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chromium-dev/chromium-125-compiler.patch

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From 307a0f63dd9b118f4b8470ed3d7567e81fdb7a6d Mon Sep 17 00:00:00 2001
From: Mike Gilbert <floppym@gentoo.org>
Date: Tue, 15 Nov 2022 10:27:58 +0000
Subject: [PATCH] Disable various compiler configs
---
build/config/compiler/BUILD.gn | 134 +++++----------------------------
1 file changed, 17 insertions(+), 117 deletions(-)
Index: chromium-126.0.6478.8/build/config/compiler/BUILD.gn
===================================================================
--- chromium-126.0.6478.8.orig/build/config/compiler/BUILD.gn
+++ chromium-126.0.6478.8/build/config/compiler/BUILD.gn
@@ -305,9 +305,7 @@ config("compiler") {
configs += [
# See the definitions below.
- ":clang_revision",
":rustc_revision",
- ":compiler_cpu_abi",
":compiler_codegen",
":compiler_deterministic",
]
@@ -566,63 +566,6 @@
ldflags += [ "-Wl,-z,keep-text-section-prefix" ]
}
- if (is_clang && !is_nacl) {
- cflags += [ "-fcrash-diagnostics-dir=" + clang_diagnostic_dir ]
- if (save_reproducers_on_lld_crash && use_lld) {
- ldflags += [
- "-fcrash-diagnostics=all",
- "-fcrash-diagnostics-dir=" + clang_diagnostic_dir,
- ]
- }
-
- # TODO(hans): Remove this once Clang generates better optimized debug info
- # by default. https://crbug.com/765793
- cflags += [
- "-mllvm",
- "-instcombine-lower-dbg-declare=0",
- ]
- if (!is_debug && use_thin_lto && is_a_target_toolchain) {
- if (is_win) {
- ldflags += [ "-mllvm:-instcombine-lower-dbg-declare=0" ]
- } else {
- ldflags += [ "-Wl,-mllvm,-instcombine-lower-dbg-declare=0" ]
- }
- }
-
- # TODO(crbug.com/40283598): This causes binary size growth and potentially
- # other problems.
- # TODO(crbug.com/40284925): This isn't supported by Cronet's mainline llvm version.
- if (default_toolchain != "//build/toolchain/cros:target" &&
- !llvm_android_mainline) {
- cflags += [
- "-mllvm",
- "-split-threshold-for-reg-with-hint=0",
- ]
- if (use_thin_lto && is_a_target_toolchain) {
- if (is_win) {
- ldflags += [ "-mllvm:-split-threshold-for-reg-with-hint=0" ]
- } else {
- ldflags += [ "-Wl,-mllvm,-split-threshold-for-reg-with-hint=0" ]
- }
- }
- }
-
- # TODO(crbug.com/40192287): Investigate why/if this should be needed.
- if (is_win) {
- cflags += [ "/clang:-ffp-contract=off" ]
- } else {
- cflags += [ "-ffp-contract=off" ]
- }
-
- # Enable ELF CREL (see crbug.com/357878242) for all platforms that use ELF
- # (excluding toolchains that use an older version of LLVM).
- # TODO(crbug.com/376278218): This causes segfault on Linux ARM builds.
- if (is_linux && !llvm_android_mainline && current_cpu != "arm" &&
- default_toolchain != "//build/toolchain/cros:target") {
- cflags += [ "-Wa,--crel,--allow-experimental-crel" ]
- }
- }
-
# C11/C++11 compiler flags setup.
# ---------------------------
if (is_linux || is_chromeos || is_android || (is_nacl && is_clang) ||
@@ -1538,52 +1489,6 @@ config("compiler_deterministic") {
}
}
- # Makes builds independent of absolute file path.
- if (is_clang && strip_absolute_paths_from_debug_symbols) {
- # If debug option is given, clang includes $cwd in debug info by default.
- # For such build, this flag generates reproducible obj files even we use
- # different build directory like "out/feature_a" and "out/feature_b" if
- # we build same files with same compile flag.
- # Other paths are already given in relative, no need to normalize them.
- if (is_nacl) {
- # TODO(https://crbug.com/1231236): Use -ffile-compilation-dir= here.
- cflags += [
- "-Xclang",
- "-fdebug-compilation-dir",
- "-Xclang",
- ".",
- ]
- } else {
- # -ffile-compilation-dir is an alias for both -fdebug-compilation-dir=
- # and -fcoverage-compilation-dir=.
- cflags += [ "-ffile-compilation-dir=." ]
-
- # Convert absolute paths to relative paths. Expands to, for example:
- # -file-prefix-map /path/to/chromium/src=../..
- swiftflags += [
- "-file-prefix-map",
- rebase_path("//.", "") + "=" + rebase_path("//.", root_build_dir),
- ]
- }
- if (!is_win) {
- # We don't use clang -cc1as on Windows (yet? https://crbug.com/762167)
- asmflags = [ "-Wa,-fdebug-compilation-dir,." ]
- }
-
- if (is_win && use_lld) {
- if (symbol_level == 2 || (is_clang && using_sanitizer)) {
- # Absolutize source file paths for PDB. Pass the real build directory
- # if the pdb contains source-level debug information and if linker
- # reproducibility is not critical.
- ldflags += [ "/PDBSourcePath:" + rebase_path(root_build_dir) ]
- } else {
- # Use a fake fixed base directory for paths in the pdb to make the pdb
- # output fully deterministic and independent of the build directory.
