env_var, when=None): + """Template handling cases where a program can be specified either as a + path or as a path with applicable arguments. + """ + + @depends_if(env_var, when=when) + @imports(_from="itertools", _import="takewhile") + @imports(_from="mozbuild.shellutil", _import="split", _as="shell_split") + def provided(cmd): + # Assume the first dash-prefixed item (and any subsequent items) are + # command-line options, the item before the dash-prefixed item is + # the program we're looking for, and anything before that is a wrapper + # of some kind (e.g. sccache). + cmd = shell_split(cmd[0]) + + without_flags = list(takewhile(lambda x: not x.startswith("-"), cmd)) + + return namespace( + wrapper=without_flags[:-1], + program=without_flags[-1], + flags=cmd[len(without_flags) :], + ) + + return provided + + +@template +def sysroot(host_or_target, target_sysroot=None): + assert target_sysroot or host_or_target is target + bootstrap_target_when = target_is_linux_or_wasi + if host_or_target is host: + host_or_target_str = "host" + opt = "--with-host-sysroot" + env = "HOST_SYSROOT" + when = depends(host)(lambda h: h.kernel == "Linux") + + # Only bootstrap a host sysroot when using a bootstrapped target sysroot + # or when the target doesn't use a bootstrapped sysroot in the first place. + @depends(when, bootstrap_target_when, target_sysroot.bootstrapped) + def bootstrap_when(when, bootstrap_target_when, bootstrapped): + return when and (bootstrapped or not bootstrap_target_when) + + else: + assert host_or_target is target + host_or_target_str = "target" + opt = "--with-sysroot" + env = "SYSROOT" + when = target_is_linux_or_wasi + bootstrap_when = bootstrap_target_when + + option( + opt, + env=env, + nargs=1, + when=when, + help="Use the given sysroot directory for %s build" % host_or_target_str, + ) + + sysroot_input = depends(opt, when=when)(lambda x: x) + bootstrap_sysroot = depends(bootstrap_when, sysroot_input)( + # Only bootstrap when no flag was explicitly given (either --with or --without) + lambda bootstrap, input: bootstrap + and not input + and input.origin == "default" + ) + + @depends( + sysroot_input, + host_or_target, + macos_sdk, + bootstrap_path( + depends(host_or_target)(lambda t: "sysroot-{}".format(t.toolchain)), + when=bootstrap_sysroot, + ), + ) + @imports("os") + def sysroot(sysroot_input, host_or_target, macos_sdk, path): + version = None + if sysroot_input: + path = sysroot_input[0] + elif host_or_target.kernel == "Darwin" and macos_sdk: + path = macos_sdk + if path: + # Find the version of libstdc++ headears in the sysroot + include = os.path.join(path, "usr/include/c++") + if os.path.isdir(include): + with os.scandir(include) as d: + version = max(Version(e.name) for e in d if e.is_dir()) + log.info("Using %s sysroot in %s", host_or_target_str, path) + return namespace( + path=path, + bootstrapped=bool(path and not sysroot_input), + stdcxx_version=version, + ) + + return sysroot + + +target_sysroot = sysroot(target) + + +# Use `system_lib_option` instead of `option` for options that enable building +# with a system library for which the development headers are not available in +# the bootstrapped sysroots. +@template +def system_lib_option(name, *args, **kwargs): + option(name, *args, **kwargs) + + @depends(name, target_sysroot.bootstrapped) + def no_system_lib_in_sysroot(value, bootstrapped): + if bootstrapped and value: + die( + "%s is not supported with bootstrapped sysroot. " + "Drop the option, or use --without-sysroot or --disable-bootstrap", + value.format(name), + ) + + +host_sysroot = sysroot(host, target_sysroot) + + +@template +def multiarch_dir(host_or_target): + sysroot = { + host: host_sysroot, + target: target_sysroot, + }[host_or_target] + + @depends(host_or_target, when=sysroot.path) + def multiarch_dir(target): + if target.cpu == "x86": + # Turn e.g. i686-linux-gnu into i386-linux-gnu + return target.toolchain.replace(target.raw_cpu, "i386") + return target.toolchain + + return multiarch_dir + + +target_multiarch_dir = multiarch_dir(target) +host_multiarch_dir = multiarch_dir(host) + + +def minimum_gcc_version(): + return Version("8.1.0") + + +@template +def compiler( + language, + host_or_target, + c_compiler=None, + other_compiler=None, + other_c_compiler=None, +): + """Template handling the generic base checks for the compiler for the + given `language` on the given platform (`host_or_target`). + `host_or_target` is either `host` or `target` (the @depends functions + from init.configure. + When the language is 'C++', `c_compiler` is the result of the `compiler` + template for the language 'C' for the same `host_or_target`. + When `host_or_target` is `host`, `other_compiler` is the result of the + `compiler` template for the same `language` for `target`. + When `host_or_target` is `host` and the language is 'C++', + `other_c_compiler` is the result of the `compiler` template for the + language 'C' for `target`. + """ + assert host_or_target in {host, target, wasm} + assert language in ("C", "C++") + assert language == "C" or c_compiler is not None + assert host_or_target is target or other_compiler is not None + assert language == "C" or host_or_target is target or other_c_compiler is not None + + host_or_target_str = { + host: "host", + target: "target", + wasm: "wasm", + }[host_or_target] + + sysroot = { + host: host_sysroot, + target: target_sysroot, + wasm: dependable(lambda: namespace(path=None)), + }[host_or_target] + + multiarch_dir = { + host: host_multiarch_dir, + target: target_multiarch_dir, + wasm: never, + }[host_or_target] + + var = { + ("C", target): "CC", + ("C++", target): "CXX", + ("C", host): "HOST_CC", + ("C++", host): "HOST_CXX", + ("C", wasm): "WASM_CC", + ("C++", wasm): "WASM_CXX", + }[language, host_or_target] + + default_compilers = { + "C": lambda: default_c_compilers(host_or_target, other_compiler), + "C++": lambda: default_cxx_compilers( + c_compiler, other_c_compiler, other_compiler + ), + }[language]() + + what = "the %s %s compiler" % (host_or_target_str, language) + + option(env=var, nargs=1, help="Path to %s" % what) + + # Handle the compiler given by the user through one of the CC/CXX/HOST_CC/ + # HOST_CXX variables. + provided_compiler = provided_program(var) + + # Normally, we'd use `var` instead of `_var`, but the interaction with + # old-configure complicates things, and for now, we a) can't take the plain + # result from check_prog as CC/CXX/HOST_CC/HOST_CXX and b) have to let + # old-configure AC_SUBST it (because it's autoconf doing it, not us) + compiler = check_prog( + "_%s" % var, + what=what, + progs=default_compilers, + input=provided_compiler.program, + paths=clang_search_path, + ) + + @depends( + configure_cache, + compiler, + provided_compiler, + compiler_wrapper, + host_or_target, + sysroot, + macos_target, + android_version, + vc_compiler_version, + multiarch_dir, + winsysroot, + host, + ) + @checking("whether %s can be used" % what, lambda x: bool(x)) + @imports(_from="mozbuild.shellutil", _import="quote") + @imports("os") + def valid_compiler( + configure_cache, + compiler, + provided_compiler, + compiler_wrapper, + host_or_target, + sysroot, + macos_target, + android_version, + vc_compiler_version, + multiarch_dir, + winsysroot, + host, + ): + wrapper = list(compiler_wrapper or ()) + flags = [] + if sysroot.path: + if host_or_target.kernel == "Darwin": + # While --sysroot and -isysroot are roughly equivalent, when not using + # -isysroot on mac, clang takes the SDKROOT environment variable into + # consideration, which may be set by python and break things. + flags.extend(("-isysroot", sysroot.path)) + else: + flags.extend(("--sysroot", sysroot.path)) + if provided_compiler: + wrapper.extend(provided_compiler.wrapper) + flags.extend(provided_compiler.flags) + + info = check_compiler( + configure_cache, + wrapper + [compiler] + flags, + language, + host_or_target, + android_version, + ) + + if host_or_target.os == "OSX" and macos_target: + flags.append("-mmacosx-version-min=%s" % macos_target) + + # When not given an explicit compatibility version, clang-cl tries + # to get one from MSVC, which might not even be the one used by the + # build. And when it can't find one, its default might also not match + # what the build is using. So if we were able to figure out the version + # we're building with, explicitly use that. + # This also means that, as a side effect, clang-cl will not try to find + # MSVC, which saves a little overhead. + if info.type == "clang-cl" and vc_compiler_version: + flags.append(f"-fms-compatibility-version={vc_compiler_version}") + + if info.type == "clang" and language == "C++" and host_or_target.os == "OSX": + flags.append("-stdlib=libc++") + + # Check that the additional flags we got are enough to not require any + # more flags. If we get an exception, just ignore it; it's liable to be + # invalid command-line flags, which means the compiler we're checking + # doesn't support those command-line flags and will fail one or more of + # the checks below. + try: + if info.flags: + flags += info.flags + info = check_compiler( + configure_cache, + wrapper + [compiler] + flags, + language, + host_or_target, + android_version, + ) + except FatalCheckError: + pass + + if not info.target_cpu or info.target_cpu != host_or_target.cpu: + raise FatalCheckError( + "%s %s compiler target CPU (%s) does not match --%s CPU (%s)" + % ( + host_or_target_str.capitalize(), + language, + info.target_cpu or "unknown", + host_or_target_str, + host_or_target.raw_cpu, + ) + ) + + if not info.target_kernel or (info.target_kernel != host_or_target.kernel): + raise FatalCheckError( + "%s %s compiler target kernel (%s) does not match --%s kernel (%s)" + % ( + host_or_target_str.capitalize(), + language, + info.target_kernel or "unknown", + host_or_target_str, + host_or_target.kernel, + ) + ) + + if not info.target_endianness or ( + info.target_endianness != host_or_target.endianness + ): + raise FatalCheckError( + "%s %s compiler target endianness (%s) does not match --%s " + "endianness (%s)" + % ( + host_or_target_str.capitalize(), + language, + info.target_endianness or "unknown", + host_or_target_str, + host_or_target.endianness, + ) + ) + + # Compiler version checks + # =================================================== + # Check the compiler version here instead of in `compiler_version` so + # that the `checking` message doesn't pretend the compiler can be used + # to then bail out one line later. + if info.type == "gcc": + if host_or_target.os == "Android": + raise FatalCheckError( + "GCC is not supported on Android.\n" + "Please use clang from the Android NDK instead." + ) + gcc_version = minimum_gcc_version() + if info.version < gcc_version: + raise FatalCheckError( + "Only GCC %d.%d or newer is supported (found version %s)." + % (gcc_version.major, gcc_version.minor, info.version) + ) + + # Force GCC to use the C++ headers from the sysroot, and to prefer the + # sysroot system headers to /usr/include. + # Non-Debian GCC also doesn't look at headers in multiarch directory. + if sysroot.bootstrapped and sysroot.stdcxx_version: + version = sysroot.stdcxx_version + for path in ( + "usr/include/c++/{}".format(version), + "usr/include/{}/c++/{}".format(multiarch_dir, version), + "usr/include/{}".format(multiarch_dir), + "usr/include", + ): + flags.extend(("-isystem", os.path.join(sysroot.path, path))) + + if info.type == "clang-cl": + if info.version < "9.0.0": + raise FatalCheckError( + "Only clang-cl 9.0 or newer is supported (found version %s)" + % info.version + ) + if winsysroot and host.os != "WINNT": + overlay = os.path.join(winsysroot, "overlay.yaml") + if os.path.exists(overlay): + overlay_flags = ["-Xclang", "-ivfsoverlay", "-Xclang", overlay] + if info.version >= "16.0" or ( + # clang-cl 15 normally doesn't support the root-relative + # overlay we use, but the bootstrapped clang-cl 15 is patched + # to support it, so check we're using a patched version. + info.version >= "15.0" + and try_preprocess( + configure_cache, + [compiler] + flags + overlay_flags, + language, + "", + onerror=lambda: False, + wrapper=wrapper, + ) + ): + flags.extend(overlay_flags) + + if (info.type, host_or_target.abi) in ( + ("clang", "msvc"), + ("clang-cl", "mingw"), + ): + raise FatalCheckError("Unknown compiler or compiler not supported.") + + # If you want to bump the version check here ensure the version + # is known for Xcode in get_compiler_info. + if info.type == "clang" and info.version < "8.0": + raise FatalCheckError( + "Only clang/llvm 8.0 or newer is supported (found version %s)." + % info.version + ) + + if host_or_target.kernel == "WASI": + if info.type != "clang": + raise FatalCheckError( + "Only clang is supported for %s" % host_or_target.alias + ) + if info.version < "8.0": + raise FatalCheckError( + "Only clang/llvm 8.0 or newer is supported for %s (found version %s)." + % (host_or_target.alias, info.version) + ) + + if host_or_target.os == "Android": + # Need at least clang 13 for compiler-rt/libunwind being the default. + if info.type == "clang" and info.version < "13.0": + raise FatalCheckError( + "Only clang/llvm 13.0 or newer is supported for %s (found version %s)." + % (host_or_target.alias, info.version) + ) + + if info.flags: + raise FatalCheckError("Unknown compiler or compiler not supported.") + + return namespace( + wrapper=wrapper, + compiler=compiler, + flags=flags, + type=info.type, + version=info.version, + language=language, + ) + + @depends(valid_compiler) + @checking("%s version" % what) + def compiler_version(compiler): + return compiler.version + + if language == "C++": + + @depends(valid_compiler, c_compiler) + def valid_compiler(compiler, c_compiler): + if compiler.type != c_compiler.type: + die( + "The %s C compiler is %s, while the %s C++ compiler is " + "%s. Need to use the same compiler suite.", + host_or_target_str, + c_compiler.type, + host_or_target_str, + compiler.type, + ) + + if compiler.version != c_compiler.version: + die( + "The %s C compiler is version %s, while the %s C++ " + "compiler is version %s. Need to use the same compiler " + "version.", + host_or_target_str, + c_compiler.version, + host_or_target_str, + compiler.version, + ) + return compiler + + # Set CC/CXX/HOST_CC/HOST_CXX for old-configure, which needs the wrapper + # and the flags that were part of the user input for those variables to + # be provided. + add_old_configure_assignment( + var, + depends_if(valid_compiler)( + lambda x: list(x.wrapper) + [x.compiler] + list(x.flags) + ), + ) + + if host_or_target is target: + add_old_configure_assignment( + "ac_cv_prog_%s" % var, + depends_if(valid_compiler)( + lambda x: list(x.wrapper) + [x.compiler] + list(x.flags) + ), + ) + # We check that it works in python configure already. + add_old_configure_assignment("ac_cv_prog_%s_works" % var.lower(), "yes") + add_old_configure_assignment( + "ac_cv_prog_%s_cross" % var.lower(), + depends(cross_compiling)(lambda x: "yes" if x else "no"), + ) + gcc_like = depends(valid_compiler.type)( + lambda x: "yes" if x in ("gcc", "clang") else "no" + ) + add_old_configure_assignment("ac_cv_prog_%s_g" % var.lower(), gcc_like) + if language == "C": + add_old_configure_assignment("ac_cv_prog_gcc", gcc_like) + if language == "C++": + add_old_configure_assignment("ac_cv_prog_gxx", gcc_like) + + # Set CC_TYPE/CC_VERSION/HOST_CC_TYPE/HOST_CC_VERSION to allow + # old-configure to do some of its still existing checks. + if language == "C": + set_config("%s_TYPE" % var, valid_compiler.type) + add_old_configure_assignment("%s_TYPE" % var, valid_compiler.type) + set_config( + "%s_VERSION" % var, depends(valid_compiler.version)(lambda v: str(v)) + ) + + valid_compiler = compiler_class(valid_compiler, host_or_target) + + def compiler_error(): + raise FatalCheckError( + "Failed compiling a simple %s source with %s" % (language, what) + ) + + valid_compiler.try_compile(check_msg="%s works" % what, onerror=compiler_error) + + set_config("%s_BASE_FLAGS" % var, valid_compiler.flags) + + # Set CPP/CXXCPP for both the build system and old-configure. We don't + # need to check this works for preprocessing, because we already relied + # on $CC -E/$CXX -E doing preprocessing work to validate the compiler + # in the first place. + if host_or_target is target: + pp_var = { + "C": "CPP", + "C++": "CXXCPP", + }[language] + + preprocessor = depends_if(valid_compiler)( + lambda x: list(x.wrapper) + [x.compiler, "-E"] + list(x.flags) + ) + + set_config(pp_var, preprocessor) + add_old_configure_assignment(pp_var, preprocessor) + + if language == "C": + linker_var = { + target: "LD", + host: "HOST_LD", + }.get(host_or_target) + + if linker_var: + + @deprecated_option(env=linker_var, nargs=1) + def linker(value): + if value: + return value[0] + + @depends(linker) + def unused_linker(linker): + if linker: + log.warning( + "The value of %s is not used by this build system." % linker_var + ) + + return valid_compiler + + +c_compiler = compiler("C", target) +cxx_compiler = compiler("C++", target, c_compiler=c_compiler) +host_c_compiler = compiler("C", host, other_compiler=c_compiler) +host_cxx_compiler = compiler( + "C++", + host, + c_compiler=host_c_compiler, + other_compiler=cxx_compiler, + other_c_compiler=c_compiler, +) + + +@template +def windows_abi(host_or_target, c_compiler): + @depends(host_or_target) + def windows_abi(host_or_target): + if host_or_target.os == "WINNT": + return host_or_target.abi + + @depends(host_or_target, windows_abi) + def need_windows_abi_from_compiler(host_or_target, windows_abi): + return host_or_target.os == "WINNT" and windows_abi is None + + @depends(host_or_target, c_compiler, when=need_windows_abi_from_compiler) + def windows_abi_from_compiler(host_or_target, c_compiler): + if host_or_target.os == "WINNT": + if c_compiler.type == "clang-cl": + return "msvc" + return "mingw" + + return windows_abi | windows_abi_from_compiler + + +target_windows_abi = windows_abi(target, c_compiler) +host_windows_abi = windows_abi(host, host_c_compiler) + + +# Generic compiler-based conditions. +building_with_gcc = depends(c_compiler)(lambda info: info.type == "gcc") + + +@depends(cxx_compiler, ccache_prefix) +@imports("os") +def cxx_is_icecream(info, ccache_prefix): + if ( + os.path.islink(info.compiler) + and os.path.basename(os.readlink(info.compiler)) == "icecc" + ): + return True + if ccache_prefix and os.path.basename(ccache_prefix) == "icecc": + return True + + +set_config("CXX_IS_ICECREAM", cxx_is_icecream) + + +# Libstdc++ compatibility hacks +# ============================================================== +# +@depends(target, host) +def target_or_host_is_linux(target, host): + return any(t.os == "GNU" and t.kernel == "Linux" for t in (target, host)) + + +option( + "--enable-stdcxx-compat", + env="MOZ_STDCXX_COMPAT", + help="Enable compatibility with older libstdc++", + when=target_or_host_is_linux, +) + + +@depends("--enable-stdcxx-compat", when=target_or_host_is_linux) +def stdcxx_compat(value): + if value: + return True + + +set_config("MOZ_STDCXX_COMPAT", True, when=stdcxx_compat) + + +# Linker detection +# ============================================================== +# The policy is as follows: +# For Windows: +# - the linker is picked via the LINKER environment variable per windows.configure, +# but ought to be lld-link in any case. +# For macOS: +# - the linker is lld if the clang used is >= 15 (per LLVM version, not Xcode version). +# - the linker is also lld on local developer builds if the clang used is >= 13 (per LLVM +# version, not Xcode version) +# - otherwise the linker is ld64, either from XCode on macOS, or from cctools-ports when +# cross-compiling. +# For other OSes: +# - on local developer builds: lld if present and the compiler is clang. Otherwise gold +# is used if present otherwise, whatever the compiler uses by default. +# - on release/official builds: whatever the compiler uses by default, except when the +# compiler is clang, in which case lld is preferred when it's new enough. +@template +def is_not_winnt_or_sunos(host_or_target): + @depends(host_or_target) + def is_not_winnt_or_sunos(host_or_target): + if host_or_target.kernel not in ("WINNT", "SunOS"): + return True + + return is_not_winnt_or_sunos + + +is_linker_option_enabled = is_not_winnt_or_sunos(target) + + +@deprecated_option("--enable-gold", env="MOZ_FORCE_GOLD", when=is_linker_option_enabled) +def enable_gold(value): + if value: + die("--enable-gold is deprecated, use --enable-linker=gold instead") + else: + die("--disable-gold is deprecated, use --enable-linker=something_else instead") + + +option( + "--enable-linker", + nargs=1, + help="Select the linker {bfd, gold, ld64, lld, lld-*, mold}", + when=is_linker_option_enabled, +) + + +# No-op to enable depending on --enable-linker from default_elfhack in +# toolkit/moz.configure. +@depends("--enable-linker", when=is_linker_option_enabled) +def enable_linker(linker): + return linker + + +@template +def select_linker_tmpl(host_or_target): + if host_or_target is target: + deps = depends( + "--enable-linker", + c_compiler, + developer_options, + extra_toolchain_flags, + target, + stdcxx_compat, + when=is_linker_option_enabled, + ) + host_or_target_str = "target" + else: + deps = depends( + dependable(None), + host_c_compiler, + developer_options, + dependable(None), + host, + stdcxx_compat, + when=is_not_winnt_or_sunos(host_or_target), + ) + host_or_target_str = "host" + + @deps + @checking(f"for {host_or_target_str} linker", lambda x: x.KIND) + @imports("os") + @imports("shutil") + def select_linker( + linker, c_compiler, developer_options, toolchain_flags, target, stdcxx_compat + ): + if linker: + linker = linker[0] + else: + linker = None + + def is_valid_linker(linker): + if target.kernel == "Darwin": + valid_linkers = ("ld64", "lld") + else: + valid_linkers = ("bfd", "gold", "lld", "mold") + if linker in valid_linkers: + return True + if "lld" in valid_linkers and linker.startswith("lld-"): + return True + return False + + if linker and not is_valid_linker(linker): + # Check that we are trying to use a supported linker + die("Unsupported linker " + linker) + + # Check the kind of linker + version_check = ["-Wl,--version"] + cmd_base = c_compiler.wrapper + [c_compiler.compiler] + c_compiler.flags + + def try_linker(linker): + # Generate the compiler flag + if linker == "ld64": + linker_flag = ["-fuse-ld=ld"] + elif linker: + linker_flag = ["-fuse-ld=" + linker] + else: + linker_flag = [] + cmd = cmd_base + linker_flag + version_check + if toolchain_flags: + cmd += toolchain_flags + + # ld64 doesn't have anything to print out a version. It does print out + # "ld64: For information on command line options please use 'man ld'." + # but that would require doing two attempts, one with --version, that + # would fail, and another with --help. + # Instead, abuse its LD_PRINT_OPTIONS feature to detect a message + # specific to it on stderr when it fails to process --version. + env = dict(os.environ) + env["LD_PRINT_OPTIONS"] = "1" + # Some locales might not print out the strings we are looking for, so + # ensure consistent output. + env["LC_ALL"] = "C" + retcode, stdout, stderr = get_cmd_output(*cmd, env=env) + if retcode == 1 and "Logging ld64 options" in stderr: + kind = "ld64" + + elif retcode != 0: + return None + + elif "mold" in stdout: + kind = "mold" + + elif "GNU ld" in stdout: + # We are using the normal linker + kind = "bfd" + + elif "GNU gold" in stdout: + kind = "gold" + + elif "LLD" in stdout: + kind = "lld" + + else: + kind = "unknown" + + if kind == "unknown" or is_valid_linker(kind): + return namespace( + KIND=kind, + LINKER_FLAG=linker_flag, + ) + + result = None + if linker: + result = try_linker(linker) + if result is None: + die("Could not use {} as linker".format(linker)) + + if ( + result is None + and c_compiler.type == "clang" + and ( + ( + target.kernel != "Darwin" + and ( + developer_options + or host_or_target_str == "host" + or c_compiler.version >= "15.0" + ) + ) + or ( + target.kernel == "Darwin" + and ( + (developer_options and c_compiler.version >= "13.0") + or c_compiler.version >= "15.0" + ) + ) + ) + ): + result = try_linker("lld") + + if result is None and developer_options and not stdcxx_compat: + result = try_linker("gold") + + if result is None: + result = try_linker(None) + + if result is None: + die("Failed to find an adequate linker") + + if stdcxx_compat and result.KIND == "gold": + die("--enable-stdcxx-compat is not compatible with the