339 lines
10 KiB
Plaintext
339 lines
10 KiB
Plaintext
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# Copyright (c) 2013 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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# Base compiler configuration.
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config("compiler") {
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includes = [ "//" ]
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if (is_win) {
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cflags = [
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# TODO(brettw) these probably need to be refactored.
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"/Od", "/WX", "/Zi", "/Gy", "/GS", "/RTC1", "/EHsc",
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]
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} else {
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# Common GCC compiler flags setup.
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# --------------------------------
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cflags = [
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"-fno-strict-aliasing", # See http://crbug.com/32204
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"-fvisibility=hidden",
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"-g", # Debug symbols.
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]
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cflags_c = [
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]
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cflags_cc = [
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"-fno-exceptions",
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"-fno-threadsafe-statics",
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"-fvisibility-inlines-hidden",
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]
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ldflags = [
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"-Wl,-z,now",
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"-Wl,-z,relro",
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]
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# Optimization.
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if (is_debug) {
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cflags += [
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"-O0" # No optimization.
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]
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} else {
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# TODO(brettw) release optimization.
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}
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# Stack protection.
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# TODO(brettw) why do we have different values for all of these cases?
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if (is_mac) {
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cflags += "-fstack-protector-all"
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} else if (is_chromeos) {
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cflags += "-fstack-protector-strong"
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} else if (is_linux) {
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cflags += [ "-fstack-protector", "--param=ssp-buffer-size=4" ]
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}
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# Mac-specific compiler flags setup.
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# ----------------------------------
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if (is_mac) {
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# These flags are shared between the C compiler and linker.
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common_mac_flags = [
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# TODO(brettw) obviously this arch flag needs to be parameterized.
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"-arch i386",
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# Set which SDK to use.
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# TODO(brettw) this needs to be configurable somehow.
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"-isysroot", "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.7.sdk",
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"-mmacosx-version-min=10.6",
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]
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cflags += common_mac_flags + [
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# Without this, the constructors and destructors of a C++ object inside
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# an Objective C struct won't be called, which is very bad.
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"-fobjc-call-cxx-cdtors",
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]
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cflags_c += [ "-std=c99" ]
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cflags_cc += [ "-std=gnu++11" ]
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ldflags += common_mac_flags + [
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"-L.",
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# TODO(brettW) I don't understand these options.
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"-Wl,-rpath,@loader_path/.",
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"-Wl,-rpath,@loader_path/../../..",
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]
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}
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# Linux-specific compiler flags setup.
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# ------------------------------------
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if (is_linux) {
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cflags += [
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"-fPIC",
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"-pthread",
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"-pipe", # Use pipes for communicating between sub-processes. Faster.
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]
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ldflags += [
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# Use Gold for linking: it is checked out in the source tree.
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"-B$relative_build_to_source_root_dir/third_party/gold",
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"-fPIC",
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"-pthread",
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"-Wl,-z,noexecstack",
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# TODO(brettw) gold linker flags, only target.
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# There seems to be a conflict of --icf and -pie in gold which can
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# generate crashy binaries. As a security measure, -pie takes
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# precendence for now.
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# TODO(brettw) common.gypi has this only for target toolset.
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#"-Wl,--icf=safe",
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"-Wl,--icf=none",
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# TODO(brettw) gold linker flags, only target.
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# Experimentation found that using four linking threads
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# saved ~20% of link time.
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# https://groups.google.com/a/chromium.org/group/chromium-dev/browse_thread/thread/281527606915bb36
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# Only apply this to the target linker, since the host
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# linker might not be gold, but isn't used much anyway.
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"-Wl,--threads",
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"-Wl,--thread-count=4",
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]
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}
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# Clang-specific compiler flags setup.
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# ------------------------------------
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# TODO(brettw) these should be clang-only. For now, make it mac-only since
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# that's where we always use clang.
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if (is_mac) { # if (is_clang) {
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cflags += [
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"-fcolor-diagnostics",
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]
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}
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}
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}
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# runtime_library -------------------------------------------------------------
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#
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# Sets the runtime library and associated options.
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#
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# We don't bother making multiple versions that are toggle-able since there
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# is more than one axis of control (which makes it complicated) and there's
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# no practical reason for anybody to change this since the CRT must agree.
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config("runtime_library") {
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if (is_component_build) {
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# Component mode: dynamic CRT.
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defines = [ "COMPONENT_BUILD" ]
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if (is_win) {
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# Since the library is shared, it requires exceptions or will give errors
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# about things not matching, so keep exceptions on.
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if (is_debug) {
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cflags = [ "/MDd" ]
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} else {
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cflags = [ "/MD" ]
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}
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}
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} else {
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# Static CRT.
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if (is_win) {
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# We don't use exceptions, and when we link statically we can just get
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# rid of them entirely.
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defines = [ "_HAS_EXCEPTIONS=0" ]
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if (is_debug) {
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cflags = [ "/MTd" ]
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} else {
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cflags = [ "/MT" ]
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}
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}
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}
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if (is_win) {
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defines += [
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"__STD_C",
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"__STDC_CONSTANT_MACROS",
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"__STDC_FORMAT_MACROS",
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"_CRT_RAND_S",
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"_CRT_SECURE_NO_DEPRECATE",
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"_SCL_SECURE_NO_DEPRECATE",
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"_UNICODE",
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"UNICODE",
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]
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}
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}
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# chromium_code ---------------------------------------------------------------
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#
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# Toggles between higher and lower warnings for code that is (or isn't)
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# part of Chromium.
