cc/compiler.go - SHIFTPHONES/android_build_soong - Gitiles

 // 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"
 	"path/filepath"
 	"strings"

 	"github.com/google/blueprint/proptools"

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

 // This file contains the basic C/C++/assembly to .o compliation steps

 type BaseCompilerProperties struct {
 	// list of source files used to compile the C/C++ module.  May be .c, .cpp, or .S files.
 	Srcs []string `android:"arch_variant"`

 	// list of source files that should not be used to build the C/C++ module.
 	// This is most useful in the arch/multilib variants to remove non-common files
 	Exclude_srcs []string `android:"arch_variant"`

 	// list of module-specific flags that will be used for C and C++ compiles.
 	Cflags []string `android:"arch_variant"`

 	// list of module-specific flags that will be used for C++ compiles
 	Cppflags []string `android:"arch_variant"`

 	// list of module-specific flags that will be used for C compiles
 	Conlyflags []string `android:"arch_variant"`

 	// list of module-specific flags that will be used for .S compiles
 	Asflags []string `android:"arch_variant"`

 	// list of module-specific flags that will be used for C and C++ compiles when
 	// compiling with clang
 	Clang_cflags []string `android:"arch_variant"`

 	// list of module-specific flags that will be used for .S compiles when
 	// compiling with clang
 	Clang_asflags []string `android:"arch_variant"`

 	// list of module-specific flags that will be used for .y and .yy compiles
 	Yaccflags []string

 	// the instruction set architecture to use to compile the C/C++
 	// module.
 	Instruction_set string `android:"arch_variant"`

 	// list of directories relative to the root of the source tree that will
 	// be added to the include path using -I.
 	// If possible, don't use this.  If adding paths from the current directory use
 	// local_include_dirs, if adding paths from other modules use export_include_dirs in
 	// that module.
 	Include_dirs []string `android:"arch_variant"`

 	// list of directories relative to the Blueprints file that will
 	// be added to the include path using -I
 	Local_include_dirs []string `android:"arch_variant"`

 	// list of generated sources to compile. These are the names of gensrcs or
 	// genrule modules.
 	Generated_sources []string `android:"arch_variant"`

 	// list of generated headers to add to the include path. These are the names
 	// of genrule modules.
 	Generated_headers []string `android:"arch_variant"`

 	// pass -frtti instead of -fno-rtti
 	Rtti *bool

 	// if set to false, use -std=c++* instead of -std=gnu++*
 	Gnu_extensions *bool

 	Debug, Release struct {
 		// list of module-specific flags that will be used for C and C++ compiles in debug or
 		// release builds
 		Cflags []string `android:"arch_variant"`
 	} `android:"arch_variant"`
 }

 func NewBaseCompiler() *baseCompiler {
 	return &baseCompiler{}
 }

 type baseCompiler struct {
 	Properties BaseCompilerProperties
 	Proto      ProtoProperties
 	deps       android.Paths
 }

 var _ compiler = (*baseCompiler)(nil)

 func (compiler *baseCompiler) appendCflags(flags []string) {
 	compiler.Properties.Cflags = append(compiler.Properties.Cflags, flags...)
 }

 func (compiler *baseCompiler) appendAsflags(flags []string) {
 	compiler.Properties.Asflags = append(compiler.Properties.Asflags, flags...)
 }

 func (compiler *baseCompiler) compilerProps() []interface{} {
 	return []interface{}{&compiler.Properties}
 }

 func (compiler *baseCompiler) compilerInit(ctx BaseModuleContext) {}

 func (compiler *baseCompiler) compilerDeps(ctx BaseModuleContext, deps Deps) Deps {
 	deps.GeneratedSources = append(deps.GeneratedSources, compiler.Properties.Generated_sources...)
 	deps.GeneratedHeaders = append(deps.GeneratedHeaders, compiler.Properties.Generated_headers...)

 	if compiler.hasProto() {
 		deps = protoDeps(ctx, deps, &compiler.Proto)
 	}

 	return deps
 }

 // Create a Flags struct that collects the compile flags from global values,
 // per-target values, module type values, and per-module Blueprints properties
 func (compiler *baseCompiler) compilerFlags(ctx ModuleContext, flags Flags) Flags {
 	tc := ctx.toolchain()

