cc/makevars.go - platform/build/soong - Git at Google

 // Copyright 2016 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 cc

 import (
 	"fmt"
 	"sort"
 	"strings"

 	"android/soong/android"
 	"android/soong/cc/config"
 )

 func init() {
 	android.RegisterMakeVarsProvider(pctx, makeVarsProvider)
 }

 func makeVarsProvider(ctx android.MakeVarsContext) {
 	ctx.Strict("LLVM_RELEASE_VERSION", "${config.ClangShortVersion}")
 	ctx.Strict("LLVM_PREBUILTS_VERSION", "${config.ClangVersion}")
 	ctx.Strict("LLVM_PREBUILTS_BASE", "${config.ClangBase}")
 	ctx.Strict("LLVM_PREBUILTS_PATH", "${config.ClangBin}")
 	ctx.Strict("CLANG", "${config.ClangBin}/clang")
 	ctx.Strict("CLANG_CXX", "${config.ClangBin}/clang++")
 	ctx.Strict("LLVM_AS", "${config.ClangBin}/llvm-as")
 	ctx.Strict("LLVM_LINK", "${config.ClangBin}/llvm-link")
 	ctx.Strict("PATH_TO_CLANG_TIDY", "${config.ClangBin}/clang-tidy")
 	ctx.StrictSorted("CLANG_CONFIG_UNKNOWN_CFLAGS", strings.Join(config.ClangUnknownCflags, " "))

 	ctx.Strict("RS_LLVM_PREBUILTS_VERSION", "${config.RSClangVersion}")
 	ctx.Strict("RS_LLVM_PREBUILTS_BASE", "${config.RSClangBase}")
 	ctx.Strict("RS_LLVM_PREBUILTS_PATH", "${config.RSLLVMPrebuiltsPath}")
 	ctx.Strict("RS_LLVM_INCLUDES", "${config.RSIncludePath}")
 	ctx.Strict("RS_CLANG", "${config.RSLLVMPrebuiltsPath}/clang")
 	ctx.Strict("RS_LLVM_AS", "${config.RSLLVMPrebuiltsPath}/llvm-as")
 	ctx.Strict("RS_LLVM_LINK", "${config.RSLLVMPrebuiltsPath}/llvm-link")

 	ctx.Strict("GLOBAL_CFLAGS_NO_OVERRIDE", "${config.NoOverrideGlobalCflags}")
 	ctx.Strict("GLOBAL_CLANG_CFLAGS_NO_OVERRIDE", "${config.ClangExtraNoOverrideCflags}")
 	ctx.Strict("GLOBAL_CPPFLAGS_NO_OVERRIDE", "")
 	ctx.Strict("GLOBAL_CLANG_CPPFLAGS_NO_OVERRIDE", "")
 	ctx.Strict("NDK_PREBUILT_SHARED_LIBRARIES", strings.Join(ndkPrebuiltSharedLibs, " "))

 	if ctx.Config().ProductVariables.DeviceVndkVersion != nil {
 		ctx.Strict("BOARD_VNDK_VERSION", *ctx.Config().ProductVariables.DeviceVndkVersion)
 	} else {
 		ctx.Strict("BOARD_VNDK_VERSION", "")
 	}

 	ctx.Strict("ADDRESS_SANITIZER_CONFIG_EXTRA_CFLAGS", asanCflags)
 	ctx.Strict("ADDRESS_SANITIZER_CONFIG_EXTRA_LDFLAGS", asanLdflags)
 	ctx.Strict("ADDRESS_SANITIZER_CONFIG_EXTRA_STATIC_LIBRARIES", asanLibs)

 	ctx.Strict("CFI_EXTRA_CFLAGS", cfiCflags)
 	ctx.Strict("CFI_EXTRA_LDFLAGS", cfiLdflags)

 	ctx.Strict("DEFAULT_C_STD_VERSION", config.CStdVersion)
 	ctx.Strict("DEFAULT_CPP_STD_VERSION", config.CppStdVersion)
 	ctx.Strict("DEFAULT_GCC_CPP_STD_VERSION", config.GccCppStdVersion)
 	ctx.Strict("EXPERIMENTAL_C_STD_VERSION", config.ExperimentalCStdVersion)
 	ctx.Strict("EXPERIMENTAL_CPP_STD_VERSION", config.ExperimentalCppStdVersion)

