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// Copyright 2016 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package config
import (
"runtime"
"strings"
"android/soong/android"
"android/soong/remoteexec"
)
var (
pctx = android.NewPackageContext("android/soong/cc/config")
exportedVars = android.NewExportedVariables(pctx)
// Flags used by lots of devices. Putting them in package static variables
// will save bytes in build.ninja so they aren't repeated for every file
commonGlobalCflags = []string{
"-DANDROID",
"-fmessage-length=0",
"-W",
"-Wall",
"-Wno-unused",
"-Winit-self",
"-Wpointer-arith",
"-Wunreachable-code-loop-increment",
// Make paths in deps files relative
"-no-canonical-prefixes",
"-DNDEBUG",
"-UDEBUG",
"-fno-exceptions",
"-Wno-multichar",
"-O2",
"-g",
"-fdebug-default-version=5",
"-fno-strict-aliasing",
"-Werror=date-time",
"-Werror=pragma-pack",
"-Werror=pragma-pack-suspicious-include",
"-Werror=string-plus-int",
"-Werror=unreachable-code-loop-increment",
"-D__compiler_offsetof=__builtin_offsetof",
// Emit address-significance table which allows linker to perform safe ICF. Clang does
// not emit the table by default on Android since NDK still uses GNU binutils.
"-faddrsig",
// Turn on -fcommon explicitly, since Clang now defaults to -fno-common. The cleanup bug
// tracking this is http://b/151457797.
"-fcommon",
// Help catch common 32/64-bit errors.
"-Werror=int-conversion",
// Enable the new pass manager.
"-fexperimental-new-pass-manager",
// Disable overly aggressive warning for macros defined with a leading underscore
// This happens in AndroidConfig.h, which is included nearly everywhere.
// TODO: can we remove this now?
"-Wno-reserved-id-macro",
// Force clang to always output color diagnostics. Ninja will strip the ANSI
// color codes if it is not running in a terminal.
"-fcolor-diagnostics",
// Warnings from clang-7.0
"-Wno-sign-compare",
// Warnings from clang-8.0
"-Wno-defaulted-function-deleted",
// Disable -Winconsistent-missing-override until we can clean up the existing
// codebase for it.
"-Wno-inconsistent-missing-override",
// Warnings from clang-10
// Nested and array designated initialization is nice to have.
"-Wno-c99-designator",
// Many old files still have GNU designator syntax.
"-Wno-gnu-designator",
// Warnings from clang-12
"-Wno-gnu-folding-constant",
// Calls to the APIs that are newer than the min sdk version of the caller should be
// guarded with __builtin_available.
"-Wunguarded-availability",
// This macro allows the bionic versioning.h to indirectly determine whether the
// option -Wunguarded-availability is on or not.
"-D__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__",
// Turn off FMA which got enabled by default in clang-r445002 (http://b/218805949)
"-ffp-contract=off",
}
commonGlobalConlyflags = []string{}
deviceGlobalCflags = []string{
"-ffunction-sections",
"-fdata-sections",
"-fno-short-enums",
"-funwind-tables",
"-fstack-protector-strong",
"-Wa,--noexecstack",
"-D_FORTIFY_SOURCE=2",
"-Wstrict-aliasing=2",
"-Werror=return-type",
"-Werror=non-virtual-dtor",
"-Werror=address",
"-Werror=sequence-point",
"-Werror=format-security",
"-nostdlibinc",
// Emit additional debug info for AutoFDO
"-fdebug-info-for-profiling",
}
deviceGlobalCppflags = []string{
"-fvisibility-inlines-hidden",
}
deviceGlobalLdflags = []string{
"-Wl,-z,noexecstack",
"-Wl,-z,relro",
"-Wl,-z,now",
"-Wl,--build-id=md5",
"-Wl,--fatal-warnings",
"-Wl,--no-undefined-version",
// TODO: Eventually we should link against a libunwind.a with hidden symbols, and then these
// --exclude-libs arguments can be removed.
"-Wl,--exclude-libs,libgcc.a",
"-Wl,--exclude-libs,libgcc_stripped.a",
"-Wl,--exclude-libs,libunwind_llvm.a",
"-Wl,--exclude-libs,libunwind.a",
"-Wl,--icf=safe",
}
deviceGlobalLldflags = append(deviceGlobalLdflags,
[]string{
"-fuse-ld=lld",
}...)
hostGlobalCflags = []string{}
hostGlobalCppflags = []string{}
hostGlobalLdflags = []string{}
hostGlobalLldflags = []string{"-fuse-ld=lld"}
commonGlobalCppflags = []string{
"-Wsign-promo",
// -Wimplicit-fallthrough is not enabled by -Wall.
