b3c2154f2a
Gold recognizes a different set of emulation strings to specify targets than the bfd linker accepts. Clang only passes bfd emulations to the linker, so we need to override these with the versions accepted by gold when using gold. Gold normally picks up the correct target from the first ELF input file if it cannot parse the emulation parameter. However when using LTO, all objects may be bitcode files, which causes gold to rely on the passed --oformat or -m parameter to determine the proper target. If gold cannot parse the emulation string passed by clang, it fails to link. Test: build LTO version of libc Change-Id: I38e78bb912fd3cc5fb7b4a762284f50ddd4f3998
440 lines
13 KiB
Go
440 lines
13 KiB
Go
// Copyright 2015 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package config
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import (
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"fmt"
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"strings"
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"android/soong/android"
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)
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var (
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armToolchainCflags = []string{
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"-mthumb-interwork",
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"-msoft-float",
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}
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armCflags = []string{
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"-fno-exceptions", // from build/core/combo/select.mk
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"-Wno-multichar", // from build/core/combo/select.mk
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"-ffunction-sections",
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"-fdata-sections",
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"-funwind-tables",
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"-fstack-protector-strong",
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"-Wa,--noexecstack",
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"-Werror=format-security",
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"-D_FORTIFY_SOURCE=2",
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"-fno-short-enums",
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"-no-canonical-prefixes",
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"-fno-canonical-system-headers",
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"-fno-builtin-sin",
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"-fno-strict-volatile-bitfields",
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// TARGET_RELEASE_CFLAGS
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"-DNDEBUG",
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"-g",
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"-Wstrict-aliasing=2",
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"-fgcse-after-reload",
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"-frerun-cse-after-loop",
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"-frename-registers",
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}
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armCppflags = []string{
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"-fvisibility-inlines-hidden",
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}
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armLdflags = []string{
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"-Wl,-z,noexecstack",
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"-Wl,-z,relro",
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"-Wl,-z,now",
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"-Wl,--build-id=md5",
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"-Wl,--warn-shared-textrel",
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"-Wl,--fatal-warnings",
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"-Wl,--icf=safe",
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"-Wl,--hash-style=gnu",
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"-Wl,--no-undefined-version",
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"-Wl,-m,armelf",
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}
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armArmCflags = []string{
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"-O2",
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"-fomit-frame-pointer",
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"-fstrict-aliasing",
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"-funswitch-loops",
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}
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armThumbCflags = []string{
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"-mthumb",
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"-Os",
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"-fomit-frame-pointer",
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"-fno-strict-aliasing",
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}
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armArchVariantCflags = map[string][]string{
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"armv5te": []string{
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"-march=armv5te",
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"-mtune=xscale",
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"-D__ARM_ARCH_5__",
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"-D__ARM_ARCH_5T__",
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"-D__ARM_ARCH_5E__",
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"-D__ARM_ARCH_5TE__",
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},
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"armv7-a": []string{
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"-march=armv7-a",
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"-mfloat-abi=softfp",
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"-mfpu=vfpv3-d16",
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},
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"armv7-a-neon": []string{
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"-mfloat-abi=softfp",
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"-mfpu=neon",
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},
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}
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armCpuVariantCflags = map[string][]string{
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"": []string{
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"-march=armv7-a",
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},
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"cortex-a7": []string{
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"-mcpu=cortex-a7",
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"-mfpu=neon-vfpv4",
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// Fake an ARM compiler flag as these processors support LPAE which GCC/clang
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// don't advertise.
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// TODO This is a hack and we need to add it for each processor that supports LPAE until some
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// better solution comes around. See Bug 27340895
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"-D__ARM_FEATURE_LPAE=1",
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},
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"cortex-a8": []string{
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"-mcpu=cortex-a8",
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},
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"cortex-a15": []string{
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"-mcpu=cortex-a15",
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"-mfpu=neon-vfpv4",
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// Fake an ARM compiler flag as these processors support LPAE which GCC/clang
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// don't advertise.
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// TODO This is a hack and we need to add it for each processor that supports LPAE until some
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// better solution comes around. See Bug 27340895
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"-D__ARM_FEATURE_LPAE=1",
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},
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"cortex-a53": []string{
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"-mcpu=cortex-a53",
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"-mfpu=neon-fp-armv8",
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// Fake an ARM compiler flag as these processors support LPAE which GCC/clang
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// don't advertise.