 	ctx.Strict("DEFAULT_GLOBAL_TIDY_CHECKS", "${config.TidyDefaultGlobalChecks}")
 	ctx.Strict("DEFAULT_LOCAL_TIDY_CHECKS", joinLocalTidyChecks(config.DefaultLocalTidyChecks))
 	ctx.Strict("DEFAULT_TIDY_HEADER_DIRS", "${config.TidyDefaultHeaderDirs}")

 	ctx.Strict("AIDL_CPP", "${aidlCmd}")

 	ctx.Strict("RS_GLOBAL_INCLUDES", "${config.RsGlobalIncludes}")

 	includeFlags, err := ctx.Eval("${config.CommonGlobalIncludes}")
 	if err != nil {
 		panic(err)
 	}
 	includes, systemIncludes := splitSystemIncludes(ctx, includeFlags)
 	ctx.StrictRaw("SRC_HEADERS", strings.Join(includes, " "))
 	ctx.StrictRaw("SRC_SYSTEM_HEADERS", strings.Join(systemIncludes, " "))

 	sort.Strings(ndkMigratedLibs)
 	ctx.Strict("NDK_MIGRATED_LIBS", strings.Join(ndkMigratedLibs, " "))

 	hostTargets := ctx.Config().Targets[android.Host]
 	makeVarsToolchain(ctx, "", hostTargets[0])
 	if len(hostTargets) > 1 {
 		makeVarsToolchain(ctx, "2ND_", hostTargets[1])
 	}

 	crossTargets := ctx.Config().Targets[android.HostCross]
 	if len(crossTargets) > 0 {
 		makeVarsToolchain(ctx, "", crossTargets[0])
 		if len(crossTargets) > 1 {
 			makeVarsToolchain(ctx, "2ND_", crossTargets[1])
 		}
 	}

 	deviceTargets := ctx.Config().Targets[android.Device]
 	makeVarsToolchain(ctx, "", deviceTargets[0])
 	if len(deviceTargets) > 1 {
 		makeVarsToolchain(ctx, "2ND_", deviceTargets[1])
 	}
 }

 func makeVarsToolchain(ctx android.MakeVarsContext, secondPrefix string,
 	target android.Target) {
 	var typePrefix string
 	switch target.Os.Class {
 	case android.Host:
 		typePrefix = "HOST_"
 	case android.HostCross:
 		typePrefix = "HOST_CROSS_"
 	case android.Device:
 		typePrefix = "TARGET_"
 	}
 	makePrefix := secondPrefix + typePrefix

 	toolchain := config.FindToolchain(target.Os, target.Arch)

 	var productExtraCflags string
 	var productExtraLdflags string

 	hod := "Host"
 	if target.Os.Class == android.Device {
 		hod = "Device"
 	}

 	if target.Os.Class == android.Device && Bool(ctx.Config().ProductVariables.Brillo) {
 		productExtraCflags += "-D__BRILLO__"
 	}
 	if target.Os.Class == android.Host && Bool(ctx.Config().ProductVariables.HostStaticBinaries) {
 		productExtraLdflags += "-static"
 	}

 	ctx.Strict(makePrefix+"GLOBAL_CFLAGS", strings.Join([]string{
 		toolchain.Cflags(),
 		"${config.CommonGlobalCflags}",
 		fmt.Sprintf("${config.%sGlobalCflags}", hod),
 		toolchain.ToolchainCflags(),
 		productExtraCflags,
 	}, " "))
 	ctx.Strict(makePrefix+"GLOBAL_CONLYFLAGS", strings.Join([]string{
 		"${config.CommonGlobalConlyflags}",
 	}, " "))
 	ctx.Strict(makePrefix+"GLOBAL_CPPFLAGS", strings.Join([]string{
 		"${config.CommonGlobalCppflags}",
 		toolchain.Cppflags(),
 	}, " "))
 	ctx.Strict(makePrefix+"GLOBAL_LDFLAGS", strings.Join([]string{
 		toolchain.Ldflags(),
 		toolchain.ToolchainLdflags(),
 		productExtraLdflags,
 	}, " "))

