a66590a98d
This flag has never done anything for ld.lld, since it has this behavior by default (and actually can't turn it off either). It's now being removed as a valid flag from ld.lld, so it's time for Android to drop the unnecessary flags. See https://reviews.llvm.org/D118942. Test: builds Change-Id: I22c344b7a55e275c1fbd5fef25f85e97a39de5c4
154 lines
4.1 KiB
Go
154 lines
4.1 KiB
Go
// Copyright 2016 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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linuxBionicCflags = []string{
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"-Wa,--noexecstack",
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"-fPIC",
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"-U_FORTIFY_SOURCE",
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"-D_FORTIFY_SOURCE=2",
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"-fstack-protector-strong",
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// From x86_64_device
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"-ffunction-sections",
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"-fno-short-enums",
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"-funwind-tables",
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// Tell clang where the gcc toolchain is
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"--gcc-toolchain=${LinuxBionicGccRoot}",
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// This is normally in ClangExtraTargetCflags, but this is considered host
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"-nostdlibinc",
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}
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linuxBionicLdflags = []string{
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"-Wl,-z,noexecstack",
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"-Wl,-z,relro",
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"-Wl,-z,now",
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"-Wl,--build-id=md5",
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"-Wl,--fatal-warnings",
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"-Wl,--hash-style=gnu",
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"-Wl,--no-undefined-version",
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// Use the device gcc toolchain
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"--gcc-toolchain=${LinuxBionicGccRoot}",
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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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linuxBionicCrtBeginSharedBinary = 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("LinuxBionicCflags", strings.Join(linuxBionicCflags, " "))
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pctx.StaticVariable("LinuxBionicLdflags", strings.Join(linuxBionicLdflags, " "))
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pctx.StaticVariable("LinuxBionicLldflags", strings.Join(linuxBionicLdflags, " "))
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// Use the device gcc toolchain for now
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pctx.StaticVariable("LinuxBionicGccRoot", "${X86_64GccRoot}")
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}
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type toolchainLinuxBionic struct {
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toolchain64Bit
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toolchainBionic
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}
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func (t *toolchainLinuxBionic) Name() string {
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return "x86_64"
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}
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func (t *toolchainLinuxBionic) GccRoot() string {
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return "${config.LinuxBionicGccRoot}"
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}
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func (t *toolchainLinuxBionic) GccTriple() string {
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return "x86_64-linux-android"
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}
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func (t *toolchainLinuxBionic) GccVersion() string {
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return "4.9"
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}
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func (t *toolchainLinuxBionic) IncludeFlags() string {
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return ""
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}
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func (t *toolchainLinuxBionic) ClangTriple() string {
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// TODO: we don't have a triple yet b/31393676
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return "x86_64-linux-android"
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}
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func (t *toolchainLinuxBionic) Cflags() string {
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return "${config.LinuxBionicCflags}"
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}
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func (t *toolchainLinuxBionic) Cppflags() string {
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return ""
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}
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func (t *toolchainLinuxBionic) Ldflags() string {
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return "${config.LinuxBionicLdflags}"
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}
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func (t *toolchainLinuxBionic) Lldflags() string {
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return "${config.LinuxBionicLldflags}"
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}
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func (t *toolchainLinuxBionic) ToolchainCflags() string {
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return "-m64 -march=x86-64" +
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// TODO: We're not really android, but we don't have a triple yet b/31393676
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" -U__ANDROID__"
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}
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func (t *toolchainLinuxBionic) ToolchainLdflags() string {
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return "-m64"
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}
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func (t *toolchainLinuxBionic) AvailableLibraries() []string {
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return nil
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}
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func (toolchainLinuxBionic) LibclangRuntimeLibraryArch() string {
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return "x86_64"
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}
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func (toolchainLinuxBionic) CrtBeginSharedBinary() []string {
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return linuxBionicCrtBeginSharedBinary
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}
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var toolchainLinuxBionicSingleton Toolchain = &toolchainLinuxBionic{}
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func linuxBionicToolchainFactory(arch android.Arch) Toolchain {
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return toolchainLinuxBionicSingleton
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}
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func init() {
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registerToolchainFactory(android.LinuxBionic, android.X86_64, linuxBionicToolchainFactory)
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}
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