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| import("//llvm/utils/gn/build/buildflags.gni")
import("//llvm/utils/gn/build/mac_sdk.gni")
import("//llvm/utils/gn/build/toolchain/compiler.gni")
import("//llvm/utils/gn/build/toolchain/target_flags.gni")
declare_args() {
# Whether to build everything with coverage information.
# After building with this, run tests and then run
# llvm/utils/prepare-code-coverage-artifact.py \
# .../llvm-profdata .../llvm-cov out/gn/profiles/ report/ \
# out/gn/bin/llvm-undname ...`
# to generate a HTML report for the binaries passed in the last line.
llvm_build_instrumented_coverage = false
}
assert(!llvm_build_instrumented_coverage || is_clang,
"llvm_build_instrumented_coverage requires clang as host compiler")
config("compiler_defaults") {
defines = []
if (!llvm_enable_assertions) {
defines += [ "NDEBUG" ]
}
asmflags = target_flags
cflags = target_flags
ldflags = target_flags + target_ldflags
if (host_os == "mac" && clang_base_path != "") {
cflags += [
"-isysroot",
mac_sdk_path,
]
}
if (host_os != "win") {
if (is_debug) {
cflags += [ "-g" ]
}
if (is_optimized) {
cflags += [ "-O3" ]
}
cflags += [ "-fdiagnostics-color" ]
if (use_lld) {
ldflags += [ "-Wl,--color-diagnostics" ]
}
cflags_cc = [
"-std=c++14",
"-fvisibility-inlines-hidden",
]
} else {
if (is_debug) {
cflags += [
"/Zi",
"/FS",
]
ldflags += [ "/DEBUG" ]
}
if (is_optimized) {
cflags += [
"/O2",
"/Zc:inline",
]
ldflags += [
"/OPT:REF",
"/OPT:ICF",
]
}
defines += [
"_CRT_SECURE_NO_DEPRECATE",
"_CRT_SECURE_NO_WARNINGS",
"_CRT_NONSTDC_NO_DEPRECATE",
"_CRT_NONSTDC_NO_WARNINGS",
"_SCL_SECURE_NO_DEPRECATE",
"_SCL_SECURE_NO_WARNINGS",
"_HAS_EXCEPTIONS=0",
"_UNICODE",
"UNICODE",
]
cflags += [ "/EHs-c-" ]
# The MSVC default value (1 MB) is not enough for parsing recursive C++
# templates in Clang.
ldflags += [ "/STACK:10000000" ]
}
# Warning setup.
if (host_os == "win" && !is_clang) {
cflags += [
# Suppress ''modifier' : used more than once' (__forceinline and inline).
"-wd4141",
# Suppress 'conversion from 'type1' to 'type2', possible loss of data'.
"-wd4244",
# Suppress 'conversion from 'size_t' to 'type', possible loss of data'.
"-wd4267",
# Suppress 'no matching operator delete found'.
"-wd4291",
# Suppress 'noexcept used with no exception handling mode specified'.
"-wd4577",
# Suppress 'destructor was implicitly defined as deleted'.
"-wd4624",
# Suppress 'unsafe mix of type <type> and type <type> in operation'.
"-wd4805",
]
} else {
if (host_os == "win") {
cflags += [ "/W4" ]
} else {
cflags += [
"-Wall",
"-Wextra",
]
}
cflags += [ "-Wno-unused-parameter" ]
if (is_clang) {
cflags += [
"-Wdelete-non-virtual-dtor",
"-Wstring-conversion",
]
} else {
cflags += [
# GCC's -Wcomment complains about // comments ending with '\' if the
# next line is also a // comment.
"-Wno-comment",
# Disable gcc's potentially uninitialized use analysis as it presents
# lots of false positives.
"-Wno-maybe-uninitialized",
]
cflags_cc += [
# The LLVM libraries have no stable C++ API, so -Wnoexcept-type is not
# useful.
"-Wno-noexcept-type",
]
}
if (is_clang && use_goma) {
# goma converts all paths to lowercase on the server, breaking this
# warning.
cflags += [ "-Wno-nonportable-include-path" ]
}
}
# On Windows, the linker is not invoked through the compiler driver.
if (use_lld && host_os != "win") {
ldflags += [ "-fuse-ld=lld" ]
}
if (llvm_build_instrumented_coverage) {
cflags += [
"-fcoverage-mapping",
# Using an absolute path here is lame, but it's used at test execution
# time to generate the profiles, and lit doesn't specify a fixed folder
# for test execution -- so this is the only way to get all profiles into
# a single folder like llvm/utils/prepare-code-coverage-artifact.py
# expects.
"-fprofile-instr-generate=" +
rebase_path("$root_build_dir/profiles/%4m.profraw"),
]
ldflags += [ "-fprofile-instr-generate" ]
}
}
config("no_exceptions") {
if (host_os != "win") {
cflags_cc = [ "-fno-exceptions" ]
}
}
config("no_rtti") {
if (current_os == "win") {
cflags_cc = [ "/GR-" ]
} else {
cflags_cc = [ "-fno-rtti" ]
}
}
# To make an archive that can be distributed, you need to remove this config and
# set complete_static_lib.
config("thin_archive") {
if (current_os != "win" && current_os != "mac") {
arflags = [ "-T" ]
}
}
config("llvm_code") {
include_dirs = [
"//llvm/include",
"$root_gen_dir/llvm/include",
]
}
config("lld_code") {
include_dirs = [
"//lld/include",
"$root_gen_dir/lld/include",
]
}
config("clang_code") {
if (host_os != "win") {
cflags = [ "-fno-strict-aliasing" ]
}
include_dirs = [
"//clang/include",
"$root_gen_dir/clang/include",
]
}
config("crt_code") {
include_dirs = [ "//compiler-rt/lib" ]
cflags = [
"-fPIC",
"-funwind-tables",
"-gline-tables-only",
"-fvisibility=hidden",
]
}
config("warn_covered_switch_default") {
if (is_clang) {
cflags = [ "-Wcovered-switch-default" ]
}
}
|