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// Copyright 2020 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 (
"android/soong/android"
"strings"
)
var (
// This is a host toolchain but flags for device toolchain are required
// as the flags are actually for Bionic-based builds.
linuxCrossCflags = ClangFilterUnknownCflags(append(deviceGlobalCflags,
// clang by default enables PIC when the clang triple is set to *-android.
// See toolchain/llvm-project/clang/lib/Driver/ToolChains/CommonArgs.cpp#920.
// However, for this host target, we don't set "-android" to avoid __ANDROID__ macro
// which stands for "Android device target". Keeping PIC on is required because
// many modules we have (e.g. Bionic) assume PIC.
"-fpic",
))
linuxCrossLdflags = ClangFilterUnknownCflags([]string{
"-Wl,-z,noexecstack",
"-Wl,-z,relro",
"-Wl,-z,now",
"-Wl,--build-id=md5",
"-Wl,--warn-shared-textrel",
"-Wl,--fatal-warnings",
"-Wl,--hash-style=gnu",
"-Wl,--no-undefined-version",
})
)
func init() {
pctx.StaticVariable("LinuxBionicArm64Cflags", strings.Join(linuxCrossCflags, " "))
pctx.StaticVariable("LinuxBionicArm64Ldflags", strings.Join(linuxCrossLdflags, " "))
}
// toolchain config for ARM64 Linux CrossHost. Almost everything is the same as the ARM64 Android
// target. The overridden methods below show the differences.
type toolchainLinuxArm64 struct {
toolchainArm64
}
func (toolchainLinuxArm64) ClangTriple() string {
// Note the absence of "-android" suffix. The compiler won't define __ANDROID__
return "aarch64-linux"
}
func (toolchainLinuxArm64) ClangCflags() string {
// The inherited flags + extra flags
return "${config.Arm64ClangCflags} ${config.LinuxBionicArm64Cflags}"
}
func linuxArm64ToolchainFactory(arch android.Arch) Toolchain {
archVariant := "armv8-a" // for host, default to armv8-a
toolchainClangCflags := []string{arm64ClangArchVariantCflagsVar[archVariant]}
// We don't specify CPU architecture for host. Conservatively assume
// the host CPU needs the fix
extraLdflags := "-Wl,--fix-cortex-a53-843419"
ret := toolchainLinuxArm64{}
// add the extra ld and lld flags
ret.toolchainArm64.ldflags = strings.Join([]string{
"${config.Arm64Ldflags}",
"${config.LinuxBionicArm64Ldflags}",
extraLdflags,
}, " ")
ret.toolchainArm64.lldflags = strings.Join([]string{
"${config.Arm64Lldflags}",
"${config.LinuxBionicArm64Ldflags}",
extraLdflags,
}, " ")
ret.toolchainArm64.toolchainClangCflags = strings.Join(toolchainClangCflags, " ")
return &ret
}
func init() {
registerToolchainFactory(android.LinuxBionic, android.Arm64, linuxArm64ToolchainFactory)
}
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