"-Wimplicit-fallthrough",
// Enable clang's thread-safety annotations in libcxx.
"-D_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS",
// libc++'s math.h has an #include_next outside of system_headers.
"-Wno-gnu-include-next",
}
noOverrideGlobalCflags = []string{
"-Werror=bool-operation",
"-Werror=implicit-int-float-conversion",
"-Werror=int-in-bool-context",
"-Werror=int-to-pointer-cast",
"-Werror=pointer-to-int-cast",
"-Werror=string-compare",
"-Werror=xor-used-as-pow",
// http://b/161386391 for -Wno-void-pointer-to-enum-cast
"-Wno-void-pointer-to-enum-cast",
// http://b/161386391 for -Wno-void-pointer-to-int-cast
"-Wno-void-pointer-to-int-cast",
// http://b/161386391 for -Wno-pointer-to-int-cast
"-Wno-pointer-to-int-cast",
"-Werror=fortify-source",
"-Werror=address-of-temporary",
// Bug: http://b/29823425 Disable -Wnull-dereference until the
// new cases detected by this warning in Clang r271374 are
// fixed.
//"-Werror=null-dereference",
"-Werror=return-type",
// http://b/72331526 Disable -Wtautological-* until the instances detected by these
// new warnings are fixed.
"-Wno-tautological-constant-compare",
"-Wno-tautological-type-limit-compare",
// http://b/145210666
"-Wno-reorder-init-list",
// http://b/145211066
"-Wno-implicit-int-float-conversion",
// New warnings to be fixed after clang-r377782.
"-Wno-sizeof-array-div", // http://b/148815709
"-Wno-tautological-overlap-compare", // http://b/148815696
// New warnings to be fixed after clang-r383902.
"-Wno-deprecated-copy", // http://b/153746672
"-Wno-range-loop-construct", // http://b/153747076
"-Wno-misleading-indentation", // http://b/153746954
"-Wno-zero-as-null-pointer-constant", // http://b/68236239
"-Wno-deprecated-anon-enum-enum-conversion", // http://b/153746485
"-Wno-deprecated-enum-enum-conversion", // http://b/153746563
"-Wno-string-compare", // http://b/153764102
"-Wno-enum-enum-conversion", // http://b/154138986
"-Wno-enum-float-conversion", // http://b/154255917
"-Wno-pessimizing-move", // http://b/154270751
// New warnings to be fixed after clang-r399163
"-Wno-non-c-typedef-for-linkage", // http://b/161304145
// New warnings to be fixed after clang-r428724
"-Wno-align-mismatch", // http://b/193679946
// New warnings to be fixed after clang-r433403
"-Wno-error=unused-but-set-variable", // http://b/197240255
"-Wno-error=unused-but-set-parameter", // http://b/197240255
}
noOverrideExternalGlobalCflags = []string{
// http://b/197240255
"-Wno-unused-but-set-variable",
"-Wno-unused-but-set-parameter",
// http://b/215753485
"-Wno-bitwise-instead-of-logical",
}
// Extra cflags for external third-party projects to disable warnings that
// are infeasible to fix in all the external projects and their upstream repos.
extraExternalCflags = []string{
"-Wno-enum-compare",
"-Wno-enum-compare-switch",
// http://b/72331524 Allow null pointer arithmetic until the instances detected by
// this new warning are fixed.
"-Wno-null-pointer-arithmetic",
// Bug: http://b/29823425 Disable -Wnull-dereference until the
// new instances detected by this warning are fixed.
"-Wno-null-dereference",
// http://b/145211477
"-Wno-pointer-compare",
// http://b/145211022
"-Wno-xor-used-as-pow",
// http://b/145211022
"-Wno-final-dtor-non-final-class",
// http://b/165945989
"-Wno-psabi",
// http://b/199369603
"-Wno-null-pointer-subtraction",
// http://b/175068488
"-Wno-string-concatenation",
}
IllegalFlags = []string{
"-w",
}
CStdVersion = "gnu99"
CppStdVersion = "gnu++17"
ExperimentalCStdVersion = "gnu11"
ExperimentalCppStdVersion = "gnu++2a"
// prebuilts/clang default settings.
ClangDefaultBase = "prebuilts/clang/host"
ClangDefaultVersion = "clang-r450784b"
ClangDefaultShortVersion = "14.0.4"
// Directories with warnings from Android.bp files.
