blob: 3203df7fc05b2e64c3ed1cd3ea6fb15a39448489 [file] [log] [blame]
# Copyright 2016 Google Inc.
#
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
declare_args() {
extra_asmflags = []
extra_cflags = []
extra_cflags_c = []
extra_cflags_cc = []
extra_ldflags = []
use_PIC = true
malloc = ""
}
if (is_ios) {
if (is_tvos) {
sdk = "appletvos"
if (target_cpu == "x86" || target_cpu == "x64") {
sdk = "appletvsimulator"
}
} else {
sdk = "iphoneos"
if (target_cpu == "x86" || target_cpu == "x64") {
sdk = "iphonesimulator"
}
}
ios_sysroot = exec_script("find_ios_sysroot.py", [ sdk ], "trim string")
}
config("default") {
asmflags = []
cflags = []
cflags_c = []
cflags_cc = []
defines = []
ldflags = []
libs = []
if (werror) {
if (is_win) {
cflags += [ "/WX" ]
} else {
cflags += [ "-Werror" ]
}
}
if (is_win) {
if (is_clang && target_cpu == "arm64") {
cflags += [ "--target=arm64-windows" ]
}
cflags += [
"/bigobj", # Some of our files are bigger than the regular limits.
"/utf-8", # Set Source and Executable character sets to UTF-8.
]
if (is_clang) {
cflags += [ "-fms-compatibility-version=19" ] # 2015
}
defines += [
"_CRT_SECURE_NO_WARNINGS", # Disables warnings about sscanf().
"_HAS_EXCEPTIONS=0", # Disables exceptions in MSVC STL.
"WIN32_LEAN_AND_MEAN",
"NOMINMAX",
]
_include_dirs = [
"$win_vc/Tools/MSVC/$win_toolchain_version/include",
"$win_sdk/Include/$win_sdk_version/shared",
"$win_sdk/Include/$win_sdk_version/ucrt",
"$win_sdk/Include/$win_sdk_version/um",
"$win_sdk/Include/$win_sdk_version/winrt",
]
if (is_clang) {
foreach(dir, _include_dirs) {
cflags += [
"-imsvc",
dir,
]
}
} else {
include_dirs = _include_dirs
}
lib_dirs = [
"$win_sdk/Lib/$win_sdk_version/ucrt/$target_cpu",
"$win_sdk/Lib/$win_sdk_version/um/$target_cpu",
"$win_vc/Tools/MSVC/$win_toolchain_version/lib/$target_cpu",
]
} else {
if (use_PIC) {
cflags += [ "-fPIC" ]
}
cflags += [ "-fstrict-aliasing" ]
cflags_cc += [ "-std=c++14" ]
# The main idea is to slim the exported API, but these flags also improve link time on Mac.
# These would make stack traces worse on Linux, so we don't just set them willy-nilly.
if (is_component_build || is_ios || is_mac) {
cflags += [ "-fvisibility=hidden" ]
cflags_cc += [ "-fvisibility-inlines-hidden" ]
}
}
if (current_cpu == "arm") {
cflags += [
"-march=armv7-a",
"-mfpu=neon",
"-mthumb",
]
} else if (current_cpu == "loongson3a") {
asmflags += [ "-march=loongson3a" ]
cflags += [
"-march=loongson3a",
# Causes an internal compiler error.
"-DSKCMS_PORTABLE",
]
} else if (current_cpu == "mips64el") {
asmflags += [ "-march=mips64" ]
cflags += [ "-march=mips64" ]
} else if (current_cpu == "x86" && !is_win) {
asmflags += [ "-m32" ]
cflags += [
"-m32",
"-msse2",
"-mfpmath=sse",
]
ldflags += [ "-m32" ]
}
if (malloc != "" && !is_win) {
cflags += [
"-fno-builtin-malloc",
"-fno-builtin-calloc",
"-fno-builtin-realloc",
"-fno-builtin-free",
]
libs += [ malloc ]
}
if (is_android) {
cflags += [ "--sysroot=$ndk/sysroot" ]
cflags_cc += [ "-isystem$ndk/sources/cxx-stl/llvm-libc++/include" ]
ldflags += [ "-static-libstdc++" ]
}
if (is_ios) {
_target = target_cpu
if (target_cpu == "arm") {
_target = "armv7"
} else if (target_cpu == "x86") {
_target = "i386"
} else if (target_cpu == "x64") {
_target = "x86_64"
}
asmflags += [
"-isysroot",
ios_sysroot,
"-arch",
_target,
]
cflags += [
"-isysroot",
ios_sysroot,
"-arch",
_target,
]
cflags_cc += [ "-stdlib=libc++" ]
ldflags += [
"-isysroot",
ios_sysroot,
"-arch",
_target,
"-stdlib=libc++",
]
libs += [ "objc" ]
}
if (is_linux) {
libs += [ "pthread" ]
if (is_debug && sanitize == "") {
defines += [ "_GLIBCXX_DEBUG" ]