 	includeFlags, err := ctx.Eval(toolchain.IncludeFlags())
 	if err != nil {
 		panic(err)
 	}
 	includes, systemIncludes := splitSystemIncludes(ctx, includeFlags)
 	ctx.StrictRaw(makePrefix+"C_INCLUDES", strings.Join(includes, " "))
 	ctx.StrictRaw(makePrefix+"C_SYSTEM_INCLUDES", strings.Join(systemIncludes, " "))

 	if target.Arch.ArchType == android.Arm {
 		flags, err := toolchain.InstructionSetFlags("arm")
 		if err != nil {
 			panic(err)
 		}
 		ctx.Strict(makePrefix+"arm_CFLAGS", flags)

 		flags, err = toolchain.InstructionSetFlags("thumb")
 		if err != nil {
 			panic(err)
 		}
 		ctx.Strict(makePrefix+"thumb_CFLAGS", flags)
 	}

 	if toolchain.ClangSupported() {
 		clangPrefix := secondPrefix + "CLANG_" + typePrefix
 		clangExtras := "-target " + toolchain.ClangTriple()
 		clangExtras += " -B" + config.ToolPath(toolchain)

 		ctx.Strict(clangPrefix+"GLOBAL_CFLAGS", strings.Join([]string{
 			toolchain.ClangCflags(),
 			"${config.CommonClangGlobalCflags}",
 			fmt.Sprintf("${config.%sClangGlobalCflags}", hod),
 			toolchain.ToolchainClangCflags(),
 			clangExtras,
 			productExtraCflags,
 		}, " "))
 		ctx.Strict(clangPrefix+"GLOBAL_CPPFLAGS", strings.Join([]string{
 			"${config.CommonClangGlobalCppflags}",
 			toolchain.ClangCppflags(),
 		}, " "))
 		ctx.Strict(clangPrefix+"GLOBAL_LDFLAGS", strings.Join([]string{
 			toolchain.ClangLdflags(),
 			toolchain.ToolchainClangLdflags(),
 			productExtraLdflags,
 			clangExtras,
 		}, " "))

 		if target.Os.Class == android.Device {
 			ctx.Strict(secondPrefix+"ADDRESS_SANITIZER_RUNTIME_LIBRARY", strings.TrimSuffix(config.AddressSanitizerRuntimeLibrary(toolchain), ".so"))
 			ctx.Strict(secondPrefix+"UBSAN_RUNTIME_LIBRARY", strings.TrimSuffix(config.UndefinedBehaviorSanitizerRuntimeLibrary(toolchain), ".so"))
 			ctx.Strict(secondPrefix+"TSAN_RUNTIME_LIBRARY", strings.TrimSuffix(config.ThreadSanitizerRuntimeLibrary(toolchain), ".so"))
 		}

 		// This is used by external/gentoo/...
 		ctx.Strict("CLANG_CONFIG_"+target.Arch.ArchType.Name+"_"+typePrefix+"TRIPLE",
 			toolchain.ClangTriple())
 	}

 	ctx.Strict(makePrefix+"CC", gccCmd(toolchain, "gcc"))
 	ctx.Strict(makePrefix+"CXX", gccCmd(toolchain, "g++"))

 	if target.Os == android.Darwin {
 		ctx.Strict(makePrefix+"AR", "${config.MacArPath}")
 	} else {
 		ctx.Strict(makePrefix+"AR", gccCmd(toolchain, "ar"))
 		ctx.Strict(makePrefix+"READELF", gccCmd(toolchain, "readelf"))
 		ctx.Strict(makePrefix+"NM", gccCmd(toolchain, "nm"))
 	}

 	if target.Os == android.Windows {
 		ctx.Strict(makePrefix+"OBJDUMP", gccCmd(toolchain, "objdump"))
 	}