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// TODO This is a hack and we need to add it for each processor that supports LPAE until some
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// better solution comes around. See Bug 27340895
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"-D__ARM_FEATURE_LPAE=1",
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},
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"krait": []string{
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"-mcpu=cortex-a15",
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"-mfpu=neon-vfpv4",
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// Fake an ARM compiler flag as these processors support LPAE which GCC/clang
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// don't advertise.
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// TODO This is a hack and we need to add it for each processor that supports LPAE until some
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// better solution comes around. See Bug 27340895
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"-D__ARM_FEATURE_LPAE=1",
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},
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"kryo": []string{
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"-mcpu=cortex-a15",
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"-mfpu=neon-fp-armv8",
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// Fake an ARM compiler flag as these processors support LPAE which GCC/clang
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// don't advertise.
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// TODO This is a hack and we need to add it for each processor that supports LPAE until some
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// better solution comes around. See Bug 27340895
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"-D__ARM_FEATURE_LPAE=1",
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},
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}
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armClangCpuVariantCflags = copyVariantFlags(armCpuVariantCflags)
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armClangArchVariantCflags = copyVariantFlags(armArchVariantCflags)
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)
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const (
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armGccVersion = "4.9"
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)
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func init() {
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android.RegisterArchFeatures(android.Arm,
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"neon")
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android.RegisterArchVariants(android.Arm,
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"armv5te",
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"armv7-a",
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"armv7-a-neon",
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"cortex-a7",
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"cortex-a8",
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"cortex-a9",
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"cortex-a15",
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"cortex-a53",
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"cortex-a53-a57",
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"cortex-a73",
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"krait",
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"kryo",
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"exynos-m1",
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"exynos-m2",
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"denver")
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android.RegisterArchVariantFeatures(android.Arm, "armv7-a-neon", "neon")
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// Krait and Kryo targets are not supported by GCC, but are supported by Clang,
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// so override the definitions when building modules with Clang.
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replaceFirst(armClangCpuVariantCflags["krait"], "-mcpu=cortex-a15", "-mcpu=krait")
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replaceFirst(armClangCpuVariantCflags["kryo"], "-mcpu=cortex-a15", "-mcpu=krait")
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pctx.StaticVariable("armGccVersion", armGccVersion)
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pctx.SourcePathVariable("ArmGccRoot",
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"prebuilts/gcc/${HostPrebuiltTag}/arm/arm-linux-androideabi-${armGccVersion}")
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pctx.StaticVariable("ArmToolchainCflags", strings.Join(armToolchainCflags, " "))
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pctx.StaticVariable("ArmCflags", strings.Join(armCflags, " "))
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pctx.StaticVariable("ArmLdflags", strings.Join(armLdflags, " "))
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pctx.StaticVariable("ArmCppflags", strings.Join(armCppflags, " "))
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pctx.StaticVariable("ArmIncludeFlags", bionicHeaders("arm", "arm"))
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// Extended cflags
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// ARM vs. Thumb instruction set flags
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pctx.StaticVariable("ArmArmCflags", strings.Join(armArmCflags, " "))
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pctx.StaticVariable("ArmThumbCflags", strings.Join(armThumbCflags, " "))
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// Architecture variant cflags
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pctx.StaticVariable("ArmArmv5TECflags", strings.Join(armArchVariantCflags["armv5te"], " "))
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pctx.StaticVariable("ArmArmv7ACflags", strings.Join(armArchVariantCflags["armv7-a"], " "))
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pctx.StaticVariable("ArmArmv7ANeonCflags", strings.Join(armArchVariantCflags["armv7-a-neon"], " "))
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// Cpu variant cflags
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pctx.StaticVariable("ArmGenericCflags", strings.Join(armCpuVariantCflags[""], " "))
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pctx.StaticVariable("ArmCortexA7Cflags", strings.Join(armCpuVariantCflags["cortex-a7"], " "))
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pctx.StaticVariable("ArmCortexA8Cflags", strings.Join(armCpuVariantCflags["cortex-a8"], " "))
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pctx.StaticVariable("ArmCortexA15Cflags", strings.Join(armCpuVariantCflags["cortex-a15"], " "))
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pctx.StaticVariable("ArmCortexA53Cflags", strings.Join(armCpuVariantCflags["cortex-a53"], " "))
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pctx.StaticVariable("ArmKraitCflags", strings.Join(armCpuVariantCflags["krait"], " "))
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pctx.StaticVariable("ArmKryoCflags", strings.Join(armCpuVariantCflags["kryo"], " "))
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// Clang cflags
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pctx.StaticVariable("ArmToolchainClangCflags", strings.Join(ClangFilterUnknownCflags(armToolchainCflags), " "))
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pctx.StaticVariable("ArmClangCflags", strings.Join(ClangFilterUnknownCflags(armCflags), " "))
