a9b2aacf07
Add toolchains to support cross compiling to aarch64-linux-musl and arm-linux-musleabihf. Bug: 236052820 Test: build arm and arm64 musl sysroots Change-Id: I47a9322929baff2492c6e8db989ece01fcbeb133
112 lines
3.9 KiB
Go
112 lines
3.9 KiB
Go
// Copyright 2020 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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"strings"
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"android/soong/android"
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)
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var (
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// This is a host toolchain but flags for device toolchain are required
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// as the flags are actually for Bionic-based builds.
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linuxCrossCflags = append(deviceGlobalCflags,
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// clang by default enables PIC when the clang triple is set to *-android.
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// See toolchain/llvm-project/clang/lib/Driver/ToolChains/CommonArgs.cpp#920.
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// However, for this host target, we don't set "-android" to avoid __ANDROID__ macro
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// which stands for "Android device target". Keeping PIC on is required because
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// many modules we have (e.g. Bionic) assume PIC.
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"-fpic",
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// This is normally in ClangExtraTargetCflags, but that's for device and we need
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// the same for host
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"-nostdlibinc",
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)
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linuxCrossLdflags = []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,--fatal-warnings",
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"-Wl,--hash-style=gnu",
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"-Wl,--no-undefined-version",
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}
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// Embed the linker into host bionic binaries. This is needed to support host bionic,
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// as the linux kernel requires that the ELF interpreter referenced by PT_INTERP be
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// either an absolute path, or relative from CWD. To work around this, we extract
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// the load sections from the runtime linker ELF binary and embed them into each host
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// bionic binary, omitting the PT_INTERP declaration. The kernel will treat it as a static
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// binary, and then we use a special entry point to fix up the arguments passed by
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// the kernel before jumping to the embedded linker.
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linuxArm64CrtBeginSharedBinary = append(android.CopyOf(bionicCrtBeginSharedBinary),
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"host_bionic_linker_script")
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)
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func init() {
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pctx.StaticVariable("LinuxBionicArm64Cflags", strings.Join(linuxCrossCflags, " "))
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pctx.StaticVariable("LinuxBionicArm64Ldflags", strings.Join(linuxCrossLdflags, " "))
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}
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// toolchain config for ARM64 Linux CrossHost. Almost everything is the same as the ARM64 Android
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// target. The overridden methods below show the differences.
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type toolchainLinuxBionicArm64 struct {
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toolchainArm64
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}
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func (toolchainLinuxBionicArm64) ClangTriple() string {
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// Note the absence of "-android" suffix. The compiler won't define __ANDROID__
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return "aarch64-linux"
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}
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func (toolchainLinuxBionicArm64) Cflags() string {
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// The inherited flags + extra flags
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return "${config.Arm64Cflags} ${config.LinuxBionicArm64Cflags}"
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}
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func (toolchainLinuxBionicArm64) CrtBeginSharedBinary() []string {
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return linuxArm64CrtBeginSharedBinary
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}
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func linuxBionicArm64ToolchainFactory(arch android.Arch) Toolchain {
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archVariant := "armv8-a" // for host, default to armv8-a
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toolchainCflags := []string{arm64ArchVariantCflagsVar[archVariant]}
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// We don't specify CPU architecture for host. Conservatively assume
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// the host CPU needs the fix
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extraLdflags := "-Wl,--fix-cortex-a53-843419"
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ret := toolchainLinuxBionicArm64{}
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// add the extra ld and lld flags
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ret.toolchainArm64.ldflags = strings.Join([]string{
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"${config.Arm64Ldflags}",
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"${config.LinuxBionicArm64Ldflags}",
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extraLdflags,
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}, " ")
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ret.toolchainArm64.lldflags = strings.Join([]string{
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"${config.Arm64Lldflags}",
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"${config.LinuxBionicArm64Ldflags}",
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extraLdflags,
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}, " ")
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ret.toolchainArm64.toolchainCflags = strings.Join(toolchainCflags, " ")
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return &ret
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}
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func init() {
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registerToolchainFactory(android.LinuxBionic, android.Arm64, linuxBionicArm64ToolchainFactory)
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}
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