 	CheckBadCompilerFlags(ctx, "cflags", compiler.Properties.Cflags)
 	CheckBadCompilerFlags(ctx, "cppflags", compiler.Properties.Cppflags)
 	CheckBadCompilerFlags(ctx, "conlyflags", compiler.Properties.Conlyflags)
 	CheckBadCompilerFlags(ctx, "asflags", compiler.Properties.Asflags)

 	esc := proptools.NinjaAndShellEscape

 	flags.CFlags = append(flags.CFlags, esc(compiler.Properties.Cflags)...)
 	flags.CppFlags = append(flags.CppFlags, esc(compiler.Properties.Cppflags)...)
 	flags.ConlyFlags = append(flags.ConlyFlags, esc(compiler.Properties.Conlyflags)...)
 	flags.AsFlags = append(flags.AsFlags, esc(compiler.Properties.Asflags)...)
 	flags.YaccFlags = append(flags.YaccFlags, esc(compiler.Properties.Yaccflags)...)

 	// Include dir cflags
 	rootIncludeDirs := android.PathsForSource(ctx, compiler.Properties.Include_dirs)
 	localIncludeDirs := android.PathsForModuleSrc(ctx, compiler.Properties.Local_include_dirs)
 	flags.GlobalFlags = append(flags.GlobalFlags,
 		includeDirsToFlags(localIncludeDirs),
 		includeDirsToFlags(rootIncludeDirs))

 	if !ctx.noDefaultCompilerFlags() {
 		if !ctx.sdk() || ctx.Host() {
 			flags.GlobalFlags = append(flags.GlobalFlags,
 				"${config.CommonGlobalIncludes}",
 				"${config.CommonGlobalSystemIncludes}",
 				tc.IncludeFlags(),
 				"${config.CommonNativehelperInclude}")
 		}

 		flags.GlobalFlags = append(flags.GlobalFlags, "-I"+android.PathForModuleSrc(ctx).String())
 	}

 	if ctx.sdk() {
 		// The NDK headers are installed to a common sysroot. While a more
 		// typical Soong approach would be to only make the headers for the
 		// library you're using available, we're trying to emulate the NDK
 		// behavior here, and the NDK always has all the NDK headers available.
 		flags.GlobalFlags = append(flags.GlobalFlags,
 			"-isystem "+getCurrentIncludePath(ctx).String(),
 			"-isystem "+getCurrentIncludePath(ctx).Join(ctx, tc.ClangTriple()).String())

 		// Traditionally this has come from android/api-level.h, but with the
 		// libc headers unified it must be set by the build system since we
 		// don't have per-API level copies of that header now.
 		flags.GlobalFlags = append(flags.GlobalFlags,
 			"-D__ANDROID_API__="+ctx.sdkVersion())

 		// Until the full NDK has been migrated to using ndk_headers, we still
 		// need to add the legacy sysroot includes to get the full set of
 		// headers.
 		legacyIncludes := fmt.Sprintf(
 			"prebuilts/ndk/current/platforms/android-%s/arch-%s/usr/include",
 			ctx.sdkVersion(), ctx.Arch().ArchType.String())
 		flags.GlobalFlags = append(flags.GlobalFlags, "-isystem "+legacyIncludes)
 	}

 	instructionSet := compiler.Properties.Instruction_set
 	if flags.RequiredInstructionSet != "" {
 		instructionSet = flags.RequiredInstructionSet
 	}
 	instructionSetFlags, err := tc.InstructionSetFlags(instructionSet)
 	if flags.Clang {
 		instructionSetFlags, err = tc.ClangInstructionSetFlags(instructionSet)
 	}
 	if err != nil {
 		ctx.ModuleErrorf("%s", err)
 	}

 	CheckBadCompilerFlags(ctx, "release.cflags", compiler.Properties.Release.Cflags)

 	// TODO: debug
 	flags.CFlags = append(flags.CFlags, esc(compiler.Properties.Release.Cflags)...)