WarningAllowedProjects = []string{
"device/",
"vendor/",
}
// Directories with warnings from Android.mk files.
WarningAllowedOldProjects = []string{}
)
// BazelCcToolchainVars generates bzl file content containing variables for
// Bazel's cc_toolchain configuration.
func BazelCcToolchainVars(config android.Config) string {
return android.BazelToolchainVars(config, exportedVars)
}
func ExportStringList(name string, value []string) {
exportedVars.ExportStringList(name, value)
}
func init() {
if runtime.GOOS == "linux" {
commonGlobalCflags = append(commonGlobalCflags, "-fdebug-prefix-map=/proc/self/cwd=")
}
exportedVars.ExportStringListStaticVariable("CommonGlobalConlyflags", commonGlobalConlyflags)
exportedVars.ExportStringListStaticVariable("DeviceGlobalCppflags", deviceGlobalCppflags)
exportedVars.ExportStringListStaticVariable("DeviceGlobalLdflags", deviceGlobalLdflags)
exportedVars.ExportStringListStaticVariable("DeviceGlobalLldflags", deviceGlobalLldflags)
exportedVars.ExportStringListStaticVariable("HostGlobalCppflags", hostGlobalCppflags)
exportedVars.ExportStringListStaticVariable("HostGlobalLdflags", hostGlobalLdflags)
exportedVars.ExportStringListStaticVariable("HostGlobalLldflags", hostGlobalLldflags)
// Export the static default CommonGlobalCflags to Bazel.
// TODO(187086342): handle cflags that are set in VariableFuncs.
bazelCommonGlobalCflags := append(
commonGlobalCflags,
[]string{
// Default to zero initialization.
"-ftrivial-auto-var-init=zero",
"-enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang",
}...)
exportedVars.ExportStringList("CommonGlobalCflags", bazelCommonGlobalCflags)
pctx.VariableFunc("CommonGlobalCflags", func(ctx android.PackageVarContext) string {
flags := commonGlobalCflags
// http://b/131390872
// Automatically initialize any uninitialized stack variables.
// Prefer zero-init if multiple options are set.
if ctx.Config().IsEnvTrue("AUTO_ZERO_INITIALIZE") {
flags = append(flags, "-ftrivial-auto-var-init=zero -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang")
} else if ctx.Config().IsEnvTrue("AUTO_PATTERN_INITIALIZE") {
flags = append(flags, "-ftrivial-auto-var-init=pattern")
} else if ctx.Config().IsEnvTrue("AUTO_UNINITIALIZE") {
flags = append(flags, "-ftrivial-auto-var-init=uninitialized")
} else {
// Default to zero initialization.
flags = append(flags, "-ftrivial-auto-var-init=zero -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang")
}
// Workaround for ccache with clang.
// See http://petereisentraut.blogspot.com/2011/05/ccache-and-clang.html.
if ctx.Config().IsEnvTrue("USE_CCACHE") {
flags = append(flags, "-Wno-unused-command-line-argument")
}
return strings.Join(flags, " ")
})
// Export the static default DeviceGlobalCflags to Bazel.
// TODO(187086342): handle cflags that are set in VariableFuncs.
exportedVars.ExportStringList("DeviceGlobalCflags", deviceGlobalCflags)
pctx.VariableFunc("DeviceGlobalCflags", func(ctx android.PackageVarContext) string {
return strings.Join(deviceGlobalCflags, " ")
})
exportedVars.ExportStringListStaticVariable("HostGlobalCflags", hostGlobalCflags)
exportedVars.ExportStringListStaticVariable("NoOverrideGlobalCflags", noOverrideGlobalCflags)
exportedVars.ExportStringListStaticVariable("NoOverrideExternalGlobalCflags", noOverrideExternalGlobalCflags)
exportedVars.ExportStringListStaticVariable("CommonGlobalCppflags", commonGlobalCppflags)
exportedVars.ExportStringListStaticVariable("ExternalCflags", extraExternalCflags)
// Everything in these lists is a crime against abstraction and dependency tracking.