}
}
if (is_mac) {
# Disable linker warnings. They're usually just annoyances like,
# ld: warning: text-based stub file
# /System/Library/Frameworks/foo.framework/foo.tbd and library file
# /System/Library/Frameworks/foo.framework/foo are out of sync.
# Falling back to library file for linking.
ldflags += [ "-Wl,-w" ]
}
if (sanitize != "" && sanitize != "MSVC") {
# You can either pass the sanitizers directly, e.g. "address,undefined",
# or pass one of the couple common aliases used by the bots.
sanitizers = sanitize
if (sanitize == "ASAN" || sanitize == "UBSAN") {
# ASAN implicitly runs all UBSAN checks also.
sanitizers = "undefined"
if (sanitize == "ASAN") {
sanitizers += ",address"
}
if (is_android) {
# TODO(mtklein): work out UBSAN link errors
sanitizers = "address"
}
} else if (sanitize == "TSAN") {
sanitizers = "thread"
} else if (sanitize == "MSAN") {
sanitizers = "memory"
}
_blacklist = rebase_path("../tools/xsan.blacklist")
cflags += [
"-fsanitize=$sanitizers",
"-fno-sanitize-recover=$sanitizers",
"-fsanitize-blacklist=$_blacklist",
]
ldflags += [ "-fsanitize=$sanitizers" ]
if (is_win) {
cflags += [ "/FI$_blacklist" ]
} else {
cflags += [
"-include$_blacklist",
"-fno-omit-frame-pointer",
]
}
if (is_linux) {
cflags_cc += [ "-stdlib=libc++" ]
ldflags += [ "-stdlib=libc++" ]
}
if (sanitizers == "memory") {
cflags += [ "-fsanitize-memory-track-origins" ]
}
}
}
config("no_exceptions") {
# Exceptions are disabled by default on Windows. (Use /EHsc to enable them.)
if (!is_win) {
cflags_cc = [ "-fno-exceptions" ]
}
}
config("warnings") {
cflags = []
cflags_cc = []
cflags_objc = []
cflags_objcc = []
if (is_win) {
cflags += [
"/W3", # Turn on lots of warnings.
# Disable a bunch of warnings:
"/wd4244", # conversion from 'float' to 'int', possible loss of data
"/wd4267", # conversion from 'size_t' to 'int', possible loss of data
"/wd4800", # forcing value to bool 'true' or 'false' (performance warning)
# Probably only triggers when /EHsc is enabled.
"/wd4291", # no matching operator delete found;
# memory will not be freed if initialization throws an exception
# These only show up in shared builds:
"/wd4251", # class 'type' needs to have dll-interface to be used by clients of class 'type2'
"/wd4275", # non dll-interface class 'base' used as base for dll-interface class 'derived'
]
} else {
cflags += [
"-Wall",
"-Wextra",
"-Winit-self",
"-Wpointer-arith",
"-Wsign-compare",
"-Wvla",
"-Wno-deprecated-declarations",
"-Wno-maybe-uninitialized",
]
cflags_cc += [
"-Wnon-virtual-dtor",
"-Wno-noexcept-type",
]
}
if (is_clang) {
cflags += [
"-fcolor-diagnostics",
"-Weverything",
"-Wno-unknown-warning-option", # Let older Clangs ignore newer Clangs' warnings.
]
if (target_cpu == "arm" && is_ios) {
# Clang seems to think new/malloc will only be 4-byte aligned on 32-bit iOS.
# We're pretty sure it's actually 8-byte alignment.
cflags += [ "-Wno-over-aligned" ]