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pctx.StaticVariable("ArmClangLdflags", strings.Join(ClangFilterUnknownCflags(armLdflags), " "))
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pctx.StaticVariable("ArmClangCppflags", strings.Join(ClangFilterUnknownCflags(armCppflags), " "))
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// Clang ARM vs. Thumb instruction set cflags
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pctx.StaticVariable("ArmClangArmCflags", strings.Join(ClangFilterUnknownCflags(armArmCflags), " "))
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pctx.StaticVariable("ArmClangThumbCflags", strings.Join(ClangFilterUnknownCflags(armThumbCflags), " "))
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// Clang arch variant cflags
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pctx.StaticVariable("ArmClangArmv5TECflags",
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strings.Join(armClangArchVariantCflags["armv5te"], " "))
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pctx.StaticVariable("ArmClangArmv7ACflags",
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strings.Join(armClangArchVariantCflags["armv7-a"], " "))
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pctx.StaticVariable("ArmClangArmv7ANeonCflags",
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strings.Join(armClangArchVariantCflags["armv7-a-neon"], " "))
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// Clang cpu variant cflags
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pctx.StaticVariable("ArmClangGenericCflags",
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strings.Join(armClangCpuVariantCflags[""], " "))
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pctx.StaticVariable("ArmClangCortexA7Cflags",
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strings.Join(armClangCpuVariantCflags["cortex-a7"], " "))
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pctx.StaticVariable("ArmClangCortexA8Cflags",
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strings.Join(armClangCpuVariantCflags["cortex-a8"], " "))
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pctx.StaticVariable("ArmClangCortexA15Cflags",
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strings.Join(armClangCpuVariantCflags["cortex-a15"], " "))
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pctx.StaticVariable("ArmClangCortexA53Cflags",
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strings.Join(armClangCpuVariantCflags["cortex-a53"], " "))
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pctx.StaticVariable("ArmClangKraitCflags",
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strings.Join(armClangCpuVariantCflags["krait"], " "))
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pctx.StaticVariable("ArmClangKryoCflags",
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strings.Join(armClangCpuVariantCflags["kryo"], " "))
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}
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var (
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armArchVariantCflagsVar = map[string]string{
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"armv5te": "${config.ArmArmv5TECflags}",
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"armv7-a": "${config.ArmArmv7ACflags}",
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"armv7-a-neon": "${config.ArmArmv7ANeonCflags}",
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}
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armCpuVariantCflagsVar = map[string]string{
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"": "${config.ArmGenericCflags}",
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"cortex-a7": "${config.ArmCortexA7Cflags}",
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"cortex-a8": "${config.ArmCortexA8Cflags}",
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"cortex-a15": "${config.ArmCortexA15Cflags}",
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"cortex-a53": "${config.ArmCortexA53Cflags}",
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"cortex-a53.a57": "${config.ArmCortexA53Cflags}",
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"cortex-a73": "${config.ArmCortexA53Cflags}",
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"krait": "${config.ArmKraitCflags}",
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"kryo": "${config.ArmKryoCflags}",
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"exynos-m1": "${config.ArmCortexA53Cflags}",
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"exynos-m2": "${config.ArmCortexA53Cflags}",
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"denver": "${config.ArmCortexA15Cflags}",
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}
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armClangArchVariantCflagsVar = map[string]string{
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"armv5te": "${config.ArmClangArmv5TECflags}",
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"armv7-a": "${config.ArmClangArmv7ACflags}",
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"armv7-a-neon": "${config.ArmClangArmv7ANeonCflags}",
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}
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armClangCpuVariantCflagsVar = map[string]string{
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"": "${config.ArmClangGenericCflags}",
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"cortex-a7": "${config.ArmClangCortexA7Cflags}",
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"cortex-a8": "${config.ArmClangCortexA8Cflags}",
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"cortex-a15": "${config.ArmClangCortexA15Cflags}",
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"cortex-a53": "${config.ArmClangCortexA53Cflags}",
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"cortex-a53.a57": "${config.ArmClangCortexA53Cflags}",
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"cortex-a73": "${config.ArmClangCortexA53Cflags}",
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"krait": "${config.ArmClangKraitCflags}",
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"kryo": "${config.ArmClangKryoCflags}",
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"exynos-m1": "${config.ArmClangCortexA53Cflags}",
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"exynos-m2": "${config.ArmClangCortexA53Cflags}",
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"denver": "${config.ArmClangCortexA15Cflags}",
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}
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)
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type toolchainArm struct {
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toolchain32Bit
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ldflags string
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toolchainCflags, toolchainClangCflags string
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}
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func (t *toolchainArm) Name() string {
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return "arm"
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}
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func (t *toolchainArm) GccRoot() string {
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return "${config.ArmGccRoot}"
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}
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func (t *toolchainArm) GccTriple() string {
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return "arm-linux-androideabi"
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}
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func (t *toolchainArm) GccVersion() string {
