1// Copyright 2016 Google Inc. All rights reserved. 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15package config 16 17import ( 18 "android/soong/android" 19 "strings" 20) 21 22var ( 23 linuxBionicCflags = []string{ 24 "-Wa,--noexecstack", 25 26 "-fPIC", 27 28 "-U_FORTIFY_SOURCE", 29 "-D_FORTIFY_SOURCE=2", 30 "-fstack-protector-strong", 31 32 // From x86_64_device 33 "-ffunction-sections", 34 "-fno-short-enums", 35 "-funwind-tables", 36 37 // Tell clang where the gcc toolchain is 38 "--gcc-toolchain=${LinuxBionicGccRoot}", 39 40 // This is normally in ClangExtraTargetCflags, but this is considered host 41 "-nostdlibinc", 42 } 43 44 linuxBionicLdflags = []string{ 45 "-Wl,-z,noexecstack", 46 "-Wl,-z,relro", 47 "-Wl,-z,now", 48 "-Wl,--build-id=md5", 49 "-Wl,--fatal-warnings", 50 "-Wl,--no-undefined-version", 51 52 // Use the device gcc toolchain 53 "--gcc-toolchain=${LinuxBionicGccRoot}", 54 } 55 56 linuxBionicLldflags = append(linuxBionicLdflags, 57 "-Wl,--compress-debug-sections=zstd", 58 ) 59 60 // Embed the linker into host bionic binaries. This is needed to support host bionic, 61 // as the linux kernel requires that the ELF interpreter referenced by PT_INTERP be 62 // either an absolute path, or relative from CWD. To work around this, we extract 63 // the load sections from the runtime linker ELF binary and embed them into each host 64 // bionic binary, omitting the PT_INTERP declaration. The kernel will treat it as a static 65 // binary, and then we use a special entry point to fix up the arguments passed by 66 // the kernel before jumping to the embedded linker. 67 linuxBionicCrtBeginSharedBinary = append(android.CopyOf(bionicCrtBeginSharedBinary), 68 "host_bionic_linker_script") 69) 70 71const ( 72 x86_64GccVersion = "4.9" 73) 74 75func init() { 76 pctx.StaticVariable("LinuxBionicCflags", strings.Join(linuxBionicCflags, " ")) 77 pctx.StaticVariable("LinuxBionicLdflags", strings.Join(linuxBionicLdflags, " ")) 78 pctx.StaticVariable("LinuxBionicLldflags", strings.Join(linuxBionicLldflags, " ")) 79 80 // Use the device gcc toolchain for now 81 pctx.StaticVariable("LinuxBionicGccVersion", x86_64GccVersion) 82 pctx.SourcePathVariable("LinuxBionicGccRoot", 83 "prebuilts/gcc/${HostPrebuiltTag}/x86/x86_64-linux-android-${LinuxBionicGccVersion}") 84} 85 86type toolchainLinuxBionic struct { 87 toolchain64Bit 88 toolchainBionic 89} 90 91func (t *toolchainLinuxBionic) Name() string { 92 return "x86_64" 93} 94 95func (t *toolchainLinuxBionic) IncludeFlags() string { 96 return "" 97} 98 99func (t *toolchainLinuxBionic) ClangTriple() string { 100 // TODO: we don't have a triple yet b/31393676 101 return "x86_64-linux-android" 102} 103 104func (t *toolchainLinuxBionic) Cflags() string { 105 return "${config.LinuxBionicCflags}" 106} 107 108func (t *toolchainLinuxBionic) Cppflags() string { 109 return "" 110} 111 112func (t *toolchainLinuxBionic) Ldflags() string { 113 return "${config.LinuxBionicLdflags}" 114} 115 116func (t *toolchainLinuxBionic) Lldflags() string { 117 return "${config.LinuxBionicLldflags}" 118} 119 120func (t *toolchainLinuxBionic) ToolchainCflags() string { 121 return "-m64 -march=x86-64" + 122 // TODO: We're not really android, but we don't have a triple yet b/31393676 123 " -U__ANDROID__" 124} 125 126func (t *toolchainLinuxBionic) ToolchainLdflags() string { 127 return "-m64" 128} 129 130func (t *toolchainLinuxBionic) AvailableLibraries() []string { 131 return nil 132} 133 134func (toolchainLinuxBionic) LibclangRuntimeLibraryArch() string { 135 return "x86_64" 136} 137 138func (toolchainLinuxBionic) CrtBeginSharedBinary() []string { 139 return linuxBionicCrtBeginSharedBinary 140} 141 142var toolchainLinuxBionicSingleton Toolchain = &toolchainLinuxBionic{} 143 144func linuxBionicToolchainFactory(arch android.Arch) Toolchain { 145 return toolchainLinuxBionicSingleton 146} 147 148func init() { 149 registerToolchainFactory(android.LinuxBionic, android.X86_64, linuxBionicToolchainFactory) 150} 151