}
if (target_cpu == "x86" && is_android) {
# Clang seems to think new/malloc will only be 4-byte aligned on 32-bit x86 Android builds.
# We're pretty sure it's actually 8-byte alignment. See OverAlignedTest.cpp for more info.
cflags += [ "-Wno-over-aligned" ]
}
# Shouldn't be necessary for local builds. With distributed Windows builds, files may lose
# their case during copy, causing case-sensitivity mismatch on remote machines.
cflags += [
"-Wno-nonportable-include-path",
"-Wno-nonportable-system-include-path",
]
# TODO: These would all be really great warnings to turn on.
cflags += [
"-Wno-cast-align",
"-Wno-cast-qual",
"-Wno-conversion",
"-Wno-disabled-macro-expansion",
"-Wno-documentation",
"-Wno-documentation-unknown-command",
"-Wno-double-promotion",
"-Wno-exit-time-destructors", # TODO: OK outside libskia
"-Wno-float-equal",
"-Wno-format-nonliteral",
"-Wno-global-constructors", # TODO: OK outside libskia
"-Wno-missing-prototypes",
"-Wno-missing-variable-declarations",
"-Wno-pedantic",
"-Wno-reserved-id-macro",
"-Wno-shadow",
"-Wno-shift-sign-overflow",
"-Wno-signed-enum-bitfield",
"-Wno-switch-enum",
"-Wno-undef",
"-Wno-unreachable-code",
"-Wno-unreachable-code-break",
"-Wno-unreachable-code-return",
"-Wno-unused-macros",
"-Wno-unused-member-function",
"-Wno-unused-template",
"-Wno-zero-as-null-pointer-constant",
"-Wno-thread-safety-negative",
]
cflags_cc += [
"-Wno-abstract-vbase-init",
"-Wno-weak-vtables",
]
# We are unlikely to want to fix these.
cflags += [
"-Wno-bad-function-cast",
"-Wno-covered-switch-default",
"-Wno-deprecated",
"-Wno-missing-noreturn",
"-Wno-old-style-cast",
"-Wno-padded",
"-Wno-newline-eof",
]
cflags_cc += [
"-Wno-c++98-compat",
"-Wno-c++98-compat-pedantic",
"-Wno-undefined-func-template",
"-Wno-return-std-move-in-c++11",
]
cflags_objc += [
"-Wno-direct-ivar-access",
"-Wno-objc-interface-ivars",
]
cflags_objcc += [
"-Wno-direct-ivar-access",
"-Wno-objcc-interface-ivars",
]
}
if (!is_win || is_clang) {
cflags += [ "-Wno-implicit-fallthrough" ]
}
}
config("warnings_except_public_headers") {
if (!is_win || is_clang) {
cflags = [ "-Wno-unused-parameter" ]
}
}
config("extra_flags") {
asmflags = extra_asmflags
cflags = extra_cflags
cflags_c = extra_cflags_c
cflags_cc = extra_cflags_cc
ldflags = extra_ldflags
}
config("debug_symbols") {
# It's annoying to wait for full debug symbols to push over
# to Android devices. -gline-tables-only is a lot slimmer.
if (is_android) {
cflags = [
"-gline-tables-only",
"-funwind-tables", # Helps make in-process backtraces fuller.
]
} else if (is_win) {
cflags = [ "/Z7" ]
if (is_clang) {
cflags += [ "-gcodeview-ghash" ]
ldflags = [ "/DEBUG:GHASH" ]
} else {
ldflags = [ "/DEBUG:FASTLINK" ]
}
} else {
cflags = [ "-g" ]
}
}
config("no_rtti") {
if (sanitize != "ASAN") { # -fsanitize=vptr requires RTTI
if (is_win) {
cflags_cc = [ "/GR-" ]
} else {
cflags_cc = [ "-fno-rtti" ]
}
}
}
config("optimize") {
if (is_win) {
cflags = [
"/O2",
"/Zc:inline",
]
ldflags = [
"/OPT:ICF",
"/OPT:REF",
]
} else {
cflags = [ "-O3" ]
if (is_mac || is_ios) {
ldflags = [ "-dead_strip" ]
} else {
cflags += [
"-fdata-sections",
"-ffunction-sections",
]
ldflags = [ "-Wl,--gc-sections" ]
}
if (target_cpu == "wasm") {
# The compiler asks us to add an optimization flag to both cflags
# and ldflags to cut down on the local variables,
# for performance reasons.
# The "linking" step is the conversion to javascript.
ldflags += [ "-O3" ]
}
}
}
config("NDEBUG") {
defines = [ "NDEBUG" ]
}
config("executable") {
if (is_android) {
ldflags = [
"-pie",
"-rdynamic",
]
} else if (is_mac) {
ldflags = [ "-Wl,-rpath,@loader_path/." ]
} else if (is_linux) {
ldflags = [
"-rdynamic",
"-Wl,-rpath,\$ORIGIN",
]
} else if (is_win) {
ldflags = [
"/SUBSYSTEM:CONSOLE", # Quiet "no subsystem specified; CONSOLE assumed".
"/INCREMENTAL:NO", # Quiet warnings about failing to incrementally link by never trying to.
]
}
}