- ldflags += [ "/PDBSourcePath:o:\fake\prefix" ]
- }
- }
- }
-
# Tells the compiler not to use absolute paths when passing the default
# paths to the tools it invokes. We don't want this because we don't
# really need it and it can mess up the RBE cache entries.
@@ -1602,28 +1507,6 @@ config("compiler_deterministic") {
}
}
-config("clang_revision") {
- if (is_clang && clang_base_path == default_clang_base_path &&
- current_os != "zos") {
- update_args = [
- "--print-revision",
- "--verify-version=$clang_version",
- ]
- if (llvm_force_head_revision) {
- update_args += [ "--llvm-force-head-revision" ]
- }
- clang_revision = exec_script("//tools/clang/scripts/update.py",
- update_args,
- "trim string")
-
- # This is here so that all files get recompiled after a clang roll and
- # when turning clang on or off. (defines are passed via the command line,
- # and build system rebuild things when their commandline changes). Nothing
- # should ever read this define.
- defines = [ "CR_CLANG_REVISION=\"$clang_revision\"" ]
- }
-}
-
config("rustc_revision") {
if (rustc_revision != "") {
# Similar to the above config, this is here so that all files get recompiled
@@ -1983,10 +1871,6 @@ config("chromium_code") {
}
} else {
cflags = [ "-Wall" ]
- if (is_clang) {
- # Enable extra warnings for chromium_code when we control the compiler.
- cflags += [ "-Wextra" ]
- }
# In Chromium code, we define __STDC_foo_MACROS in order to get the
# C99 macros on Mac and Linux.
@@ -1995,24 +1879,6 @@ config("chromium_code") {
"__STDC_FORMAT_MACROS",
]
- if (!is_debug && !using_sanitizer && current_cpu != "s390x" &&
- current_cpu != "s390" && current_cpu != "ppc64" &&
- current_cpu != "mips" && current_cpu != "mips64" &&
- current_cpu != "riscv64" && current_cpu != "loong64") {
- # Non-chromium code is not guaranteed to compile cleanly with
- # _FORTIFY_SOURCE. Also, fortified build may fail when optimizations are
- # disabled, so only do that for Release build.
- fortify_level = "2"
-
- # ChromeOS's toolchain supports a high-quality _FORTIFY_SOURCE=3
- # implementation with a few custom glibc patches. Use that if it's
- # available.
- if (is_chromeos_device && !lacros_use_chromium_toolchain) {
- fortify_level = "3"
- }
- defines += [ "_FORTIFY_SOURCE=" + fortify_level ]
- }
-
if (is_apple) {
cflags_objc = [ "-Wimplicit-retain-self" ]
cflags_objcc = [ "-Wimplicit-retain-self" ]
@@ -2442,7 +2325,8 @@ config("default_stack_frames") {
# [0]: https://pinpoint-dot-chromeperf.appspot.com/job/147634a8be0000
# [1]: https://pinpoint-dot-chromeperf.appspot.com/job/132bc772be0000
# [2]: https://crrev.com/c/5447532
-config("optimize") {
+config("optimize") { }
+config("xoptimize") {
if (is_win) {
# clang-cl's /O2 corresponds to clang's -O3, and really want -O2 for
# consistency with the other platforms.
@@ -2450,7 +2317,8 @@ config("optimize") {
}
# Turn off optimizations.
-config("no_optimize") {
+config("no_optimize") { }
+config("xno_optimize") {
if (is_win) {
cflags = [
"/Od", # Disable optimization.
@@ -2490,7 +2358,8 @@ config("no_optimize") {
# Turns up the optimization level. Used to explicitly enable -O2 instead of
# -Os for select targets on platforms that use optimize_for_size. No-op
# elsewhere.
-config("optimize_max") {
+config("optimize_max") { }
+config("xoptimize_max") {
if (is_nacl && is_nacl_irt) {
# The NaCl IRT is a special case and always wants its own config.
# Various components do:
@@ -2523,7 +2392,8 @@ config("optimize_max") {
#
# TODO(crbug.com/41259697) - rework how all of these configs are related
# so that we don't need this disclaimer.
-config("optimize_speed") {
+config("optimize_speed") { }
+config("xoptimize_speed") {
if (is_nacl && is_nacl_irt) {
# The NaCl IRT is a special case and always wants its own config.
# Various components do:
@@ -2552,7 +2422,8 @@ config("optimize_speed") {
}
}
-config("optimize_fuzzing") {
+config("optimize_fuzzing") { }
+config("xoptimize_fuzzing") {
cflags = [ "-O1" ] + common_optimize_on_cflags
rustflags = [ "-Copt-level=1" ]
ldflags = common_optimize_on_ldflags
@@ -2685,7 +2556,8 @@ config("win_pdbaltpath") {
}
# Full symbols.
-config("symbols") {
+config("symbols") { }
+config("xsymbols") {
rustflags = []
configs = []
if (is_win) {
@@ -2835,7 +2707,8 @@ config("symbols") {
# Minimal symbols.
# This config guarantees to hold symbol for stack trace which are shown to user
# when crash happens in unittests running on buildbot.
-config("minimal_symbols") {
+config("minimal_symbols") { }
+config("xminimal_symbols") {
rustflags = []
if (is_win) {
# Functions, files, and line tables only.
@@ -2920,7 +2793,8 @@ config("minimal_symbols") {
# This configuration contains function names only. That is, the compiler is
# told to not generate debug information and the linker then just puts function
# names in the final debug information.
-config("no_symbols") {
+config("no_symbols") { }
+config("xno_symbols") {
if (is_win) {
ldflags = [ "/DEBUG" ]
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