gold linker") + + # If an explicit linker was given, error out if what we found is different. + if linker and not linker.startswith(result.KIND): + die("Could not use {} as linker".format(linker)) + + return result + + return select_linker + + +select_linker = select_linker_tmpl(target) +set_config("LINKER_KIND", select_linker.KIND) + + +@template +def linker_ldflags_tmpl(host_or_target): + if host_or_target is target: + deps = depends_if( + select_linker, + target, + target_sysroot, + target_multiarch_dir, + android_sysroot, + android_version, + c_compiler, + developer_options, + ) + else: + deps = depends_if( + select_linker_tmpl(host), + host, + host_sysroot, + host_multiarch_dir, + dependable(None), + dependable(None), + host_c_compiler, + developer_options, + ) + + @deps + @imports("os") + def linker_ldflags( + linker, + target, + sysroot, + multiarch_dir, + android_sysroot, + android_version, + c_compiler, + developer_options, + ): + flags = list((linker and linker.LINKER_FLAG) or []) + # rpath-link is irrelevant to wasm, see for more info https://github.com/emscripten-core/emscripten/issues/11076. + if sysroot.path and multiarch_dir and target.os != "WASI": + for d in ("lib", "usr/lib"): + multiarch_lib_dir = os.path.join(sysroot.path, d, multiarch_dir) + if os.path.exists(multiarch_lib_dir): + # Non-Debian-patched binutils linkers (both BFD and gold) don't lookup + # in multi-arch directories. + flags.append("-Wl,-rpath-link,%s" % multiarch_lib_dir) + # GCC also needs -L. + if c_compiler.type == "gcc": + flags.append("-L%s" % multiarch_lib_dir) + if ( + c_compiler.type == "gcc" + and sysroot.bootstrapped + and sysroot.stdcxx_version + ): + flags.append( + "-L{}/usr/lib/gcc/{}/{}".format( + sysroot.path, multiarch_dir, sysroot.stdcxx_version + ) + ) + if android_sysroot: + # BFD/gold linkers need a manual --rpath-link for indirect + # dependencies. + flags += [ + "-Wl,--rpath-link={}/usr/lib/{}".format( + android_sysroot, target.toolchain + ), + "-Wl,--rpath-link={}/usr/lib/{}/{}".format( + android_sysroot, target.toolchain, android_version + ), + ] + if ( + developer_options + and linker + and linker.KIND == "lld" + and target.kernel != "WINNT" + ): + flags.append("-Wl,-O0") + return flags + + return linker_ldflags + + +linker_ldflags = linker_ldflags_tmpl(target) +add_old_configure_assignment("LINKER_LDFLAGS", linker_ldflags) + +host_linker_ldflags = linker_ldflags_tmpl(host) +add_old_configure_assignment("HOST_LINKER_LDFLAGS", host_linker_ldflags) + + +# There's a wrinkle with MinGW: linker configuration is not enabled, so +# `select_linker` is never invoked. Hard-code around it. +@depends(select_linker, target, c_compiler) +def gcc_use_gnu_ld(select_linker, target, c_compiler): + if select_linker is not None and target.kernel != "Darwin": + return select_linker.KIND in ("bfd", "gold", "lld", "mold") + if target.kernel == "WINNT" and c_compiler.type == "clang": + return True + return None + + +# GCC_USE_GNU_LD=1 means the linker is command line compatible with GNU ld. +set_config("GCC_USE_GNU_LD", gcc_use_gnu_ld) +add_old_configure_assignment("GCC_USE_GNU_LD", gcc_use_gnu_ld) + + +include("compile-checks.configure") +include("arm.configure", when=depends(target.cpu)(lambda cpu: cpu == "arm")) + + +@depends( + have_64_bit, + try_compile( + body='static_assert(sizeof(void *) == 8, "")', check_msg="for 64-bit OS" + ), +) +def check_have_64_bit(have_64_bit, compiler_have_64_bit): + if have_64_bit != compiler_have_64_bit: + configure_error( + "The target compiler does not agree with configure " + "about the target bitness." + ) + + +@depends(cxx_compiler, target) +def needs_libstdcxx_newness_check(cxx_compiler, target): + # We only have to care about this on Linux and MinGW. + if cxx_compiler.type == "clang-cl": + return + + if target.kernel not in ("Linux", "WINNT"): + return + + if target.os == "Android": + return + + return True + + +def die_on_old_libstdcxx(): + die( + "The libstdc++ in use is not new enough. Please run " + "./mach bootstrap to update your compiler, or update your system " + "libstdc++ installation." + ) + + +try_compile( + includes=["cstddef"], + body="\n".join( + [ + # _GLIBCXX_RELEASE showed up in libstdc++ 7. + "#if defined(__GLIBCXX__) && !defined(_GLIBCXX_RELEASE)", + "# error libstdc++ not new enough", + "#endif", + "#if defined(_GLIBCXX_RELEASE)", + "# if _GLIBCXX_RELEASE < %d" % minimum_gcc_version().major, + "# error libstdc++ not new enough", + "# else", + " (void) 0", + "# endif", + "#endif", + ] + ), + check_msg="for new enough STL headers from libstdc++", + when=needs_libstdcxx_newness_check, + onerror=die_on_old_libstdcxx, +) + + +@depends(c_compiler, target) +def default_debug_flags(compiler_info, target): + # Debug info is ON by default. + if compiler_info.type == "clang-cl": + return "-Z7" + elif target.kernel == "WINNT" and compiler_info.type == "clang": + return "-g -gcodeview" + # The oldest versions of supported compilers default to DWARF-4, but + # newer versions may default to DWARF-5 or newer (e.g. clang 14), which + # Valgrind doesn't support. Force-use DWARF-4. + return "-gdwarf-4" + + +option(env="MOZ_DEBUG_FLAGS", nargs=1, help="Debug compiler flags") + +imply_option("--enable-debug-symbols", depends_if("--enable-debug")(lambda v: v)) + +option( + "--disable-debug-symbols", + nargs="?", + help="Disable debug symbols using the given compiler flags", +) + +set_config("MOZ_DEBUG_SYMBOLS", depends_if("--enable-debug-symbols")(lambda _: True)) + + +@depends("MOZ_DEBUG_FLAGS", "--enable-debug-symbols", default_debug_flags) +def debug_flags(env_debug_flags, enable_debug_flags, default_debug_flags): + # If MOZ_DEBUG_FLAGS is set, and --enable-debug-symbols is set to a value, + # --enable-debug-symbols takes precedence. Note, the value of + # --enable-debug-symbols may be implied by --enable-debug. + if len(enable_debug_flags): + return enable_debug_flags[0] + if env_debug_flags: + return env_debug_flags[0] + return default_debug_flags + + +set_config("MOZ_DEBUG_FLAGS", debug_flags) +add_old_configure_assignment("MOZ_DEBUG_FLAGS", debug_flags) + + +@depends(c_compiler, host) +@imports( + _from="mach.logging", _import="enable_blessed", _as="_enable_ansi_escape_codes" +) +def color_cflags(info, host): + # We could test compiling with flags. By why incur the overhead when + # color support should always be present in a specific toolchain + # version? + + # Code for auto-adding this flag to compiler invocations needs to + # determine if an existing flag isn't already present. That is likely + # using exact string matching on the returned value. So if the return + # value changes to e.g. "<x>=always", exact string match may fail and + # multiple color flags could be added. So examine downstream consumers + # before adding flags to return values. + if info.type == "gcc": + return "-fdiagnostics-color" + elif info.type in ["clang", "clang-cl"]: + if host.os == "WINNT" and _enable_ansi_escape_codes(): + return "-fcolor-diagnostics -fansi-escape-codes" + else: + return "-fcolor-diagnostics" + else: + return "" + + +set_config("COLOR_CFLAGS", color_cflags) + +# Some standard library headers (notably bionic on Android) declare standard +# functions (e.g. getchar()) and also #define macros for those standard +# functions. libc++ deals with this by doing something like the following +# (explanatory comments added): +# +# #ifdef FUNC +# // Capture the definition of FUNC. +# inline _LIBCPP_INLINE_VISIBILITY int __libcpp_FUNC(...) { return FUNC(...); } +# #undef FUNC +# // Use a real inline definition. +# inline _LIBCPP_INLINE_VISIBILITY int FUNC(...) { return _libcpp_FUNC(...); } +# #endif +# +# _LIBCPP_INLINE_VISIBILITY is typically defined as: +# +# __attribute__((__visibility__("hidden"), __always_inline__)) +# +# Unfortunately, this interacts badly with our system header wrappers, as the: +# +# #pragma GCC visibility push(default) +# +# that they do prior to including the actual system header is treated by the +# compiler as an explicit declaration of visibility on every function declared +# in the header. Therefore, when the libc++ code above is encountered, it is +# as though the compiler has