 	if flags.Clang {
 		CheckBadCompilerFlags(ctx, "clang_cflags", compiler.Properties.Clang_cflags)
 		CheckBadCompilerFlags(ctx, "clang_asflags", compiler.Properties.Clang_asflags)

 		flags.CFlags = config.ClangFilterUnknownCflags(flags.CFlags)
 		flags.CFlags = append(flags.CFlags, esc(compiler.Properties.Clang_cflags)...)
 		flags.AsFlags = append(flags.AsFlags, esc(compiler.Properties.Clang_asflags)...)
 		flags.CppFlags = config.ClangFilterUnknownCflags(flags.CppFlags)
 		flags.ConlyFlags = config.ClangFilterUnknownCflags(flags.ConlyFlags)
 		flags.LdFlags = config.ClangFilterUnknownCflags(flags.LdFlags)

 		target := "-target " + tc.ClangTriple()
 		var gccPrefix string
 		if !ctx.Darwin() {
 			gccPrefix = "-B" + filepath.Join(tc.GccRoot(), tc.GccTriple(), "bin")
 		}

 		flags.CFlags = append(flags.CFlags, target, gccPrefix)
 		flags.AsFlags = append(flags.AsFlags, target, gccPrefix)
 		flags.LdFlags = append(flags.LdFlags, target, gccPrefix)
 	}

 	hod := "Host"
 	if ctx.Os().Class == android.Device {
 		hod = "Device"
 	}

 	if !ctx.noDefaultCompilerFlags() {
 		flags.GlobalFlags = append(flags.GlobalFlags, instructionSetFlags)
 		flags.ConlyFlags = append(flags.ConlyFlags, "${config.CommonGlobalConlyflags}")

 		if flags.Clang {
 			flags.AsFlags = append(flags.AsFlags, tc.ClangAsflags())
 			flags.CppFlags = append(flags.CppFlags, "${config.CommonClangGlobalCppflags}")
 			flags.GlobalFlags = append(flags.GlobalFlags,
 				tc.ClangCflags(),
 				"${config.CommonClangGlobalCflags}",
 				fmt.Sprintf("${config.%sClangGlobalCflags}", hod))
 		} else {
 			flags.CppFlags = append(flags.CppFlags, "${config.CommonGlobalCppflags}")
 			flags.GlobalFlags = append(flags.GlobalFlags,
 				tc.Cflags(),
 				"${config.CommonGlobalCflags}",
 				fmt.Sprintf("${config.%sGlobalCflags}", hod))
 		}

 		if Bool(ctx.AConfig().ProductVariables.Brillo) {
 			flags.GlobalFlags = append(flags.GlobalFlags, "-D__BRILLO__")
 		}

 		if ctx.Device() {
 			if Bool(compiler.Properties.Rtti) {
 				flags.CppFlags = append(flags.CppFlags, "-frtti")
 			} else {
 				flags.CppFlags = append(flags.CppFlags, "-fno-rtti")
 			}
 		}

 		flags.AsFlags = append(flags.AsFlags, "-D__ASSEMBLY__")

 		if flags.Clang {
 			flags.CppFlags = append(flags.CppFlags, tc.ClangCppflags())
 		} else {
 			flags.CppFlags = append(flags.CppFlags, tc.Cppflags())
 		}
 	}

 	if flags.Clang {
 		flags.GlobalFlags = append(flags.GlobalFlags, tc.ToolchainClangCflags())
 	} else {
 		flags.GlobalFlags = append(flags.GlobalFlags, tc.ToolchainCflags())
 	}

 	if !ctx.sdk() {
 		cStd := config.CStdVersion
 		cppStd := config.CppStdVersion

 		if !flags.Clang {
 			// GCC uses an invalid C++14 ABI (emits calls to
 			// __cxa_throw_bad_array_length, which is not a valid C++ RT ABI).
 			// http://b/25022512
 			cppStd = config.GccCppStdVersion
 		} else if ctx.Host() && !flags.Clang {
 			// The host GCC doesn't support C++14 (and is deprecated, so likely
 			// never will). Build these modules with C++11.
 			cppStd = config.GccCppStdVersion
 		}

 		if compiler.Properties.Gnu_extensions != nil && *compiler.Properties.Gnu_extensions == false {
 			cStd = gnuToCReplacer.Replace(cStd)
 			cppStd = gnuToCReplacer.Replace(cppStd)
 		}

 		flags.ConlyFlags = append([]string{"-std=" + cStd}, flags.ConlyFlags...)
 		flags.CppFlags = append([]string{"-std=" + cppStd}, flags.CppFlags...)
 	}

