4afa2e2682
LinuxBionic now supports arm64 architecture in addition to the existing x86_64 arch. This is to make it possible to build host tools like adb, fastboot, crosvm, etc. for Linux/ARM on regular Linux/x86 machines. The arm64 target can be selected in various ways in Android.bp files: - target.host (because this is still considered as a host target) - target.linux (provided that the module is also enabled for host) - target.linux_bionic (use the OS name directly) - target.linux_bionic_arm64 (OS name + arch combo) - target.linux_arm64 (provided that the module is also for host) - target.not_windows - arch.arm64 The toolchain for the new target is almost the same as the toolchain config for Android/ARM64. One notable difference is that the clang triple is aarch64-linux instead of aarch64-linux-android, so that __ANDROID__ is not defined for the new OS type. Bug: 134795810 Test: HOST_CROSS_OS=linux_bionic HOST_CROSS_ARCH=arm64 m nothing Change-Id: If4300583edfb6d75bd4d984b38f73b6a406b4447
94 lines
3.1 KiB
Go
94 lines
3.1 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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"android/soong/android"
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"strings"
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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 = ClangFilterUnknownCflags(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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))
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linuxCrossLdflags = ClangFilterUnknownCflags([]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,--hash-style=gnu",
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"-Wl,--no-undefined-version",
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})
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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 toolchainLinuxArm64 struct {
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toolchainArm64
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}
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func (toolchainLinuxArm64) 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 (toolchainLinuxArm64) ClangCflags() string {
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// The inherited flags + extra flags
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return "${config.Arm64ClangCflags} ${config.LinuxBionicArm64Cflags}"
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}
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func linuxArm64ToolchainFactory(arch android.Arch) Toolchain {
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archVariant := "armv8-a" // for host, default to armv8-a
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toolchainClangCflags := []string{arm64ClangArchVariantCflagsVar[archVariant]}
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// We don't specify CPU architecture for host. Conservatively assume
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// the host CPU needs the fix
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extraLdflags := "-Wl,--fix-cortex-a53-843419"
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ret := toolchainLinuxArm64{}
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// add the extra ld and lld flags
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ret.toolchainArm64.ldflags = strings.Join([]string{
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"${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.toolchainClangCflags = strings.Join(toolchainClangCflags, " ")
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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, linuxArm64ToolchainFactory)
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}
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