effectively seen: +# +# int FUNC(...) __attribute__((__visibility__("default"))); +# int FUNC(...) __attribute__((__visibility__("hidden"))); +# +# and the compiler complains about the mismatched visibility declarations. +# +# However, libc++ will only define _LIBCPP_INLINE_VISIBILITY if there is no +# existing definition. We can therefore define it to the empty string (since +# we are properly managing visibility ourselves) and avoid this whole mess. +# Note that we don't need to do this with gcc, as libc++ detects gcc and +# effectively does the same thing we are doing here. +# +# _LIBCPP_ALWAYS_INLINE needs a similar workarounds, since it too declares +# hidden visibility. +# +# _LIBCPP_HIDE_FROM_ABI is a macro in libc++ versions in NDKs >=r19. It too +# declares hidden visibility, but it also declares functions as excluded from +# explicit instantiation (roughly: the function can be unused in the current +# compilation, but does not then trigger an actual definition of the function; +# it is assumed the real definition comes from elsewhere). We need to replicate +# this setup. + + +@depends(c_compiler, target) +def libcxx_override_visibility(c_compiler, target): + if c_compiler.type == "clang" and target.os == "Android": + return namespace( + empty="", + hide_from_abi="__attribute__((__exclude_from_explicit_instantiation__))", + ) + + +set_define("_LIBCPP_INLINE_VISIBILITY", libcxx_override_visibility.empty) +set_define("_LIBCPP_ALWAYS_INLINE", libcxx_override_visibility.empty) + +set_define("_LIBCPP_HIDE_FROM_ABI", libcxx_override_visibility.hide_from_abi) + + +@depends(target, build_environment) +def visibility_flags(target, env): + if target.os != "WINNT": + if target.kernel == "Darwin": + return ("-fvisibility=hidden", "-fvisibility-inlines-hidden") + return ( + "-I%s/system_wrappers" % os.path.join(env.dist), + "-include", + "%s/config/gcc_hidden.h" % env.topsrcdir, + ) + + +@depends(target, visibility_flags) +def wrap_system_includes(target, visibility_flags): + if visibility_flags and target.kernel != "Darwin": + return True + + +set_define( + "HAVE_VISIBILITY_HIDDEN_ATTRIBUTE", + depends(visibility_flags)(lambda v: bool(v) or None), +) +set_define( + "HAVE_VISIBILITY_ATTRIBUTE", depends(visibility_flags)(lambda v: bool(v) or None) +) +set_config("WRAP_SYSTEM_INCLUDES", wrap_system_includes) +set_config("VISIBILITY_FLAGS", visibility_flags) + + +@template +def depend_cflags(host_or_target_c_compiler): + @depends(host_or_target_c_compiler) + def depend_cflags(host_or_target_c_compiler): + if host_or_target_c_compiler.type != "clang-cl": + return ["-MD", "-MP", "-MF $(MDDEPDIR)/$(@F).pp"] + else: + # clang-cl doesn't accept the normal -MD -MP -MF options that clang + # does, but the underlying cc1 binary understands how to generate + # dependency files. These options are based on analyzing what the + # normal clang driver sends to cc1 when given the "correct" + # dependency options. + return [ + "-Xclang", + "-MP", + "-Xclang", + "-dependency-file", + "-Xclang", + "$(MDDEPDIR)/$(@F).pp", + "-Xclang", + "-MT", + "-Xclang", + "$@", + ] + + return depend_cflags + + +set_config("_DEPEND_CFLAGS", depend_cflags(c_compiler)) +set_config("_HOST_DEPEND_CFLAGS", depend_cflags(host_c_compiler)) + + +@depends(c_compiler) +def preprocess_option(compiler): + # The uses of PREPROCESS_OPTION depend on the spacing for -o/-Fi. + if compiler.type in ("gcc", "clang"): + return "-E -o " + else: + return "-P -Fi" + + +set_config("PREPROCESS_OPTION", preprocess_option) + + +# We only want to include windows.configure when we are compiling on +# Windows, or for Windows. +include("windows.configure", when=is_windows) + + +# On Power ISA, determine compiler flags for VMX, VSX and VSX-3. + +set_config( + "PPC_VMX_FLAGS", + ["-maltivec"], + when=depends(target.cpu)(lambda cpu: cpu.startswith("ppc")), +) + +set_config( + "PPC_VSX_FLAGS", + ["-mvsx"], + when=depends(target.cpu)(lambda cpu: cpu.startswith("ppc")), +) + +set_config( + "PPC_VSX3_FLAGS", + ["-mvsx", "-mcpu=power9"], + when=depends(target.cpu)(lambda cpu: cpu.startswith("ppc")), +) + +# ASAN +# ============================================================== + +option("--enable-address-sanitizer", help="Enable Address Sanitizer") + + +@depends(when="--enable-address-sanitizer") +def asan(): + return True + + +add_old_configure_assignment("MOZ_ASAN", asan) + +# MSAN +# ============================================================== + +option("--enable-memory-sanitizer", help="Enable Memory Sanitizer") + + +@depends(when="--enable-memory-sanitizer") +def msan(): + return True + + +add_old_configure_assignment("MOZ_MSAN", msan) + +# TSAN +# ============================================================== + +option("--enable-thread-sanitizer", help="Enable Thread Sanitizer") + + +@depends(when="--enable-thread-sanitizer") +def tsan(): + return True + + +add_old_configure_assignment("MOZ_TSAN", tsan) + +# UBSAN +# ============================================================== + +option( + "--enable-undefined-sanitizer", nargs="*", help="Enable UndefinedBehavior Sanitizer" +) + + +@depends("--enable-undefined-sanitizer", moz_optimize.optimize) +def ubsan(options, optimize): + if not options: + return + + default_checks = [ + "bool", + "bounds", + "enum", + "function", + "integer-divide-by-zero", + "pointer-overflow", + "return", + "vla-bound", + ] + + # adding object-size generates a warning if -O0 is set + if optimize: + default_checks.append("object-size") + + checks = options if len(options) else default_checks + + return ",".join(checks) + + +add_old_configure_assignment("MOZ_UBSAN_CHECKS", ubsan) + + +option( + "--enable-signed-overflow-sanitizer", + help="Enable UndefinedBehavior Sanitizer (Signed Integer Overflow Parts)", +) + + +@depends(when="--enable-signed-overflow-sanitizer") +def ub_signed_overflow_san(): + return True + + +add_old_configure_assignment("MOZ_SIGNED_OVERFLOW_SANITIZE", ub_signed_overflow_san) + + +option( + "--enable-unsigned-overflow-sanitizer", + help="Enable UndefinedBehavior Sanitizer (Unsigned Integer Overflow Parts)", +) + + +@depends(when="--enable-unsigned-overflow-sanitizer") +def ub_unsigned_overflow_san(): + return True + + +add_old_configure_assignment("MOZ_UNSIGNED_OVERFLOW_SANITIZE", ub_unsigned_overflow_san) + + +# Security Hardening +# ============================================================== + +option( + "--enable-hardening", + env="MOZ_SECURITY_HARDENING", + help="Enables security hardening compiler options", +) + + +# This function is a bit confusing. It adds or removes hardening flags in +# three stuations: if --enable-hardening is passed; if --disable-hardening +# is passed, and if no flag is passed. +# +# At time of this comment writing, all flags are actually added in the +# default no-flag case; making --enable-hardening the same as omitting the +# flag. --disable-hardening will omit the security flags. (However, not all +# possible security flags will be omitted by --disable-hardening, as many are +# compiler-default options we do not explicitly enable.) +@depends( + "--enable-hardening", + "--enable-address-sanitizer", + "--enable-debug", + "--enable-optimize", + c_compiler, + target, +) +def security_hardening_cflags( + hardening_flag, asan, debug, optimize, c_compiler, target +): + compiler_is_gccish = c_compiler.type in ("gcc", "clang") + mingw_clang = c_compiler.type == "clang" and target.os == "WINNT" + + flags = [] + ldflags = [] + trivial_auto_var_init = [] + + # WASI compiler doesn't support security hardening cflags + if target.os == "WASI": + return + + # ---------------------------------------------------------- + # If hardening is explicitly enabled, or not explicitly disabled + if hardening_flag.origin == "default" or hardening_flag: + # FORTIFY_SOURCE ------------------------------------ + # Require optimization for FORTIFY_SOURCE. See Bug 1417452 + # Also, undefine it before defining it just in case a distro adds it, see Bug 1418398 + if compiler_is_gccish and optimize and not asan: + flags.append("-U_FORTIFY_SOURCE") + flags.append("-D_FORTIFY_SOURCE=2") + + # fstack-protector ------------------------------------ + # Enable only