// Do not add anything to this list.
commonGlobalIncludes := []string{
"system/core/include",
"system/logging/liblog/include",
"system/media/audio/include",
"hardware/libhardware/include",
"hardware/libhardware_legacy/include",
"hardware/ril/include",
"frameworks/native/include",
"frameworks/native/opengl/include",
"frameworks/av/include",
}
exportedVars.ExportStringList("CommonGlobalIncludes", commonGlobalIncludes)
pctx.PrefixedExistentPathsForSourcesVariable("CommonGlobalIncludes", "-I", commonGlobalIncludes)
exportedVars.ExportStringStaticVariable("CLANG_DEFAULT_VERSION", ClangDefaultVersion)
exportedVars.ExportStringStaticVariable("CLANG_DEFAULT_SHORT_VERSION", ClangDefaultShortVersion)
pctx.StaticVariableWithEnvOverride("ClangBase", "LLVM_PREBUILTS_BASE", ClangDefaultBase)
pctx.StaticVariableWithEnvOverride("ClangVersion", "LLVM_PREBUILTS_VERSION", ClangDefaultVersion)
pctx.StaticVariable("ClangPath", "${ClangBase}/${HostPrebuiltTag}/${ClangVersion}")
pctx.StaticVariable("ClangBin", "${ClangPath}/bin")
pctx.StaticVariableWithEnvOverride("ClangShortVersion", "LLVM_RELEASE_VERSION", ClangDefaultShortVersion)
pctx.StaticVariable("ClangAsanLibDir", "${ClangBase}/linux-x86/${ClangVersion}/lib64/clang/${ClangShortVersion}/lib/linux")
// These are tied to the version of LLVM directly in external/llvm, so they might trail the host prebuilts
// being used for the rest of the build process.
pctx.SourcePathVariable("RSClangBase", "prebuilts/clang/host")
pctx.SourcePathVariable("RSClangVersion", "clang-3289846")
pctx.SourcePathVariable("RSReleaseVersion", "3.8")
pctx.StaticVariable("RSLLVMPrebuiltsPath", "${RSClangBase}/${HostPrebuiltTag}/${RSClangVersion}/bin")
pctx.StaticVariable("RSIncludePath", "${RSLLVMPrebuiltsPath}/../lib64/clang/${RSReleaseVersion}/include")
pctx.PrefixedExistentPathsForSourcesVariable("RsGlobalIncludes", "-I",
[]string{
"external/clang/lib/Headers",
"frameworks/rs/script_api/include",
})
pctx.VariableFunc("CcWrapper", func(ctx android.PackageVarContext) string {
if override := ctx.Config().Getenv("CC_WRAPPER"); override != "" {
return override + " "
}
return ""
})
pctx.StaticVariableWithEnvOverride("RECXXPool", "RBE_CXX_POOL", remoteexec.DefaultPool)
pctx.StaticVariableWithEnvOverride("RECXXLinksPool", "RBE_CXX_LINKS_POOL", remoteexec.DefaultPool)
pctx.StaticVariableWithEnvOverride("REClangTidyPool", "RBE_CLANG_TIDY_POOL", remoteexec.DefaultPool)
pctx.StaticVariableWithEnvOverride("RECXXLinksExecStrategy", "RBE_CXX_LINKS_EXEC_STRATEGY", remoteexec.LocalExecStrategy)
pctx.StaticVariableWithEnvOverride("REClangTidyExecStrategy", "RBE_CLANG_TIDY_EXEC_STRATEGY", remoteexec.LocalExecStrategy)
pctx.StaticVariableWithEnvOverride("REAbiDumperExecStrategy", "RBE_ABI_DUMPER_EXEC_STRATEGY", remoteexec.LocalExecStrategy)
pctx.StaticVariableWithEnvOverride("REAbiLinkerExecStrategy", "RBE_ABI_LINKER_EXEC_STRATEGY", remoteexec.LocalExecStrategy)
}
var HostPrebuiltTag = exportedVars.ExportVariableConfigMethod("HostPrebuiltTag", android.Config.PrebuiltOS)
func ClangPath(ctx android.PathContext, file string) android.SourcePath {
type clangToolKey string
key := android.NewCustomOnceKey(clangToolKey(file))
return ctx.Config().OnceSourcePath(key, func() android.SourcePath {
return clangPath(ctx).Join(ctx, file)
})
}
var clangPathKey = android.NewOnceKey("clangPath")
func clangPath(ctx android.PathContext) android.SourcePath {
return ctx.Config().OnceSourcePath(clangPathKey, func() android.SourcePath {
clangBase := ClangDefaultBase
if override := ctx.Config().Getenv("LLVM_PREBUILTS_BASE"); override != "" {
clangBase = override
}
clangVersion := ClangDefaultVersion
if override := ctx.Config().Getenv("LLVM_PREBUILTS_VERSION"); override != "" {
clangVersion = override
}
return android.PathForSource(ctx, clangBase, ctx.Config().PrebuiltOS(), clangVersion)
})
}