 	// We can enforce some rules more strictly in the code we own. strict
 	// indicates if this is code that we can be stricter with. If we have
 	// rules that we want to apply to *our* code (but maybe can't for
 	// vendor/device specific things), we could extend this to be a ternary
 	// value.
 	strict := true
 	if strings.HasPrefix(android.PathForModuleSrc(ctx).String(), "external/") {
 		strict = false
 	}

 	// Can be used to make some annotations stricter for code we can fix
 	// (such as when we mark functions as deprecated).
 	if strict {
 		flags.CFlags = append(flags.CFlags, "-DANDROID_STRICT")
 	}

 	if compiler.hasProto() {
 		flags = protoFlags(ctx, flags, &compiler.Proto)
 	}

 	return flags
 }

 func (compiler *baseCompiler) hasProto() bool {
 	for _, src := range compiler.Properties.Srcs {
 		if filepath.Ext(src) == ".proto" {
 			return true
 		}
 	}

 	return false
 }

 var gnuToCReplacer = strings.NewReplacer("gnu", "c")

 func ndkPathDeps(ctx ModuleContext) android.Paths {
 	if ctx.sdk() {
 		// The NDK sysroot timestamp file depends on all the NDK sysroot files
 		// (headers and libraries).
 		return android.Paths{getNdkSysrootTimestampFile(ctx)}
 	}
 	return nil
 }

 func (compiler *baseCompiler) compile(ctx ModuleContext, flags Flags, deps PathDeps) Objects {
 	pathDeps := deps.GeneratedHeaders
 	pathDeps = append(pathDeps, ndkPathDeps(ctx)...)

 	srcs := ctx.ExpandSources(compiler.Properties.Srcs, compiler.Properties.Exclude_srcs)
 	srcs = append(srcs, deps.GeneratedSources...)

 	buildFlags := flagsToBuilderFlags(flags)

 	srcs, genDeps := genSources(ctx, srcs, buildFlags)

 	pathDeps = append(pathDeps, genDeps...)
 	pathDeps = append(pathDeps, flags.CFlagsDeps...)

 	compiler.deps = pathDeps

 	// Compile files listed in c.Properties.Srcs into objects
 	objs := compileObjs(ctx, buildFlags, "", srcs, compiler.deps)

 	if ctx.Failed() {
 		return Objects{}
 	}

 	return objs
 }

 // Compile a list of source files into objects a specified subdirectory
 func compileObjs(ctx android.ModuleContext, flags builderFlags,
 	subdir string, srcFiles, deps android.Paths) Objects {

 	return TransformSourceToObj(ctx, subdir, srcFiles, flags, deps)
 }
	// 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"
	"path/filepath"
	"strings"

	"github.com/google/blueprint/proptools"

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

	// This file contains the basic C/C++/assembly to .o compliation steps

	type BaseCompilerProperties struct {
	// list of source files used to compile the C/C++ module. May be .c, .cpp, or .S files.
	Srcs []string `android:"arch_variant"`

	// list of source files that should not be used to build the C/C++ module.
	// This is most useful in the arch/multilib variants to remove non-common files
	Exclude_srcs []string `android:"arch_variant"`

	// list of module-specific flags that will be used for C and C++ compiles.
	Cflags []string `android:"arch_variant"`

	// list of module-specific flags that will be used for C++ compiles
	Cppflags []string `android:"arch_variant"`

	// list of module-specific flags that will be used for C compiles
	Conlyflags []string `android:"arch_variant"`

	// list of module-specific flags that will be used for .S compiles
	Asflags []string `android:"arch_variant"`

	// list of module-specific flags that will be used for C and C++ compiles when
	// compiling with clang
	Clang_cflags []string `android:"arch_variant"`

	// list of module-specific flags that will be used for .S compiles when
	// compiling with clang
	Clang_asflags []string `android:"arch_variant"`

	// list of module-specific flags that will be used for .y and .yy compiles
	Yaccflags []string

	// the instruction set architecture to use to compile the C/C++
	// module.
	Instruction_set string `android:"arch_variant"`

	// list of directories relative to the root of the source tree that will
	// be added to the include path using -I.
	// If possible, don't use this. If adding paths from the current directory use
	// local_include_dirs, if adding paths from other modules use export_include_dirs in
	// that module.
	Include_dirs []string `android:"arch_variant"`

	// list of directories relative to the Blueprints file that will
	// be added to the include path using -I
	Local_include_dirs []string `android:"arch_variant"`

