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SUSE: Disable the following:
* Optimizer flags. Anything other than straight -O2 isn't well tested (either more or less optimization)
* -flto still needs to be handled by gn as it needs to be disabled for some targets,
and global CFLAGS go at the end of the commandline
* Submodel options (-march and friends). Upstream notoriously forces SSE3 despite the code not requiring it.
* note that cpu options for ARM are currently left in, as they do not seem to do harm and V8 needs to know the exact target anyway
* Debuginfo format. Upstream seems to force something that is not recognized by rpmbuild.
* per-target debuginfo level is left in as it is still useful (-g2 everywhere does not work)
* Emitting code for the PIC model. It is needed in case of shared libraries, but results in a larger executable (and Electron is already enormous)
It should be enabled individually on code that gets into separate libraries (and we know when to do it — otherwise we're getting linker error)
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* -rdynamic. The rationale given is bogus (the allocator gets exported regardless). The main executable needs to be linked with -rdynamic anyway, but eg. chrome_crashpad_handler doesn't.
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From 307a0f63dd9b118f4b8470ed3d7567e81fdb7a6d Mon Sep 17 00:00:00 2001
2021-06-29 20:42:56 +00:00
From: Mike Gilbert <floppym@gentoo.org>
2022-07-04 09:07:38 +00:00
Date: Fri, 22 Apr 2022 09:05:24 +0000
2021-06-29 20:42:56 +00:00
Subject: [PATCH] Disable various compiler configs
---
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build/config/compiler/BUILD.gn | 114 +++++----------------------------
1 file changed, 17 insertions(+), 97 deletions(-)
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diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
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index d40843b..b92f03b 100644
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--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
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@@ -274,9 +274,7 @@
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configs += [
# See the definitions below.
- ":clang_revision",
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":rustc_revision",
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- ":compiler_cpu_abi",
":compiler_codegen",
":compiler_deterministic",
]
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@@ -305,7 +303,12 @@
if (!is_win) {
# Common POSIX compiler flags setup.
# --------------------------------
- cflags += [ "-fno-strict-aliasing" ] # See http://crbug.com/32204
+ # To future SUSE maintainers: Do not re-enable this, you will save yourself hours of debugging!
+ # This is an optimizer flag, not a C dialect flag to make GCC behave like clang.
+ # Despite what the -Wlto-type-mismatch warning text tells you, enabling this will NOT fix miscompiles,
+ # and seems to cause other problems in GCC12. See https://bugs.chromium.org/p/chromium/issues/detail?id=1373615#c6
+ # ANY BUGS DUE TO ALIASING SHOULD BE FIXED IN CODE, AND THE PATCHES SENT UPSTREAM!
+ # cflags += [ "-fno-strict-aliasing" ] # See http://crbug.com/32204
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# Stack protection. ShadowCallStack and Stack protector address the same
# problems. Therefore, we only enable one or the other. Clang advertises SCS as
@@ -432,10 +435,6 @@
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# Linux/Android/Fuchsia common flags setup.
# ---------------------------------
if (is_linux || is_chromeos || is_android || is_fuchsia) {
- asmflags += [ "-fPIC" ]
- cflags += [ "-fPIC" ]
- ldflags += [ "-fPIC" ]
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- rustflags += [ "-Crelocation-model=pic" ]
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if (!is_clang) {
# Use pipes for communicating between sub-processes. Faster.
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@@ -527,55 +527,6 @@
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ldflags += [ "-Wl,-z,keep-text-section-prefix" ]
}
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- if (is_clang && !is_nacl && current_os != "zos") {
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- cflags += [ "-fcrash-diagnostics-dir=" + clang_diagnostic_dir ]
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- if (save_reproducers_on_lld_crash && use_lld) {
- ldflags += [
- "-fcrash-diagnostics=all",
- "-fcrash-diagnostics-dir=" + clang_diagnostic_dir,
- ]
- }
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-
- # 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" ]
- }
- }
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-
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- # TODO(crbug.com/1488374): This causes binary size growth and potentially
- # other problems.
- # TODO(crbug.com/1491036): 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" ]
- }
- }
- }
-
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- # TODO(crbug.com/1235145): Investigate why/if this should be needed.
- if (is_win) {
- cflags += [ "/clang:-ffp-contract=off" ]
- } else {
- cflags += [ "-ffp-contract=off" ]
- }
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- }
-
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# C11/C++11 compiler flags setup.
# ---------------------------
if (is_linux || is_chromeos || is_android || (is_nacl && is_clang) ||
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@@ -862,7 +837,8 @@
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# without using everything that "compiler" brings in. Options that
# tweak code generation for a particular CPU do not belong here!
# See "compiler_codegen", below.
-config("compiler_cpu_abi") {
+config("compiler_cpu_abi") { }
+config("xcompiler_cpu_abi") {
cflags = []
ldflags = []
defines = []
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@@ -1227,46 +1203,6 @@
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}
}
- # 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=." ]
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- swiftflags += [ "-file-compilation-dir=." ]
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- }
- 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 goma cache entries.
