summaryrefslogtreecommitdiffstats
path: root/build/moz.configure/flags.configure
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--build/moz.configure/flags.configure145
1 files changed, 145 insertions, 0 deletions
diff --git a/build/moz.configure/flags.configure b/build/moz.configure/flags.configure
new file mode 100644
index 0000000000..d5526dc930
--- /dev/null
+++ b/build/moz.configure/flags.configure
@@ -0,0 +1,145 @@
+# -*- Mode: python; c-basic-offset: 4; 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/.
+
+# We support C++14, but we don't want to enable the sized deallocation
+# facilities in C++14 yet.
+check_and_add_flag("-fno-sized-deallocation", compiler=cxx_compiler)
+# Likewise for C++17 and aligned allocation. It's not immediately obvious
+# from the clang and GCC documentation, but they both support this.
+check_and_add_flag("-fno-aligned-new", compiler=cxx_compiler)
+
+# Please keep these last in this file.
+add_old_configure_assignment("_COMPILATION_CFLAGS", compilation_flags.cflags)
+add_old_configure_assignment("_COMPILATION_CXXFLAGS", compilation_flags.cxxflags)
+add_old_configure_assignment("_COMPILATION_HOST_CFLAGS", compilation_flags.host_cflags)
+add_old_configure_assignment(
+ "_COMPILATION_HOST_CXXFLAGS", compilation_flags.host_cxxflags
+)
+
+
+option(
+ "--disable-new-pass-manager",
+ help="Use the legacy LLVM pass manager in clang builds",
+)
+
+
+@depends(
+ "--enable-new-pass-manager",
+ c_compiler,
+ host,
+ target,
+ "MOZ_PGO",
+ enable_fuzzing,
+ ubsan,
+)
+def pass_manager(enabled, compiler, host, target, pgo, enable_fuzzing, ubsan):
+ if compiler.type not in ("clang", "clang-cl"):
+ return None
+
+ # As of clang 13, the default pass manager is the new one.
+ if compiler.version >= "13.0.0":
+ if enabled:
+ return namespace(flags=None, enabled=True)
+ if compiler.type == "clang":
+ return namespace(flags=["-flegacy-pass-manager"], enabled=False)
+ if compiler.type == "clang-cl":
+ return namespace(flags=["-Xclang", "-flegacy-pass-manager"], enabled=False)
+
+ if not enabled:
+ if compiler.version >= "15.0.0":
+ die("--disable-new-pass-manager is only supported with clang < 15")
+ return None
+ if compiler.version < "9.0.0":
+ if enabled.origin != "default":
+ die("--enable-new-pass-manager is only supported with clang >= 9")
+ return None
+
+ if host.os == "OSX":
+ # Some native Mac builds hang with the new pass manager. Given the
+ # inability to test in CI, don't take the risk of further breakage.
+ if enabled.origin != "default":
+ die(
+ "--enable-new-pass-manager causes problems on mac hosts with clang < 13"
+ )
+ return None
+ if target.os == "OSX" and not pgo:
+ # Also disable when cross-compiling to Mac, because plain-ish opt
+ # builds hang. Variants like asan and ccov work fine, but it would be
+ # too tedious to test them all here. PGO is the only thing that matters
+ # enough to make an exception for.
+ if enabled.origin != "default":
+ die(
+ "--enable-new-pass-manager causes problems on mac builds with clang < 13"
+ )
+ return None
+ if enable_fuzzing and compiler.version < "10.0.0":
+ # Clang 9 does not seem to play well with libFuzzer
+ if enabled.origin != "default":
+ die(
+ "--enable-new-pass-manager causes problems on fuzzing builds with clang < 10"
+ )
+ return None
+ if ubsan and compiler.version == "10.0.0":
+ # Clang 10.0.0 hangs with some ubsan-inserted code constructs.
+ # This was fixed in 10.0.1 (https://llvm.org/pr45835)
+ if enabled.origin != "default":
+ die(
+ "--enable-new-pass-manager causes problems with ubsan builds with clang 10.0.0"
+ )
+ return None
+ if compiler.type == "clang":
+ return namespace(flags=["-fexperimental-new-pass-manager"], enabled=True)
+ elif compiler.type == "clang-cl":
+ return namespace(
+ flags=["-Xclang", "-fexperimental-new-pass-manager"], enabled=True
+ )
+
+
+set_config("MOZ_PASS_MANAGER_FLAGS", pass_manager.flags)
+
+
+# Try to make builds more reproducible and allow sharing built artifacts across
+# source and object directories by using -ffile-prefix-map and friends. To
+# "unwind" the prefix maps, use:
+#
+# (gdb) set substitute-path /topsrcdir/ $topsrcdir/
+#
+# (lldb) settings set target.source-map /topobjdir/ $topobjdir/
+#
+# See, for example, https://lldb.llvm.org/use/map.html.
+@depends(
+ path_remapping,
+ path_remappings,
+ c_compiler,
+)
+@imports(_from="os", _import="sep")
+def file_prefix_map_flags(path_remapping, path_remappings, compiler):
+ if "c" not in path_remapping:
+ return []
+
+ if (compiler.type == "gcc" and compiler.version < "8.1") or (
+ compiler.type in ("clang", "clang-cl") and compiler.version < "10.0.0"
+ ):
+ die(
+ f"Compiler of type {compiler.type} and version {compiler.version} "
+ "does not support --enable-path-remapping."
+ )
+
+ flags = []
+ for old, new in path_remappings:
+ # We would prefer to use just -ffile-prefix-map, but clang-cl doesn't
+ # seem to recognize it.
+ for flag in ("-fdebug-prefix-map", "-fmacro-prefix-map"):
+ flag = f"{flag}={old}={new}"
+ if compiler.type in ("gcc", "clang"):
+ flags.append(flag)
+ elif compiler.type == "clang-cl":
+ flags.extend(["-Xclang", flag])
+
+ return flags
+
+
+set_config("MOZ_FILE_PREFIX_MAP_FLAGS", file_prefix_map_flags)