	// list of generated sources to compile. These are the names of gensrcs or
	// genrule modules.
	Generated_sources []string `android:"arch_variant"`

	// list of generated headers to add to the include path. These are the names
	// of genrule modules.
	Generated_headers []string `android:"arch_variant"`

	// pass -frtti instead of -fno-rtti
	Rtti *bool

	// if set to false, use -std=c++* instead of -std=gnu++*
	Gnu_extensions *bool

	Debug, Release struct {
	// list of module-specific flags that will be used for C and C++ compiles in debug or
	// release builds
	Cflags []string `android:"arch_variant"`
	} `android:"arch_variant"`
	}

	func NewBaseCompiler() *baseCompiler {
	return &baseCompiler{}
	}

	type baseCompiler struct {
	Properties BaseCompilerProperties
	Proto ProtoProperties
	deps android.Paths
	}

	var _ compiler = (*baseCompiler)(nil)

	func (compiler *baseCompiler) appendCflags(flags []string) {
	compiler.Properties.Cflags = append(compiler.Properties.Cflags, flags...)
	}

	func (compiler *baseCompiler) appendAsflags(flags []string) {
	compiler.Properties.Asflags = append(compiler.Properties.Asflags, flags...)
	}

	func (compiler *baseCompiler) compilerProps() []interface{} {
	return []interface{}{&compiler.Properties}
	}

	func (compiler *baseCompiler) compilerInit(ctx BaseModuleContext) {}

	func (compiler *baseCompiler) compilerDeps(ctx BaseModuleContext, deps Deps) Deps {
	deps.GeneratedSources = append(deps.GeneratedSources, compiler.Properties.Generated_sources...)
	deps.GeneratedHeaders = append(deps.GeneratedHeaders, compiler.Properties.Generated_headers...)

	if compiler.hasProto() {
	deps = protoDeps(ctx, deps, &compiler.Proto)
	}

	return deps
	}

	// Create a Flags struct that collects the compile flags from global values,
	// per-target values, module type values, and per-module Blueprints properties
	func (compiler *baseCompiler) compilerFlags(ctx ModuleContext, flags Flags) Flags {
	tc := ctx.toolchain()

	CheckBadCompilerFlags(ctx, "cflags", compiler.Properties.Cflags)
	CheckBadCompilerFlags(ctx, "cppflags", compiler.Properties.Cppflags)
	CheckBadCompilerFlags(ctx, "conlyflags", compiler.Properties.Conlyflags)
	CheckBadCompilerFlags(ctx, "asflags", compiler.Properties.Asflags)

	esc := proptools.NinjaAndShellEscape

	flags.CFlags = append(flags.CFlags, esc(compiler.Properties.Cflags)...)
	flags.CppFlags = append(flags.CppFlags, esc(compiler.Properties.Cppflags)...)
	flags.ConlyFlags = append(flags.ConlyFlags, esc(compiler.Properties.Conlyflags)...)
	flags.AsFlags = append(flags.AsFlags, esc(compiler.Properties.Asflags)...)
	flags.YaccFlags = append(flags.YaccFlags, esc(compiler.Properties.Yaccflags)...)

	// Include dir cflags
	rootIncludeDirs := android.PathsForSource(ctx, compiler.Properties.Include_dirs)
	localIncludeDirs := android.PathsForModuleSrc(ctx, compiler.Properties.Local_include_dirs)
	flags.GlobalFlags = append(flags.GlobalFlags,
	includeDirsToFlags(localIncludeDirs),
	includeDirsToFlags(rootIncludeDirs))

	if !ctx.noDefaultCompilerFlags() {
	if !ctx.sdk() \|\| ctx.Host() {
	flags.GlobalFlags = append(flags.GlobalFlags,
	"${config.CommonGlobalIncludes}",
	"${config.CommonGlobalSystemIncludes}",
	tc.IncludeFlags(),
	"${config.CommonNativehelperInclude}")
	}

	flags.GlobalFlags = append(flags.GlobalFlags, "-I"+android.PathForModuleSrc(ctx).String())
	}

	if ctx.sdk() {
	// The NDK headers are installed to a common sysroot. While a more
	// typical Soong approach would be to only make the headers for the
	// library you're using available, we're trying to emulate the NDK
	// behavior here, and the NDK always has all the NDK headers available.
	flags.GlobalFlags = append(flags.GlobalFlags,
	"-isystem "+getCurrentIncludePath(ctx).String(),
	"-isystem "+getCurrentIncludePath(ctx).Join(ctx, tc.ClangTriple()).String())