if hardening is not disabled and ASAN is + # not on as ASAN will catch the crashes for us + if compiler_is_gccish and not asan: + flags.append("-fstack-protector-strong") + ldflags.append("-fstack-protector-strong") + + if ( + c_compiler.type == "clang" + and c_compiler.version >= "11.0.1" + and target.os not in ("WINNT", "OSX", "OpenBSD") + and target.cpu in ("x86", "x86_64", "ppc64", "s390x") + ): + flags.append("-fstack-clash-protection") + ldflags.append("-fstack-clash-protection") + + # ftrivial-auto-var-init ------------------------------ + # Initialize local variables with a 0xAA pattern in clang builds. + # Linux32 fails some xpcshell tests with -ftrivial-auto-var-init + linux32 = target.kernel == "Linux" and target.cpu == "x86" + if ( + (c_compiler.type == "clang" or c_compiler.type == "clang-cl") + and c_compiler.version >= "8" + and not linux32 + ): + if c_compiler.type == "clang-cl": + trivial_auto_var_init.append("-Xclang") + trivial_auto_var_init.append("-ftrivial-auto-var-init=pattern") + # Always enable on debug builds. + if debug: + flags.extend(trivial_auto_var_init) + + # ASLR ------------------------------------------------ + # ASLR (dynamicbase) is enabled by default in clang-cl; but the + # mingw-clang build requires it to be explicitly enabled + if mingw_clang: + ldflags.append("-Wl,--dynamicbase") + + # Control Flow Guard (CFG) ---------------------------- + if ( + c_compiler.type == "clang-cl" + and c_compiler.version >= "8" + and (target.cpu != "aarch64" or c_compiler.version >= "8.0.1") + ): + if target.cpu == "aarch64" and c_compiler.version >= "10.0.0": + # The added checks in clang 10 make arm64 builds crash. (Bug 1639318) + flags.append("-guard:cf,nochecks") + else: + flags.append("-guard:cf") + # nolongjmp is needed because clang doesn't emit the CFG tables of + # setjmp return addresses https://bugs.llvm.org/show_bug.cgi?id=40057 + ldflags.append("-guard:cf,nolongjmp") + + # ---------------------------------------------------------- + # If ASAN _is_ on, disable FORTIFY_SOURCE just to be safe + if asan: + flags.append("-D_FORTIFY_SOURCE=0") + + # fno-common ----------------------------------------- + # Do not merge variables for ASAN; can detect some subtle bugs + if asan: + # clang-cl does not recognize the flag, it must be passed down to clang + if c_compiler.type == "clang-cl": + flags.append("-Xclang") + flags.append("-fno-common") + + return namespace( + flags=flags, + ldflags=ldflags, + trivial_auto_var_init=trivial_auto_var_init, + ) + + +set_config("MOZ_HARDENING_CFLAGS", security_hardening_cflags.flags) +set_config("MOZ_HARDENING_LDFLAGS", security_hardening_cflags.ldflags) +set_config( + "MOZ_TRIVIAL_AUTO_VAR_INIT", + security_hardening_cflags.trivial_auto_var_init, +) + + +# Intel Control-flow Enforcement Technology +# ============================================================== +# We keep this separate from the hardening flags above, because we want to be +# able to easily remove the flags in the build files for certain executables. +@depends(c_compiler, target) +def cet_ldflags(c_compiler, target): + ldflags = [] + if ( + c_compiler.type == "clang-cl" + and c_compiler.version >= "11" + and target.cpu == "x86_64" + ): + ldflags.append("-CETCOMPAT") + return ldflags + + +set_config("MOZ_CETCOMPAT_LDFLAGS", cet_ldflags) + + +# Frame pointers +# ============================================================== +@depends(c_compiler) +def frame_pointer_flags(compiler): + if compiler.type == "clang-cl": + return namespace( + enable=["-Oy-"], + disable=["-Oy"], + ) + return namespace( + enable=["-fno-omit-frame-pointer", "-funwind-tables"], + disable=["-fomit-frame-pointer", "-funwind-tables"], + ) + + +@depends( + moz_optimize.optimize, + moz_debug, + target, + "--enable-memory-sanitizer", + "--enable-address-sanitizer", + "--enable-undefined-sanitizer", +) +def frame_pointer_default(optimize, debug, target, msan, asan, ubsan): + return bool( + not optimize + or debug + or msan + or asan + or ubsan + or (target.os == "WINNT" and target.cpu in ("x86", "aarch64")) + or target.os == "OSX" + ) + + +option( + "--enable-frame-pointers", + default=frame_pointer_default, + help="{Enable|Disable} frame pointers", +) + + +@depends("--enable-frame-pointers", frame_pointer_flags) +def frame_pointer_flags(enable, flags): + if enable: + return flags.enable + return flags.disable + + +set_config("MOZ_FRAMEPTR_FLAGS", frame_pointer_flags) + + +# Stack unwinding without frame pointers +# ============================================================== + + +have_unwind = check_symbol( + "_Unwind_Backtrace", when=check_header("unwind.h", when=target_is_unix) +) + + +# Code Coverage +# ============================================================== + +option("--enable-coverage", env="MOZ_CODE_COVERAGE", help="Enable code coverage") + + +@depends("--enable-coverage") +def code_coverage(value): + if value: + return True + + +set_config("MOZ_CODE_COVERAGE", code_coverage) +set_define("MOZ_CODE_COVERAGE", code_coverage) + + +@depends(target, c_compiler, build_environment, when=code_coverage) +@imports("os") +@imports("re") +@imports(_from="__builtin__", _import="open") +def coverage_cflags(target, c_compiler, build_env): + cflags = ["--coverage"] + + # clang 11 no longer accepts this flag (its behavior became the default) + if c_compiler.type in ("clang", "clang-cl") and c_compiler.version < "11.0.0": + cflags += [ + "-Xclang", + "-coverage-no-function-names-in-data", + ] + + exclude = [] + if target.os == "WINNT" and c_compiler.type == "clang-cl": + # VS files + exclude.append("^.*[vV][sS]20[0-9]{2}.*$") + # Files in fetches directory. + exclude.append("^.*[\\\\/]fetches[\\\\/].*$") + elif target.os == "OSX": + # Files in fetches directory. + exclude.append("^.*/fetches/.*$") + elif target.os == "GNU": + # Files in fetches directory. + exclude.append("^.*/fetches/.*$") + # Files in /usr/ + exclude.append("^/usr/.*$") + + if exclude: + exclude = ";".join(exclude) + cflags += [ + f"-fprofile-exclude-files={exclude}", + ] + + response_file_path = os.path.join(build_env.topobjdir, "code_coverage_cflags") + + with open(response_file_path, "w") as f: + f.write(" ".join(cflags)) + + return ["@{}".format(response_file_path)] + + +set_config("COVERAGE_CFLAGS", coverage_cflags) + +# Assembler detection +# ============================================================== + +option(env="AS", nargs=1, help="Path to the assembler") + + +@depends(target, c_compiler) +def as_info(target, c_compiler): + if c_compiler.type == "clang-cl": + ml = { + "x86": "ml.exe", + "x86_64": "ml64.exe", + "aarch64": "armasm64.exe", + }.get(target.cpu) + return namespace(type="masm", names=(ml,)) + # When building with anything but clang-cl, we just use the C compiler as the assembler. + return namespace(type="gcc", names=(c_compiler.compiler,)) + + +# One would expect the assembler to be specified merely as a program. But in +# cases where the assembler is passed down into js/, it can be specified in +# the same way as CC: a program + a list of argument flags. We might as well +# permit the same behavior in general, even though it seems somewhat unusual. +# So we have to do the same sort of dance as we did above with +# `provided_compiler`. +provided_assembler = provided_program("AS") +assembler = check_prog( + "_AS", + input=provided_assembler.program, + what="the assembler", + progs=as_info.names, + paths=vc_toolchain_search_path, +) + + +@depends(as_info, assembler, provided_assembler, c_compiler) +def as_with_flags(as_info, assembler, provided_assembler, c_compiler): + if provided_assembler: + return provided_assembler.wrapper + [assembler] + provided_assembler.flags + + if as_info.type == "masm": + return assembler + + assert as_info.type == "gcc" + + # Need to add compiler wrappers and flags as appropriate. + return c_compiler.wrapper + [assembler] + c_compiler.flags + + +set_config("AS", as_with_flags) + + +@depends(assembler, c_compiler, extra_toolchain_flags) +@imports("subprocess") +@imports(_from="os", _import="devnull") +def gnu_as(assembler, c_compiler, toolchain_flags): + # clang uses a compatible GNU assembler. + if c_compiler.type == "clang": + return True + + if c_compiler.type == "gcc": + cmd = [assembler] + c_compiler.flags + if toolchain_flags: + cmd += toolchain_flags + cmd += ["-Wa,--version", "-c", "-o", devnull, "-x", "assembler", "-"] + # We don't actually have to provide any input on stdin, `Popen.communicate` will + # close the stdin pipe. + # clang will error if it uses its integrated assembler for this target, + # so handle failures gracefully. + if "GNU" in check_cmd_output(*cmd, stdin=subprocess.PIPE, onerror=lambda: ""): + return True + + +set_config("GNU_AS", gnu_as) + + +@depends(as_info, target) +def as_dash_c_flag(as_info, target): + # armasm64 doesn't understand -c. + if as_info.type == "masm" and target.cpu == "aarch64": + return "" + else: + return "-c" + + +set_config("AS_DASH_C_FLAG", as_dash_c_flag) + + +@depends(as_info, target) +def as_outoption(as_info, target): + # The uses of ASOUTOPTION depend on the spacing for -o/-Fo. + if as_info.type == "masm" and target.cpu != "aarch64": + return "-Fo" + + return "-o " + + +set_config("ASOUTOPTION", as_outoption) + +# clang plugin handling +# ============================================================== + +option( + "--enable-clang-plugin", + env="ENABLE_CLANG_PLUGIN", + help="Enable building with the Clang plugin (gecko specific static analyzers)", +) + +add_old_configure_assignment( + "ENABLE_CLANG_PLUGIN", depends_if("--enable-clang-plugin")(lambda _: True) +) + + +@depends(host_c_compiler, c_compiler, when="--enable-clang-plugin") +def llvm_config(host_c_compiler, c_compiler): + clang = None + for compiler in (host_c_compiler, c_compiler): + if compiler and compiler.type == "clang": + clang = compiler.compiler + break + elif compiler and compiler.type == "clang-cl": + clang = os.path.join(os.path.dirname(compiler.compiler), "clang") + break + + if not clang: + die("Cannot --enable-clang-plugin when not building with clang") + llvm_config = "llvm-config" + out = check_cmd_output(clang, "--print-prog-name=llvm-config", onerror=lambda: None) + if out: + llvm_config = out.rstrip() + return (llvm_config,) + + +llvm_config = check_prog( + "LLVM_CONFIG", + llvm_config, + what="llvm-config", + when="--enable-clang-plugin", + paths=clang_search_path, +) + +add_old_configure_assignment("LLVM_CONFIG", llvm_config) + + +option( + "--enable-clang-plugin-alpha", + env="ENABLE_CLANG_PLUGIN_ALPHA", + help="Enable static analysis with clang-plugin alpha checks.", +) + + +@depends("--enable-clang-plugin", "--enable-clang-plugin-alpha") +def check_clang_plugin_alpha(enable_clang_plugin, enable_clang_plugin_alpha): + if enable_clang_plugin_alpha: + if enable_clang_plugin: + return True + die("Cannot enable clang-plugin alpha checkers without --enable-clang-plugin.") + + +add_old_configure_assignment("ENABLE_CLANG_PLUGIN_ALPHA", check_clang_plugin_alpha) +set_define("MOZ_CLANG_PLUGIN_ALPHA", check_clang_plugin_alpha) + +option( + "--enable-mozsearch-plugin", + env="ENABLE_MOZSEARCH_PLUGIN", + help="Enable building with the mozsearch indexer plugin", +) + +add_old_configure_assignment( + "ENABLE_MOZSEARCH_PLUGIN", depends_if("--enable-mozsearch-plugin")(lambda _: True) +) + +# Use the old libstdc++ ABI +# ============================================================== +add_flag( + "-D_GLIBCXX_USE_CXX11_ABI=0", + cxx_compiler, + when=stdcxx_compat, +) +add_flag( + "-D_GLIBCXX_USE_CXX11_ABI=0", + host_cxx_compiler, + when=stdcxx_compat, +) + + +# Support various fuzzing options +# ============================================================== +option("--enable-fuzzing", help="Enable fuzzing support") + + +@depends(build_project) +def js_build(build_project): + return build_project == "js" + + +option( + "--enable-js-fuzzilli", + when=js_build, + help="Enable fuzzilli support for the JS engine", +) + + +option( + "--enable-snapshot-fuzzing", + help="Enable experimental snapshot fuzzing support", +) + + +imply_option("--enable-fuzzing", True, when="--enable-snapshot-fuzzing") + + +@depends("--enable-snapshot-fuzzing") +def enable_snapshot_fuzzing(value): + if value: + return True + + +@depends("--enable-fuzzing", enable_snapshot_fuzzing) +def enable_fuzzing(value, snapshot_fuzzing): + if value or snapshot_fuzzing: + return True + + +@depends("--enable-js-fuzzilli", when=js_build) +def enable_js_fuzzilli(value): + if value: + return True + + +@depends(enable_fuzzing, enable_snapshot_fuzzing) +def check_aflfuzzer(fuzzing, snapshot_fuzzing): + if fuzzing and not snapshot_fuzzing: + return True + + +@depends( + try_compile( + body="__AFL_COMPILER;", check_msg="for AFL compiler", when=check_aflfuzzer + ) +) +def enable_aflfuzzer(afl): + if afl: + return True + + +@depends(enable_fuzzing, enable_aflfuzzer, enable_snapshot_fuzzing, c_compiler, target) +def enable_libfuzzer(fuzzing, afl, snapshot_fuzzing, c_compiler, target): + if ( + fuzzing + and not afl + and not snapshot_fuzzing + and c_compiler.type == "clang" + and target.os != "Android" + ): + return True + + +@depends(enable_fuzzing, enable_aflfuzzer, enable_libfuzzer, enable_js_fuzzilli) +def enable_fuzzing_interfaces(fuzzing, afl, libfuzzer, enable_js_fuzzilli): + if fuzzing and (afl or libfuzzer) and not enable_js_fuzzilli: + return True + + +set_config("FUZZING", enable_fuzzing) +set_define("FUZZING", enable_fuzzing) + +set_config("LIBFUZZER", enable_libfuzzer) +set_define("LIBFUZZER", enable_libfuzzer) +add_old_configure_assignment("LIBFUZZER", enable_libfuzzer) + +set_config("AFLFUZZ", enable_aflfuzzer) +set_define("AFLFUZZ", enable_aflfuzzer) + +set_config("FUZZING_INTERFACES", enable_fuzzing_interfaces) +set_define("FUZZING_INTERFACES", enable_fuzzing_interfaces) +add_old_configure_assignment("FUZZING_INTERFACES", enable_fuzzing_interfaces) + +set_config("FUZZING_JS_FUZZILLI", enable_js_fuzzilli) +set_define("FUZZING_JS_FUZZILLI", enable_js_fuzzilli) + +set_config("FUZZING_SNAPSHOT", enable_snapshot_fuzzing) +set_define("FUZZING_SNAPSHOT", enable_snapshot_fuzzing) + + +@depends( + c_compiler.try_compile( + flags=["-fsanitize=fuzzer-no-link"], + when=enable_fuzzing, + check_msg="whether the C compiler supports -fsanitize=fuzzer-no-link", + ), + tsan, + enable_js_fuzzilli, +) +def libfuzzer_flags(value, tsan, enable_js_fuzzilli): + if tsan: + # With ThreadSanitizer, we should not use any libFuzzer instrumentation because + # it is incompatible (e.g. there are races on global sanitizer coverage counters). + # Instead we use an empty set of flags here but still build the fuzzing targets. + # With this setup, we can still run files through these targets in TSan builds, + # e.g. those obtained from regular fuzzing. + # This code can be removed once libFuzzer has been made compatible with TSan. + # + # Also, this code needs to be kept in sync with certain gyp files, currently: + # - dom/media/webrtc/transport/third_party/nICEr/nicer.gyp + return namespace(no_link_flag_supported=False, use_flags=[]) + + if enable_js_fuzzilli: + # Fuzzilli comes with its own trace-pc interceptors and flag requirements. + no_link_flag_supported = False + use_flags = ["-fsanitize-coverage=trace-pc-guard", "-g"] + elif value: + no_link_flag_supported = True + # recommended for (and only supported by) clang >= 6 + use_flags = ["-fsanitize=fuzzer-no-link"] + else: + no_link_flag_supported = False + use_flags = ["-fsanitize-coverage=trace-pc-guard,trace-cmp"] + + return namespace( + no_link_flag_supported=no_link_flag_supported, + use_flags=use_flags, + ) + + +set_config("HAVE_LIBFUZZER_FLAG_FUZZER_NO_LINK", libfuzzer_flags.no_link_flag_supported) +set_config("LIBFUZZER_FLAGS", libfuzzer_flags.use_flags) +add_old_configure_assignment("LIBFUZZER_FLAGS", libfuzzer_flags.use_flags) + +# Shared library building +# ============================================================== + + +# XXX: The use of makefile constructs in these variables is awful. +@depends(target, c_compiler) +def make_shared_library(target, compiler): + if target.os == "WINNT": + if compiler.type == "gcc": + return namespace( + mkshlib=["$(CXX)", "$(DSO_LDOPTS)", "-o", "$@"], + mkcshlib=["$(CC)", "$(DSO_LDOPTS)", "-o", "$@"], + ) + elif compiler.type == "clang": + return namespace( + mkshlib=[ + "$(CXX)", + "$(DSO_LDOPTS)", + "-Wl,-pdb,$(LINK_PDBFILE)", + "-o", + "$@", + ], + mkcshlib=[ + "$(CC)", + "$(DSO_LDOPTS)", + "-Wl,-pdb,$(LINK_PDBFILE)", + "-o", + "$@", + ], + ) + else: + linker = [ + "$(LINKER)", + "-NOLOGO", + "-DLL", + "-OUT:$@", + "-PDB:$(LINK_PDBFILE)", + "$(DSO_LDOPTS)", + ] + return namespace( + mkshlib=linker, + mkcshlib=linker, + ) + + cc = ["$(CC)", "$(COMPUTED_C_LDFLAGS)"] + cxx = ["$(CXX)", "$(COMPUTED_CXX_LDFLAGS)"] + flags = ["$(DSO_LDOPTS)"] + output = ["-o", "$@"] + + if target.kernel == "Darwin": + soname = [] + elif target.os == "NetBSD": + soname = ["-Wl,-soname,$(DSO_SONAME)"] + else: + assert compiler.type in ("gcc", "clang") + + soname = ["-Wl,-h,$(DSO_SONAME)"] + + return namespace( + mkshlib=cxx + flags + soname + output, + mkcshlib=cc + flags + soname + output, + ) + + +set_config("MKSHLIB", make_shared_library.mkshlib) +set_config("MKCSHLIB", make_shared_library.mkcshlib) + + +@depends(c_compiler, toolchain_prefix, when=target_is_windows) +def rc_names(c_compiler, toolchain_prefix): + if c_compiler.type in ("gcc", "clang"): + return tuple("%s%s" % (p, "windres") for p in ("",) + (toolchain_prefix or ())) + return ("llvm-rc",) + + +check_prog("RC", rc_names, paths=clang_search_path, when=target_is_windows) + + +@template +def ar_config(c_compiler, toolchain_prefix=None): + if not toolchain_prefix: + toolchain_prefix = dependable(None) + + @depends(toolchain_prefix, c_compiler) + def ar_config(toolchain_prefix, c_compiler): + if c_compiler.type == "clang-cl": + return namespace( + names=("llvm-lib",), + flags=("-llvmlibthin", "-out:$@"), + ) + + names = tuple("%s%s" % (p, "ar") for p in (toolchain_prefix or ()) + ("",)) + if c_compiler.type == "clang": + # Get the llvm-ar path as per the output from clang --print-prog-name=llvm-ar + # so that we directly get the one under the clang directory, rather than one + # that might be in /usr/bin and that might point to one from a different version + # of clang. + out = check_cmd_output( + c_compiler.compiler, "--print-prog-name=llvm-ar", onerror=lambda: None + ) + llvm_ar = out.rstrip() if out else "llvm-ar" + names = (llvm_ar,) + names + + return namespace( + names=names, + flags=("crs", "$@"), + ) + + return ar_config + + +target_ar_config = ar_config(c_compiler, toolchain_prefix) + +target_ar = check_prog("AR", target_ar_config.names, paths=clang_search_path) + +set_config("AR_FLAGS", target_ar_config.flags) + + +@depends(c_compiler, extra_toolchain_flags, target_ar, target_ar_config) +@checking("whether ar supports response files") +@imports("os") +@imports(_from="tempfile", _import="mkstemp") +@imports(_from="__builtin__", _import="FileNotFoundError") +@imports(_from="mozbuild.configure.util", _import="LineIO") +def ar_supports_response_files(c_compiler, extra_toolchain_flags, ar, ar_config): + lib_path = list_path = None + try: + fd, obj_path = mkstemp(prefix="conftest.", suffix=".o") + os.close(fd) + if ( + try_invoke_compiler( + # No configure_cache because it would not create the + # expected output file. + None, + [c_compiler.compiler] + c_compiler.flags, + c_compiler.language, + "void foo() {}", + ["-c", "-o", obj_path] + (extra_toolchain_flags or []), + wrapper=c_compiler.wrapper, + onerror=lambda: None, + ) + is not None + ): + fd, list_path = mkstemp(prefix="conftest.", suffix=".list") + with os.fdopen(fd, "w") as list: + list.write(obj_path) + log.debug("Creating `%s` with content:", list_path) + log.debug("| %s", obj_path) + fd, lib_path = mkstemp(prefix="conftest.", suffix=".a") + os.close(fd) + os.remove(lib_path) + ar_command = ( + [ar] + + [x.replace("$@", lib_path) for x in ar_config.flags] + + ["@" + list_path] + ) + result = check_cmd_output(*ar_command, onerror=lambda: None) + return result is not None + finally: + for cleanup_path in (obj_path, list_path, lib_path): + if cleanup_path: + try: + os.remove(cleanup_path) + except FileNotFoundError: + pass + + +set_config("AR_SUPPORTS_RESPONSE_FILE", True, when=ar_supports_response_files) + +host_ar_config = ar_config(host_c_compiler) + +check_prog("HOST_AR", host_ar_config.names, paths=clang_search_path) + + +@depends(toolchain_prefix, c_compiler) +def nm_names(toolchain_prefix, c_compiler): + names = tuple("%s%s" % (p, "nm") for p in (toolchain_prefix or ()) + ("",)) + if c_compiler.type == "clang": + # Get the llvm-nm path as per the output from clang --print-prog-name=llvm-nm + # so that we directly get the one under the clang directory, rather than one + # that might be in /usr/bin and that might point to one from a different version + # of clang. + out = check_cmd_output( + c_compiler.compiler, "--print-prog-name=llvm-nm", onerror=lambda: None + ) + llvm_nm = out.rstrip() if out else "llvm-nm" + names = (llvm_nm,) + names + + return names + + +check_prog("NM", nm_names, paths=clang_search_path, when=target_has_linux_kernel) + + +option("--enable-cpp-rtti", help="Enable C++ RTTI") + +add_old_configure_assignment("_MOZ_USE_RTTI", "1", when="--enable-cpp-rtti") + + +option( + "--enable-path-remapping", + nargs="*", + choices=("c", "rust"), + help="Enable remapping source and object paths in compiled outputs.", +) + + +@depends("--enable-path-remapping") +def path_remapping(value): + if len(value): + return value + if bool(value): + return ["c", "rust"] + return [] + + +@depends( + target, + build_environment, + target_sysroot.path, + valid_windows_sdk_dir, + vc_path, + when="--enable-path-remapping", +) +def path_remappings(target, build_env, sysroot_path, windows_sdk_dir, vc_path): + win = target.kernel == "WINNT" + + # The prefix maps are processed in the order they're specified on the + # command line. Therefore, to accommodate object directories in the source + # directory, it's important that we map the topobjdir before the topsrcdir, + # 'cuz we might have /src/obj/=/o/ and /src/=/s/. The various other + # directories might be subdirectories of topsrcdir as well, so they come + # earlier still. + + path_remappings = [] + + # We will have only one sysroot or SDK, so all can have the same mnemonic: K + # for "kit" (since S is taken for "source"). See + # https://blog.llvm.org/2019/11/deterministic-builds-with-clang-and-lld.html + # for how to use the Windows `subst` command to map these in debuggers and + # IDEs. + if sysroot_path: + path_remappings.append((sysroot_path, "k:/" if win else "/sysroot/")) + if windows_sdk_dir: + path_remappings.append( + (windows_sdk_dir.path, "k:/" if win else "/windows_sdk/") + ) + if vc_path: + path_remappings.append((vc_path, "v:/" if win else "/vc/")) + + path_remappings += [ + (build_env.topobjdir, "o:/" if win else "/topobjdir/"), + (build_env.topsrcdir, "s:/" if win else "/topsrcdir/"), + ] + + path_remappings = [ + (normsep(old).rstrip("/") + "/", new) for old, new in path_remappings + ] + + # It is tempting to sort these, but we want the order to be the same across + # machines so that we can share cache hits. Therefore we reject bad + # configurations rather than trying to make the configuration good. + for i in range(len(path_remappings) - 1): + p = path_remappings[i][0] + for q, _ in path_remappings[i + 1 :]: + if q.startswith(p): + die(f"Cannot remap paths because {p} is an ancestor of {q}") + + return path_remappings + + +set_config("MMX_FLAGS", ["-mmmx"]) +set_config("SSE_FLAGS", ["-msse"]) +set_config("SSE2_FLAGS", ["-msse2"]) +set_config("SSSE3_FLAGS", ["-mssse3"]) +set_config("SSE4_2_FLAGS", ["-msse4.2"]) +set_config("FMA_FLAGS", ["-mfma"]) +set_config("AVX2_FLAGS", ["-mavx2"]) +set_config( + "AVXVNNI_FLAGS", + ["-mavxvnni"], + try_compile(check_msg="for -mavxvnni support", flags=["-mavxvnni"]), +) +set_config( + "AVX512BW_FLAGS", + ["-mavx512bw", "-mavx512f", "-mavx512dq", "-mavx512cd"], + try_compile( + check_msg="for -mavx512bw support", + flags=["-mavx512bw", "-mavx512f", "-mavx512dq", "-mavx512cd"], + ), +) + +# AVX512VNNI can be based on either avx512bw or avx512vbmi. We choose the +# former. +set_config( + "AVX512VNNI_FLAGS", + ["-mavx512vnni", "-mavx512bw", "-mavx512f", "-mavx512dq", "-mavx512cd"], + try_compile( + check_msg="for -mavx512vnni support", + flags=["-mavx512vnni", "-mavx512bw", "-mavx512f", "-mavx512dq", "-mavx512cd"], + ), +) |