blob: 2ba4b45a9fda9bcb7a94663275328021638a874c [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.
if (is_fuchsia) {
import("//build/fuchsia/sdk.gni")
}
declare_args() {
extra_asmflags = []
extra_cflags = []
extra_cflags_c = []
extra_cflags_cc = []
extra_ldflags = []
malloc = ""
werror = false
xcode_sysroot = ""
}
if (is_ios && xcode_sysroot == "") {
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"
}
}
xcode_sysroot = exec_script("find_xcode_sysroot.py", [ sdk ], "trim string")
}
# If building for mac on a mac then lookup all the system includes so that goma and the clang
# shipped with chrome can find them. When the gn_to_bp.py tool is run, then the host_os != mac.
# In this case leave the xcode_sysroot empty, and the cc/c++ that come with XCode will be able to
# find needed include paths.
if (is_mac && host_os == "mac" && xcode_sysroot == "") {
xcode_sysroot =
exec_script("find_xcode_sysroot.py", [ "macosx" ], "trim string")
}
config("default") {
asmflags = []
cflags = []
cflags_c = []
cflags_cc = []
defines = []
ldflags = []
libs = []
if (werror) {
if (is_win) {
cflags += [ "/WX" ]
} else {
cflags += [ "-Werror" ]
}
}
# Disable warnings about unknown attributes.
# (These unknown attribute warnings are on by default, so we don't make
# disabling them part of :warnings, as some targets remove :warnings.)
if (is_win && !is_clang) {
cflags += [ "/wd5030" ]
} else {
cflags += [ "-Wno-attributes" ]
}
if (is_fuchsia && using_fuchsia_sdk) {
ldflags += [
"-v",
"--sysroot=" + rebase_path("$fuchsia_sdk_path/arch/$target_cpu/sysroot"),
]
cflags += [ "--sysroot=" +
rebase_path("$fuchsia_sdk_path/arch/$target_cpu/sysroot") ]
if (target_cpu == "x64") {
target_triple = "--target=x86_64-${target_os}"
} else if (target_cpu == "arm64") {
target_triple = "--target=aarch64-unknown-${target_os}"
} else {
print("Unknown target CPU for Fuchsia target build.")
assert(false)
}
ldflags += [ target_triple ]
cflags += [ target_triple ]
asmflags += [ target_triple ]
}
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.
]
cflags_cc += [ "/std:c++17" ]
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/$target_cpu",
]
} else {
cflags += [
"-fstrict-aliasing",
"-fPIC",
"-fvisibility=hidden",
]
cflags_cc += [
"-std=c++17",
"-fvisibility-inlines-hidden",
]
}
if (current_cpu == "arm") {
cflags += [
"-march=armv7-a",
"-mfpu=neon",
"-mthumb",
]
} else if (current_cpu == "x86" && !is_win) {
asmflags += [ "-m32" ]
cflags += [
"-m32",
"-msse2",
"-mfpmath=sse",
]
ldflags += [ "-m32" ]
}
if (malloc != "" && !is_win) {
cflags += [
"-fno-builtin-malloc",
"-fno-builtin-calloc",
"-fno-builtin-realloc",
"-fno-builtin-free",
]
libs += [ malloc ]
}
if (is_android) {
cflags += [ "--sysroot=$ndk/toolchains/llvm/prebuilt/$ndk_host/sysroot" ]
ldflags += [ "-static-libstdc++" ]
}
if (is_ios) {
if (target_cpu == "arm") {
_arch_flags = [
"-arch",
"armv7",
]
} else if (target_cpu == "arm64") {
_arch_flags = [
"-arch",
"arm64",
"-arch",
"arm64e",
]
} else if (target_cpu == "x86") {
_arch_flags = [
"-arch",
"i386",
]
} else if (target_cpu == "x64") {
_arch_flags = [
"-arch",
"x86_64",
]
} else {
_arch_flags = [
"-arch",
target_cpu,
]
}
asmflags += [
"-isysroot",
xcode_sysroot,
] + _arch_flags
cflags += [
"-isysroot",
xcode_sysroot,
] + _arch_flags
cflags_cc += [
"-stdlib=libc++",
"-fno-aligned-allocation",
]
ldflags += [
"-isysroot",
xcode_sysroot,
"-stdlib=libc++",
] + _arch_flags
libs += [ "objc" ]
if (ios_min_target != "") {
cflags += [ "-miphoneos-version-min=$ios_min_target" ]
asmflags += [ "-miphoneos-version-min=$ios_min_target" ]
ldflags += [ "-miphoneos-version-min=$ios_min_target" ]
}
}
if (is_linux) {
libs += [ "pthread" ]
}
if (is_mac) {
# If there was a xcode_sysroot set in args or calculated then use it, else don't set anything
# because the XCode cc/c++ already know all this stuff.
if (xcode_sysroot != "") {
asmflags += [
"-isysroot",
xcode_sysroot,
]
cflags += [
"-isysroot",
xcode_sysroot,
]
ldflags += [
"-isysroot",
xcode_sysroot,
]