 	if target.Os.Class == android.Device {
 		ctx.Strict(makePrefix+"OBJCOPY", gccCmd(toolchain, "objcopy"))
 		ctx.Strict(makePrefix+"LD", gccCmd(toolchain, "ld"))
 		ctx.Strict(makePrefix+"STRIP", gccCmd(toolchain, "strip"))
 		ctx.Strict(makePrefix+"GCC_VERSION", toolchain.GccVersion())
 		ctx.Strict(makePrefix+"NDK_GCC_VERSION", toolchain.GccVersion())
 		ctx.Strict(makePrefix+"NDK_TRIPLE", toolchain.ClangTriple())
 	}

 	ctx.Strict(makePrefix+"TOOLCHAIN_ROOT", toolchain.GccRoot())
 	ctx.Strict(makePrefix+"TOOLS_PREFIX", gccCmd(toolchain, ""))
 	ctx.Strict(makePrefix+"SHLIB_SUFFIX", toolchain.ShlibSuffix())
 	ctx.Strict(makePrefix+"EXECUTABLE_SUFFIX", toolchain.ExecutableSuffix())
 }

 func splitSystemIncludes(ctx android.MakeVarsContext, val string) (includes, systemIncludes []string) {
 	flags, err := ctx.Eval(val)
 	if err != nil {
 		panic(err)
 	}

 	extract := func(flags string, dirs []string, prefix string) (string, []string, bool) {
 		if strings.HasPrefix(flags, prefix) {
 			flags = strings.TrimPrefix(flags, prefix)
 			flags = strings.TrimLeft(flags, " ")
 			s := strings.SplitN(flags, " ", 2)
 			dirs = append(dirs, s[0])
 			if len(s) > 1 {
 				return strings.TrimLeft(s[1], " "), dirs, true
 			}
 			return "", dirs, true
 		} else {
 			return flags, dirs, false
 		}
 	}

 	flags = strings.TrimLeft(flags, " ")
 	for flags != "" {
 		found := false
 		flags, includes, found = extract(flags, includes, "-I")
 		if !found {
 			flags, systemIncludes, found = extract(flags, systemIncludes, "-isystem ")
 		}
 		if !found {
 			panic(fmt.Errorf("Unexpected flag in %q", flags))
 		}
 	}

 	return includes, systemIncludes
 }

 func joinLocalTidyChecks(checks []config.PathBasedTidyCheck) string {
 	rets := make([]string, len(checks))
 	for i, check := range config.DefaultLocalTidyChecks {
 		rets[i] = check.PathPrefix + ":" + check.Checks
 	}
 	return strings.Join(rets, " ")
 }
	// Copyright 2016 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 cc

	import (
	"fmt"
	"sort"
	"strings"

	"android/soong/android"
	"android/soong/cc/config"
	)

	func init() {
	android.RegisterMakeVarsProvider(pctx, makeVarsProvider)
	}

	func makeVarsProvider(ctx android.MakeVarsContext) {
	ctx.Strict("LLVM_RELEASE_VERSION", "${config.ClangShortVersion}")
	ctx.Strict("LLVM_PREBUILTS_VERSION", "${config.ClangVersion}")
	ctx.Strict("LLVM_PREBUILTS_BASE", "${config.ClangBase}")
	ctx.Strict("LLVM_PREBUILTS_PATH", "${config.ClangBin}")
	ctx.Strict("CLANG", "${config.ClangBin}/clang")
	ctx.Strict("CLANG_CXX", "${config.ClangBin}/clang++")
	ctx.Strict("LLVM_AS", "${config.ClangBin}/llvm-as")
	ctx.Strict("LLVM_LINK", "${config.ClangBin}/llvm-link")
	ctx.Strict("PATH_TO_CLANG_TIDY", "${config.ClangBin}/clang-tidy")
	ctx.StrictSorted("CLANG_CONFIG_UNKNOWN_CFLAGS", strings.Join(config.ClangUnknownCflags, " "))

	ctx.Strict("RS_LLVM_PREBUILTS_VERSION", "${config.RSClangVersion}")
	ctx.Strict("RS_LLVM_PREBUILTS_BASE", "${config.RSClangBase}")
	ctx.Strict("RS_LLVM_PREBUILTS_PATH", "${config.RSLLVMPrebuiltsPath}")
	ctx.Strict("RS_LLVM_INCLUDES", "${config.RSIncludePath}")
	ctx.Strict("RS_CLANG", "${config.RSLLVMPrebuiltsPath}/clang")
	ctx.Strict("RS_LLVM_AS", "${config.RSLLVMPrebuiltsPath}/llvm-as")
	ctx.Strict("RS_LLVM_LINK", "${config.RSLLVMPrebuiltsPath}/llvm-link")