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config("chromium_code") {
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if (is_win) {
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cflags = [
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"/W4", # Warning level 4.
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]
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} else {
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cflags = [
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"-Wall",
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"-Werror",
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# GCC turns on -Wsign-compare for C++ under -Wall, but clang doesn't,
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# so we specify it explicitly.
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# TODO(fischman): remove this if http://llvm.org/PR10448 obsoletes it.
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# http://code.google.com/p/chromium/issues/detail?id=90453
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"-Wsign-compare",
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]
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# In Chromium code, we define __STDC_foo_MACROS in order to get the
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# C99 macros on Mac and Linux.
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defines = [
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"__STDC_CONSTANT_MACROS",
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"__STDC_FORMAT_MACROS",
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]
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# TODO(brettw) this should also be enabled on Linux but some files
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# currently fail.
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if (is_mac) {
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cflags += "-Wextra"
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}
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}
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}
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config("no_chromium_code") {
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if (is_win) {
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cflags = [
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"/W3", # Warning level 3.
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"/wd4800", # Disable warning when forcing value to bool.
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]
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defines = [
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"_CRT_NONSTDC_NO_WARNINGS",
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"_CRT_NONSTDC_NO_DEPRECATE",
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]
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}
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}
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# rtti ------------------------------------------------------------------------
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#
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# Allows turning Run-Time Type Identification on or off.
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config("rtti") {
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if (is_win) {
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cflags_cc = [ "/GR" ]
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}
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}
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config("no_rtti") {
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if (is_win) {
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cflags_cc = [ "/GR-" ]
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} else {
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cflags_cc = [ "-fno-rtti" ]
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}
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}
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# Warnings ---------------------------------------------------------------------
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config("default_warnings") {
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if (is_win) {
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# Please keep ordered and add names if you add more.
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cflags = [
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"/wd4018", # Comparing signed and unsigned values.
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"/wd4100", # Unreferenced formal function parameter.
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"/wd4121", # Alignment of a member was sensitive to packing.
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"/wd4125", # Decimal digit terminates octal escape sequence.
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"/wd4127", # Conditional expression is constant.
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"/wd4130", # Logical operation on address of string constant.
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# TODO(brettw) is this necessary? If so, it should probably be on whoever
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# is silly enough to be doing this rather than globally.
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#"/wd4131", # Function uses old-style declarator.
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"/wd4189", # A variable was declared and initialized but never used.
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"/wd4201", # Nonstandard extension used: nameless struct/union.
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"/wd4238", # Nonstandard extension used: class rvalue used as lvalue.
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"/wd4244", # Conversion: possible loss of data.
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"/wd4245", # Conversion: signed/unsigned mismatch,
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"/wd4251", # Class needs to have dll-interface.
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"/wd4310", # Cast truncates constant value.
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"/wd4351", # Elements of array will be default initialized.
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"/wd4355", # 'this' used in base member initializer list.
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"/wd4396", # Inline friend template thing.
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"/wd4428", # Universal character name encountered in source.
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"/wd4481", # Nonstandard extension: override specifier.
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"/wd4503", # Decorated name length exceeded, name was truncated.
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"/wd4505", # Unreferenced local function has been removed.
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"/wd4510", # Default constructor could not be generated.
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"/wd4512", # Assignment operator could not be generated.
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"/wd4530", # Exception handler used, but unwind semantics not enabled.
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"/wd4610", # Class can never be instantiated, constructor required.
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"/wd4611", # C++ object destruction and 'catch'.
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"/wd4701", # Potentially uninitialized local variable name used.
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"/wd4702", # Unreachable code.
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"/wd4706", # Assignment within conditional expression.
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"/wd4819", # Character not in the current code page.
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]
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} else {
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# Common GCC warning setup.
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cflags = [
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# Enables.
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"-Wendif-labels", # Weird old-style text after an #endif.
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# Disables.
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"-Wno-missing-field-initializers", # "struct foo f = {0};"
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"-Wno-unused-parameter", # Unused function parameters.
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"-Wno-write-strings",
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]
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if (is_mac) {
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cflags += [
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"-Wnewline-eof",
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]
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}
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# TODO(brettw) Ones below here should be clang-only when we have a flag
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# for it.
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if (is_mac) { #if (is_clang) {
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cflags += [
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"-Wheader-hygiene",
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# This warns on using ints as initializers for floats in
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# initializer lists (e.g. |int a = f(); CGSize s = { a, a };|),
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# which happens in several places in chrome code. Not sure if
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# this is worth fixing.
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"-Wno-c++11-narrowing",
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# Don't die on dtoa code that uses a char as an array index.
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# This is required solely for base/third_party/dmg_fp/dtoa.cc.
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# TODO(brettw) move this to that project then!
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"-Wno-char-subscripts",
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# Warns on switches on enums that cover all enum values but
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# also contain a default: branch. Chrome is full of that.
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"-Wno-covered-switch-default",
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# Clang considers the `register` keyword as deprecated, but e.g.
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# code generated by flex (used in angle) contains that keyword.
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# http://crbug.com/255186
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"-Wno-deprecated-register",
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# Clang spots more unused functions.
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"-Wno-unused-function",
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# Warns when a const char[] is converted to bool.
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"-Wstring-conversion",
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]
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}
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}
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}
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