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return armGccVersion
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}
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func (t *toolchainArm) ToolchainCflags() string {
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return t.toolchainCflags
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}
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func (t *toolchainArm) Cflags() string {
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return "${config.ArmCflags}"
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}
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func (t *toolchainArm) Cppflags() string {
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return "${config.ArmCppflags}"
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}
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func (t *toolchainArm) Ldflags() string {
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return t.ldflags
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}
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func (t *toolchainArm) IncludeFlags() string {
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return "${config.ArmIncludeFlags}"
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}
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func (t *toolchainArm) InstructionSetFlags(isa string) (string, error) {
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switch isa {
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case "arm":
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return "${config.ArmArmCflags}", nil
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case "thumb", "":
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return "${config.ArmThumbCflags}", nil
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default:
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return t.toolchainBase.InstructionSetFlags(isa)
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}
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}
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func (t *toolchainArm) ClangTriple() string {
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return t.GccTriple()
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}
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func (t *toolchainArm) ToolchainClangCflags() string {
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return t.toolchainClangCflags
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}
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func (t *toolchainArm) ClangCflags() string {
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return "${config.ArmClangCflags}"
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}
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func (t *toolchainArm) ClangCppflags() string {
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return "${config.ArmClangCppflags}"
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}
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func (t *toolchainArm) ClangLdflags() string {
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return t.ldflags
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}
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func (t *toolchainArm) ClangInstructionSetFlags(isa string) (string, error) {
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switch isa {
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case "arm":
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return "${config.ArmClangArmCflags}", nil
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case "thumb", "":
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return "${config.ArmClangThumbCflags}", nil
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default:
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return t.toolchainBase.ClangInstructionSetFlags(isa)
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}
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}
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func (toolchainArm) SanitizerRuntimeLibraryArch() string {
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return "arm"
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}
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func armToolchainFactory(arch android.Arch) Toolchain {
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var fixCortexA8 string
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toolchainCflags := make([]string, 2, 3)
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toolchainClangCflags := make([]string, 2, 3)
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toolchainCflags[0] = "${config.ArmToolchainCflags}"
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toolchainCflags[1] = armArchVariantCflagsVar[arch.ArchVariant]
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toolchainClangCflags[0] = "${config.ArmToolchainClangCflags}"
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toolchainClangCflags[1] = armClangArchVariantCflagsVar[arch.ArchVariant]
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switch arch.ArchVariant {
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case "armv7-a-neon":
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switch arch.CpuVariant {
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case "cortex-a8", "":
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// Generic ARM might be a Cortex A8 -- better safe than sorry
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fixCortexA8 = "-Wl,--fix-cortex-a8"
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default:
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fixCortexA8 = "-Wl,--no-fix-cortex-a8"
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}
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toolchainCflags = append(toolchainCflags,
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variantOrDefault(armCpuVariantCflagsVar, arch.CpuVariant))
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toolchainClangCflags = append(toolchainClangCflags,
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variantOrDefault(armClangCpuVariantCflagsVar, arch.CpuVariant))
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case "armv7-a":
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fixCortexA8 = "-Wl,--fix-cortex-a8"
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case "armv5te":
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// Nothing extra for armv5te
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default:
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panic(fmt.Sprintf("Unknown ARM architecture version: %q", arch.ArchVariant))
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}
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return &toolchainArm{
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toolchainCflags: strings.Join(toolchainCflags, " "),
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ldflags: strings.Join([]string{
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"${config.ArmLdflags}",
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fixCortexA8,
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}, " "),
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toolchainClangCflags: strings.Join(toolchainClangCflags, " "),
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}
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}
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func init() {
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registerToolchainFactory(android.Android, android.Arm, armToolchainFactory)
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}
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