	// Traditionally this has come from android/api-level.h, but with the
	// libc headers unified it must be set by the build system since we
	// don't have per-API level copies of that header now.
	flags.GlobalFlags = append(flags.GlobalFlags,
	"-D__ANDROID_API__="+ctx.sdkVersion())

	// Until the full NDK has been migrated to using ndk_headers, we still
	// need to add the legacy sysroot includes to get the full set of
	// headers.
	legacyIncludes := fmt.Sprintf(
	"prebuilts/ndk/current/platforms/android-%s/arch-%s/usr/include",
	ctx.sdkVersion(), ctx.Arch().ArchType.String())
	flags.GlobalFlags = append(flags.GlobalFlags, "-isystem "+legacyIncludes)
	}

	instructionSet := compiler.Properties.Instruction_set
	if flags.RequiredInstructionSet != "" {
	instructionSet = flags.RequiredInstructionSet
	}
	instructionSetFlags, err := tc.InstructionSetFlags(instructionSet)
	if flags.Clang {
	instructionSetFlags, err = tc.ClangInstructionSetFlags(instructionSet)
	}
	if err != nil {
	ctx.ModuleErrorf("%s", err)
	}

	CheckBadCompilerFlags(ctx, "release.cflags", compiler.Properties.Release.Cflags)

	// TODO: debug
	flags.CFlags = append(flags.CFlags, esc(compiler.Properties.Release.Cflags)...)

	if flags.Clang {
	CheckBadCompilerFlags(ctx, "clang_cflags", compiler.Properties.Clang_cflags)
	CheckBadCompilerFlags(ctx, "clang_asflags", compiler.Properties.Clang_asflags)

	flags.CFlags = config.ClangFilterUnknownCflags(flags.CFlags)
	flags.CFlags = append(flags.CFlags, esc(compiler.Properties.Clang_cflags)...)
	flags.AsFlags = append(flags.AsFlags, esc(compiler.Properties.Clang_asflags)...)
	flags.CppFlags = config.ClangFilterUnknownCflags(flags.CppFlags)
	flags.ConlyFlags = config.ClangFilterUnknownCflags(flags.ConlyFlags)
	flags.LdFlags = config.ClangFilterUnknownCflags(flags.LdFlags)

	target := "-target " + tc.ClangTriple()
	var gccPrefix string
	if !ctx.Darwin() {
	gccPrefix = "-B" + filepath.Join(tc.GccRoot(), tc.GccTriple(), "bin")
	}

	flags.CFlags = append(flags.CFlags, target, gccPrefix)
	flags.AsFlags = append(flags.AsFlags, target, gccPrefix)
	flags.LdFlags = append(flags.LdFlags, target, gccPrefix)
	}

	hod := "Host"
	if ctx.Os().Class == android.Device {
	hod = "Device"
	}

	if !ctx.noDefaultCompilerFlags() {
	flags.GlobalFlags = append(flags.GlobalFlags, instructionSetFlags)
	flags.ConlyFlags = append(flags.ConlyFlags, "${config.CommonGlobalConlyflags}")

	if flags.Clang {
	flags.AsFlags = append(flags.AsFlags, tc.ClangAsflags())
	flags.CppFlags = append(flags.CppFlags, "${config.CommonClangGlobalCppflags}")
	flags.GlobalFlags = append(flags.GlobalFlags,
	tc.ClangCflags(),
	"${config.CommonClangGlobalCflags}",
	fmt.Sprintf("${config.%sClangGlobalCflags}", hod))
	} else {
	flags.CppFlags = append(flags.CppFlags, "${config.CommonGlobalCppflags}")
	flags.GlobalFlags = append(flags.GlobalFlags,
	tc.Cflags(),
	"${config.CommonGlobalCflags}",
	fmt.Sprintf("${config.%sGlobalCflags}", hod))
	}

	if Bool(ctx.AConfig().ProductVariables.Brillo) {
	flags.GlobalFlags = append(flags.GlobalFlags, "-D__BRILLO__")
	}