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@@ -1400,7 +1337,8 @@
# Collects all warning flags that are used by default. This is used as a
# subconfig of both chromium_code and no_chromium_code. This way these
# flags are guaranteed to appear on the compile command line after -Wall.
-config("default_warnings") {
+config("default_warnings") { }
+config("xdefault_warnings") {
cflags = []
cflags_c = []
cflags_cc = []
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@@ -1597,11 +1535,7 @@
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defines = [ "_HAS_NODISCARD" ]
}
} else {
- cflags = [ "-Wall" ]
+ cflags = []
- if (is_clang) {
- # Enable extra warnings for chromium_code when we control the compiler.
- cflags += [ "-Wextra" ]
- }
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# In Chromium code, we define __STDC_foo_MACROS in order to get the
# C99 macros on Mac and Linux.
@@ -1618,24 +1552,6 @@
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"__STDC_FORMAT_MACROS",
]
- if (!is_debug && !using_sanitizer && current_cpu != "s390x" &&
- current_cpu != "s390" && current_cpu != "ppc64" &&
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- current_cpu != "mips" && current_cpu != "mips64" &&
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- current_cpu != "riscv64" && current_cpu != "loong64") {
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- # 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.
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- fortify_level = "2"
-
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- # 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) {
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- fortify_level = "3"
- }
- defines += [ "_FORTIFY_SOURCE=" + fortify_level ]
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- }
-
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if (is_apple) {
cflags_objc = [ "-Wimplicit-retain-self" ]
cflags_objcc = [ "-Wimplicit-retain-self" ]
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@@ -1841,7 +1841,6 @@
config("export_dynamic") {
# TODO(crbug.com/1052397): Revisit after target_os flip is completed.
if (is_linux || is_chromeos_lacros || export_libcxxabi_from_executables) {
- ldflags = [ "-rdynamic" ]
}
}
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@@ -1887,7 +1811,8 @@
# gcc 4.9 and earlier had no way of suppressing this warning without
# suppressing the rest of them. Here we centralize the identification of
# the gcc 4.9 toolchains.
-config("no_incompatible_pointer_warnings") {
+config("no_incompatible_pointer_warnings") { }
+config("xno_incompatible_pointer_warnings") {
cflags = []
if (is_clang) {
cflags += [ "-Wno-incompatible-pointer-types" ]
@@ -1990,7 +1915,8 @@
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common_optimize_on_cflags += [ "-fno-math-errno" ]
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}
-config("default_stack_frames") {
+config("default_stack_frames") { }
+config("xdefault_stack_frames") {
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if (!is_win) {
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if (enable_frame_pointers) {
cflags = [ "-fno-omit-frame-pointer" ]
@@ -2017,7 +1943,8 @@
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}
# Default "optimization on" config.
-config("optimize") {
+config("optimize") { }
+config("xoptimize") {
if (is_win) {
if (chrome_pgo_phase != 2) {
# Favor size over speed, /O1 must be before the common flags.
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@@ -2055,7 +1982,8 @@
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}
# Turn off optimizations.
-config("no_optimize") {
+config("no_optimize") { }
+config("xno_optimize") {
if (is_win) {
cflags = [
"/Od", # Disable optimization.
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@@ -2095,7 +2023,8 @@
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# Turns up the optimization level. On Windows, this implies whole program
# optimization and link-time code generation which is very expensive and should
# be used sparingly.
-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:
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@@ -2128,7 +2057,8 @@
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#
# TODO(crbug.com/621335) - 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:
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@@ -2154,7 +2084,8 @@
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}
}
-config("optimize_fuzzing") {
+config("optimize_fuzzing") { }
+config("xoptimize_fuzzing") {
cflags = [ "-O1" ] + common_optimize_on_cflags
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rustflags = [ "-Copt-level=1" ]
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ldflags = common_optimize_on_ldflags
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@@ -2273,7 +2204,8 @@
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}
# Full symbols.
-config("symbols") {
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+config("symbols") { cflags = ["-g2"] }
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+config("xsymbols") {
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rustflags = []
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if (is_win) {
if (is_clang) {
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@@ -2398,7 +2330,8 @@
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# 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") {
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+config("minimal_symbols") { cflags = ["-g1"] }
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+config("xminimal_symbols") {
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rustflags = []
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if (is_win) {
# Functions, files, and line tables only.
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@@ -2470,7 +2403,8 @@
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# 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") {
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+config("no_symbols") { cflags = ["-g0"]}
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+config("xno_symbols") {
if (is_win) {
ldflags = [ "/DEBUG" ]