	ctx.Strict("GLOBAL_CFLAGS_NO_OVERRIDE", "${config.NoOverrideGlobalCflags}")
	ctx.Strict("GLOBAL_CLANG_CFLAGS_NO_OVERRIDE", "${config.ClangExtraNoOverrideCflags}")
	ctx.Strict("GLOBAL_CPPFLAGS_NO_OVERRIDE", "")
	ctx.Strict("GLOBAL_CLANG_CPPFLAGS_NO_OVERRIDE", "")
	ctx.Strict("NDK_PREBUILT_SHARED_LIBRARIES", strings.Join(ndkPrebuiltSharedLibs, " "))

	if ctx.Config().ProductVariables.DeviceVndkVersion != nil {
	ctx.Strict("BOARD_VNDK_VERSION", *ctx.Config().ProductVariables.DeviceVndkVersion)
	} else {
	ctx.Strict("BOARD_VNDK_VERSION", "")
	}

	ctx.Strict("ADDRESS_SANITIZER_CONFIG_EXTRA_CFLAGS", asanCflags)
	ctx.Strict("ADDRESS_SANITIZER_CONFIG_EXTRA_LDFLAGS", asanLdflags)
	ctx.Strict("ADDRESS_SANITIZER_CONFIG_EXTRA_STATIC_LIBRARIES", asanLibs)

	ctx.Strict("CFI_EXTRA_CFLAGS", cfiCflags)
	ctx.Strict("CFI_EXTRA_LDFLAGS", cfiLdflags)

	ctx.Strict("DEFAULT_C_STD_VERSION", config.CStdVersion)
	ctx.Strict("DEFAULT_CPP_STD_VERSION", config.CppStdVersion)
	ctx.Strict("DEFAULT_GCC_CPP_STD_VERSION", config.GccCppStdVersion)
	ctx.Strict("EXPERIMENTAL_C_STD_VERSION", config.ExperimentalCStdVersion)
	ctx.Strict("EXPERIMENTAL_CPP_STD_VERSION", config.ExperimentalCppStdVersion)

	ctx.Strict("DEFAULT_GLOBAL_TIDY_CHECKS", "${config.TidyDefaultGlobalChecks}")
	ctx.Strict("DEFAULT_LOCAL_TIDY_CHECKS", joinLocalTidyChecks(config.DefaultLocalTidyChecks))
	ctx.Strict("DEFAULT_TIDY_HEADER_DIRS", "${config.TidyDefaultHeaderDirs}")

	ctx.Strict("AIDL_CPP", "${aidlCmd}")

	ctx.Strict("RS_GLOBAL_INCLUDES", "${config.RsGlobalIncludes}")

	includeFlags, err := ctx.Eval("${config.CommonGlobalIncludes}")
	if err != nil {
	panic(err)
	}
	includes, systemIncludes := splitSystemIncludes(ctx, includeFlags)
	ctx.StrictRaw("SRC_HEADERS", strings.Join(includes, " "))
	ctx.StrictRaw("SRC_SYSTEM_HEADERS", strings.Join(systemIncludes, " "))

	sort.Strings(ndkMigratedLibs)
	ctx.Strict("NDK_MIGRATED_LIBS", strings.Join(ndkMigratedLibs, " "))

	hostTargets := ctx.Config().Targets[android.Host]
	makeVarsToolchain(ctx, "", hostTargets[0])
	if len(hostTargets) > 1 {
	makeVarsToolchain(ctx, "2ND_", hostTargets[1])
	}

	crossTargets := ctx.Config().Targets[android.HostCross]
	if len(crossTargets) > 0 {
	makeVarsToolchain(ctx, "", crossTargets[0])
	if len(crossTargets) > 1 {
	makeVarsToolchain(ctx, "2ND_", crossTargets[1])
	}
	}