	if ctx.Device() {
	if Bool(compiler.Properties.Rtti) {
	flags.CppFlags = append(flags.CppFlags, "-frtti")
	} else {
	flags.CppFlags = append(flags.CppFlags, "-fno-rtti")
	}
	}

	flags.AsFlags = append(flags.AsFlags, "-D__ASSEMBLY__")

	if flags.Clang {
	flags.CppFlags = append(flags.CppFlags, tc.ClangCppflags())
	} else {
	flags.CppFlags = append(flags.CppFlags, tc.Cppflags())
	}
	}

	if flags.Clang {
	flags.GlobalFlags = append(flags.GlobalFlags, tc.ToolchainClangCflags())
	} else {
	flags.GlobalFlags = append(flags.GlobalFlags, tc.ToolchainCflags())
	}

	if !ctx.sdk() {
	cStd := config.CStdVersion
	cppStd := config.CppStdVersion

	if !flags.Clang {
	// GCC uses an invalid C++14 ABI (emits calls to
	// __cxa_throw_bad_array_length, which is not a valid C++ RT ABI).
	// http://b/25022512
	cppStd = config.GccCppStdVersion
	} else if ctx.Host() && !flags.Clang {
	// The host GCC doesn't support C++14 (and is deprecated, so likely
	// never will). Build these modules with C++11.
	cppStd = config.GccCppStdVersion
	}

	if compiler.Properties.Gnu_extensions != nil && *compiler.Properties.Gnu_extensions == false {
	cStd = gnuToCReplacer.Replace(cStd)
	cppStd = gnuToCReplacer.Replace(cppStd)
	}

	flags.ConlyFlags = append([]string{"-std=" + cStd}, flags.ConlyFlags...)
	flags.CppFlags = append([]string{"-std=" + cppStd}, flags.CppFlags...)
	}

	// We can enforce some rules more strictly in the code we own. strict
	// indicates if this is code that we can be stricter with. If we have
	// rules that we want to apply to our code (but maybe can't for
	// vendor/device specific things), we could extend this to be a ternary
	// value.
	strict := true
	if strings.HasPrefix(android.PathForModuleSrc(ctx).String(), "external/") {
	strict = false
	}

	// Can be used to make some annotations stricter for code we can fix
	// (such as when we mark functions as deprecated).
	if strict {
	flags.CFlags = append(flags.CFlags, "-DANDROID_STRICT")
	}

	if compiler.hasProto() {
	flags = protoFlags(ctx, flags, &compiler.Proto)
	}

	return flags
	}

	func (compiler *baseCompiler) hasProto() bool {
	for _, src := range compiler.Properties.Srcs {
	if filepath.Ext(src) == ".proto" {
	return true
	}
	}

	return false
	}

	var gnuToCReplacer = strings.NewReplacer("gnu", "c")

	func ndkPathDeps(ctx ModuleContext) android.Paths {
	if ctx.sdk() {
	// The NDK sysroot timestamp file depends on all the NDK sysroot files
	// (headers and libraries).
	return android.Paths{getNdkSysrootTimestampFile(ctx)}
	}
	return nil
	}

	func (compiler *baseCompiler) compile(ctx ModuleContext, flags Flags, deps PathDeps) Objects {
	pathDeps := deps.GeneratedHeaders
	pathDeps = append(pathDeps, ndkPathDeps(ctx)...)

	srcs := ctx.ExpandSources(compiler.Properties.Srcs, compiler.Properties.Exclude_srcs)
	srcs = append(srcs, deps.GeneratedSources...)

	buildFlags := flagsToBuilderFlags(flags)

	srcs, genDeps := genSources(ctx, srcs, buildFlags)

	pathDeps = append(pathDeps, genDeps...)
	pathDeps = append(pathDeps, flags.CFlagsDeps...)

	compiler.deps = pathDeps

	// Compile files listed in c.Properties.Srcs into objects
	objs := compileObjs(ctx, buildFlags, "", srcs, compiler.deps)

	if ctx.Failed() {
	return Objects{}
	}

	return objs
	}

	// Compile a list of source files into objects a specified subdirectory
	func compileObjs(ctx android.ModuleContext, flags builderFlags,
	subdir string, srcFiles, deps android.Paths) Objects {

	return TransformSourceToObj(ctx, subdir, srcFiles, flags, deps)
	}