}
# 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" ]
# As of 11/2020, gn is an x86 binary and defaults the host_cpu to x86_64.
# This allows you to build arm64 mac binaries by setting target_cpu = "arm64"
if (current_cpu == "arm64") {
asmflags += [
"-target",
"arm64-apple-macos11",
]
cflags += [
"-target",
"arm64-apple-macos11",
]
ldflags += [
"-target",
"arm64-apple-macos11",
]
}
}
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") {
# ASAN implicitly runs all UBSAN checks also.
sanitizers = "undefined,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"
}
_suppressions = rebase_path("../tools/xsan.supp")
cflags += [
"-fsanitize=$sanitizers",
"-fno-sanitize-recover=$sanitizers",
"-fsanitize-blacklist=$_suppressions",
]
if (is_win) {
cflags += [
"/FI$_suppressions",
# On Release builds, we get strange warnings about string literals.
"/GF-",
]
assert(clang_win != "")
libs += [ "$clang_win/lib/clang/$clang_win_version/lib/windows/clang_rt.asan-x86_64.lib" ]
} else {
cflags += [
"-include$_suppressions",
"-fno-omit-frame-pointer",
]
ldflags += [ "-fsanitize=$sanitizers" ]
}
if (is_linux) {
cflags_cc += [ "-stdlib=libc++" ]
ldflags += [ "-stdlib=libc++" ]
}
if (sanitizers == "memory") {
cflags += [ "-fsanitize-memory-track-origins" ]
}
if (sanitizers == "safe-stack") {
cflags_cc += [ "-fno-aligned-allocation" ]
}
}
}
# See skia:9731.
config("recover_pointer_overflow") {
cflags = [ "-fsanitize-recover=pointer-overflow" ]
}
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'
# It'd be nice to fix these and turn this on:
"/wd5041", # out-of-line definition for constexpr static data member is
# not needed and is deprecated in C++17
# warning C4996: 'std::result_of_t': warning STL4014: std::result_of and std::result_of_t are
# deprecated in C++17. They are superseded by std::invoke_result and std::invoke_result_t.
"/wd4996",
]
} else {
cflags += [
"-Wall",
"-Wextra",
"-Winit-self",
"-Wpointer-arith",
"-Wsign-compare",
"-Wvla",
"-Wno-deprecated-declarations",
"-Wno-maybe-uninitialized",
"-Wno-psabi",
]
cflags_cc += [
"-Wnon-virtual-dtor",
"-Wno-noexcept-type",
"-Wno-redundant-move", #TODO: gcc conflict with return-std-move-in-c++11
]
}
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",
"-Wno-non-c-typedef-for-linkage", # Dawn, not Skia per se.
]
cflags_cc += [
"-Wno-abstract-vbase-init",
"-Wno-weak-vtables",
]
# Turn back on after -Wno-conversion.
# This only affects public headers... see :warnings_except_public_headers.
cflags += [ "-Wsign-conversion" ]
# We are unlikely to want to fix these.
cflags += [
"-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",
]
cflags_objc += [
"-Wno-direct-ivar-access",
"-Wno-objc-interface-ivars",
]
cflags_objcc += [
"-Wno-direct-ivar-access",
"-Wno-objcc-interface-ivars",
]
# Wno-deprecated turns off the whole group, but also has its own warnings like
# out-of-line definition of constexpr static data member is redundant in C++17 and is deprecated [-Werror,-Wdeprecated]
# but we would like others. Created from clang/include/clang/Basic/DiagnosticGroups.td
cflags += [
"-Wdeprecated-anon-enum-enum-conversion",
"-Wdeprecated-array-compare",
"-Wdeprecated-attributes",
"-Wdeprecated-comma-subscript",
"-Wdeprecated-copy",
#"-Wdeprecated-copy-dtor",
#"-Wdeprecated-declarations",
"-Wdeprecated-dynamic-exception-spec",
"-Wdeprecated-enum-compare",
"-Wdeprecated-enum-compare-conditional",
"-Wdeprecated-enum-enum-conversion",
"-Wdeprecated-enum-float-conversion",
"-Wdeprecated-increment-bool",
"-Wdeprecated-register",
"-Wdeprecated-this-capture",
"-Wdeprecated-volatile",
"-Wdeprecated-writable-str",
]
}
}
config("warnings_except_public_headers") {
if (!is_win || is_clang) {
cflags = [
"-Wno-sign-conversion",
"-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.
]
}
}