	deviceTargets := ctx.Config().Targets[android.Device]
	makeVarsToolchain(ctx, "", deviceTargets[0])
	if len(deviceTargets) > 1 {
	makeVarsToolchain(ctx, "2ND_", deviceTargets[1])
	}
	}

	func makeVarsToolchain(ctx android.MakeVarsContext, secondPrefix string,
	target android.Target) {
	var typePrefix string
	switch target.Os.Class {
	case android.Host:
	typePrefix = "HOST_"
	case android.HostCross:
	typePrefix = "HOST_CROSS_"
	case android.Device:
	typePrefix = "TARGET_"
	}
	makePrefix := secondPrefix + typePrefix

	toolchain := config.FindToolchain(target.Os, target.Arch)

	var productExtraCflags string
	var productExtraLdflags string

	hod := "Host"
	if target.Os.Class == android.Device {
	hod = "Device"
	}

	if target.Os.Class == android.Device && Bool(ctx.Config().ProductVariables.Brillo) {
	productExtraCflags += "-D__BRILLO__"
	}
	if target.Os.Class == android.Host && Bool(ctx.Config().ProductVariables.HostStaticBinaries) {
	productExtraLdflags += "-static"
	}

	ctx.Strict(makePrefix+"GLOBAL_CFLAGS", strings.Join([]string{
	toolchain.Cflags(),
	"${config.CommonGlobalCflags}",
	fmt.Sprintf("${config.%sGlobalCflags}", hod),
	toolchain.ToolchainCflags(),
	productExtraCflags,
	}, " "))
	ctx.Strict(makePrefix+"GLOBAL_CONLYFLAGS", strings.Join([]string{
	"${config.CommonGlobalConlyflags}",
	}, " "))
	ctx.Strict(makePrefix+"GLOBAL_CPPFLAGS", strings.Join([]string{
	"${config.CommonGlobalCppflags}",
	toolchain.Cppflags(),
	}, " "))
	ctx.Strict(makePrefix+"GLOBAL_LDFLAGS", strings.Join([]string{
	toolchain.Ldflags(),
	toolchain.ToolchainLdflags(),
	productExtraLdflags,
	}, " "))

	includeFlags, err := ctx.Eval(toolchain.IncludeFlags())
	if err != nil {
	panic(err)
	}
	includes, systemIncludes := splitSystemIncludes(ctx, includeFlags)
	ctx.StrictRaw(makePrefix+"C_INCLUDES", strings.Join(includes, " "))
	ctx.StrictRaw(makePrefix+"C_SYSTEM_INCLUDES", strings.Join(systemIncludes, " "))

	if target.Arch.ArchType == android.Arm {
	flags, err := toolchain.InstructionSetFlags("arm")
	if err != nil {
	panic(err)
	}
	ctx.Strict(makePrefix+"arm_CFLAGS", flags)

	flags, err = toolchain.InstructionSetFlags("thumb")
	if err != nil {
	panic(err)
	}
	ctx.Strict(makePrefix+"thumb_CFLAGS", flags)
	}

	if toolchain.ClangSupported() {
	clangPrefix := secondPrefix + "CLANG_" + typePrefix
	clangExtras := "-target " + toolchain.ClangTriple()
	clangExtras += " -B" + config.ToolPath(toolchain)

	ctx.Strict(clangPrefix+"GLOBAL_CFLAGS", strings.Join([]string{
	toolchain.ClangCflags(),
	"${config.CommonClangGlobalCflags}",
	fmt.Sprintf("${config.%sClangGlobalCflags}", hod),
	toolchain.ToolchainClangCflags(),
	clangExtras,
	productExtraCflags,
	}, " "))
	ctx.Strict(clangPrefix+"GLOBAL_CPPFLAGS", strings.Join([]string{
	"${config.CommonClangGlobalCppflags}",
	toolchain.ClangCppflags(),
	}, " "))
	ctx.Strict(clangPrefix+"GLOBAL_LDFLAGS", strings.Join([]string{
	toolchain.ClangLdflags(),
	toolchain.ToolchainClangLdflags(),
	productExtraLdflags,
	clangExtras,
	}, " "))

	if target.Os.Class == android.Device {
	ctx.Strict(secondPrefix+"ADDRESS_SANITIZER_RUNTIME_LIBRARY", strings.TrimSuffix(config.AddressSanitizerRuntimeLibrary(toolchain), ".so"))
	ctx.Strict(secondPrefix+"UBSAN_RUNTIME_LIBRARY", strings.TrimSuffix(config.UndefinedBehaviorSanitizerRuntimeLibrary(toolchain), ".so"))
	ctx.Strict(secondPrefix+"TSAN_RUNTIME_LIBRARY", strings.TrimSuffix(config.ThreadSanitizerRuntimeLibrary(toolchain), ".so"))
	}

	// This is used by external/gentoo/...
	ctx.Strict("CLANG_CONFIG_"+target.Arch.ArchType.Name+"_"+typePrefix+"TRIPLE",
	toolchain.ClangTriple())
	}

	ctx.Strict(makePrefix+"CC", gccCmd(toolchain, "gcc"))
	ctx.Strict(makePrefix+"CXX", gccCmd(toolchain, "g++"))

	if target.Os == android.Darwin {
	ctx.Strict(makePrefix+"AR", "${config.MacArPath}")
	} else {
	ctx.Strict(makePrefix+"AR", gccCmd(toolchain, "ar"))
	ctx.Strict(makePrefix+"READELF", gccCmd(toolchain, "readelf"))
	ctx.Strict(makePrefix+"NM", gccCmd(toolchain, "nm"))
	}

	if target.Os == android.Windows {
	ctx.Strict(makePrefix+"OBJDUMP", gccCmd(toolchain, "objdump"))
	}

	if target.Os.Class == android.Device {
	ctx.Strict(makePrefix+"OBJCOPY", gccCmd(toolchain, "objcopy"))
	ctx.Strict(makePrefix+"LD", gccCmd(toolchain, "ld"))
	ctx.Strict(makePrefix+"STRIP", gccCmd(toolchain, "strip"))
	ctx.Strict(makePrefix+"GCC_VERSION", toolchain.GccVersion())
	ctx.Strict(makePrefix+"NDK_GCC_VERSION", toolchain.GccVersion())
	ctx.Strict(makePrefix+"NDK_TRIPLE", toolchain.ClangTriple())
	}

	ctx.Strict(makePrefix+"TOOLCHAIN_ROOT", toolchain.GccRoot())
	ctx.Strict(makePrefix+"TOOLS_PREFIX", gccCmd(toolchain, ""))
	ctx.Strict(makePrefix+"SHLIB_SUFFIX", toolchain.ShlibSuffix())
	ctx.Strict(makePrefix+"EXECUTABLE_SUFFIX", toolchain.ExecutableSuffix())
	}

	func splitSystemIncludes(ctx android.MakeVarsContext, val string) (includes, systemIncludes []string) {
	flags, err := ctx.Eval(val)
	if err != nil {
	panic(err)
	}

	extract := func(flags string, dirs []string, prefix string) (string, []string, bool) {
	if strings.HasPrefix(flags, prefix) {
	flags = strings.TrimPrefix(flags, prefix)
	flags = strings.TrimLeft(flags, " ")
	s := strings.SplitN(flags, " ", 2)
	dirs = append(dirs, s[0])
	if len(s) > 1 {
	return strings.TrimLeft(s[1], " "), dirs, true
	}
	return "", dirs, true
	} else {
	return flags, dirs, false
	}
	}

	flags = strings.TrimLeft(flags, " ")
	for flags != "" {
	found := false
	flags, includes, found = extract(flags, includes, "-I")
	if !found {
	flags, systemIncludes, found = extract(flags, systemIncludes, "-isystem ")
	}
	if !found {
	panic(fmt.Errorf("Unexpected flag in %q", flags))
	}
	}

	return includes, systemIncludes
	}

	func joinLocalTidyChecks(checks []config.PathBasedTidyCheck) string {
	rets := make([]string, len(checks))
	for i, check := range config.DefaultLocalTidyChecks {
	rets[i] = check.PathPrefix + ":" + check.Checks
	}
	return strings.Join(rets, " ")
	}