Add soong_build primary builder

Initial build logic for building android with soong.  It can build
a variety of C and C++ files for arm/arm64 and host.

Change-Id: I10eb37c2c2a50be6af1bb5fd568c0962b9476bf0
diff --git a/cc/x86_linux_host.go b/cc/x86_linux_host.go
new file mode 100644
index 0000000..1097883
--- /dev/null
+++ b/cc/x86_linux_host.go
@@ -0,0 +1,231 @@
+package cc
+
+import (
+	"runtime"
+	"strings"
+
+	"android/soong/common"
+)
+
+var (
+	linuxCflags = []string{
+		"-fno-exceptions", // from build/core/combo/select.mk
+		"-Wno-multichar",  // from build/core/combo/select.mk
+
+		"-Wa,--noexecstack",
+
+		"-fPIC",
+		"-no-canonical-prefixes",
+		"-include ${SrcDir}/build/core/combo/include/arch/linux-x86/AndroidConfig.h",
+
+		// Disable new longjmp in glibc 2.11 and later. See bug 2967937. Same for 2.15?
+		"-U_FORTIFY_SOURCE",
+		"-D_FORTIFY_SOURCE=0",
+
+		// Workaround differences in inttypes.h between host and target.
+		//See bug 12708004.
+		"-D__STDC_FORMAT_MACROS",
+		"-D__STDC_CONSTANT_MACROS",
+
+		// HOST_RELEASE_CFLAGS
+		"-O2", // from build/core/combo/select.mk
+		"-g",  // from build/core/combo/select.mk
+		"-fno-strict-aliasing", // from build/core/combo/select.mk
+	}
+
+	linuxLdflags = []string{
+		"-Wl,-z,noexecstack",
+		"-Wl,-z,relro",
+		"-Wl,-z,now",
+		"-Wl,--build-id=md5",
+		"-Wl,--warn-shared-textrel",
+		"-Wl,--fatal-warnings",
+		"-Wl,-icf=safe",
+		"-Wl,--hash-style=gnu",
+
+		// Disable transitive dependency library symbol resolving.
+		"-Wl,--allow-shlib-undefined",
+	}
+
+	// Extended cflags
+	linuxX86Cflags = []string{
+		"-msse3",
+		"-mfpmath=sse",
+		"-m32",
+		"-march=prescott",
+	}
+
+	linuxX8664Cflags = []string{
+		"-m64",
+	}
+
+	linuxX86Ldflags = []string{
+		"-m32",
+	}
+
+	linuxX8664Ldflags = []string{
+		"-m64",
+	}
+
+	linuxClangCflags = append([]string{
+		"--gcc-toolchain=${linuxGccRoot}",
+		"--sysroot=${linuxGccRoot}/sysroot",
+	}, clangFilterUnknownCflags(linuxCflags)...)
+
+	linuxClangLdflags = append([]string{
+		"--gcc-toolchain=${linuxGccRoot}",
+		"--sysroot=${linuxGccRoot}/sysroot",
+	}, clangFilterUnknownCflags(linuxLdflags)...)
+
+	linuxX86ClangLdflags = append([]string{
+		"-B${linuxGccRoot}/lib/gcc/${linuxGccTriple}/${linuxGccVersion}/32",
+		"-L${linuxGccRoot}/lib/gcc/${linuxGccTriple}/${linuxGccVersion}/32",
+		"-L${linuxGccRoot}/${linuxGccTriple}/lib32",
+	}, clangFilterUnknownCflags(linuxX86Ldflags)...)
+
+	linuxX8664ClangLdflags = append([]string{
+		"-B${linuxGccRoot}/lib/gcc/${linuxGccTriple}/${linuxGccVersion}",
+		"-L${linuxGccRoot}/lib/gcc/${linuxGccTriple}/${linuxGccVersion}",
+		"-L${linuxGccRoot}/${linuxGccTriple}/lib64",
+	}, clangFilterUnknownCflags(linuxX8664Ldflags)...)
+
+	linuxClangCppflags = []string{
+		"-isystem ${linuxGccRoot}/${linuxGccTriple}/include/c++/${linuxGccVersion}",
+		"-isystem ${linuxGccRoot}/${linuxGccTriple}/include/c++/${linuxGccVersion}/backward",
+	}
+
+	linuxX86ClangCppflags = []string{
+		"-isystem ${linuxGccRoot}/${linuxGccTriple}/include/c++/${linuxGccVersion}/${linuxGccTriple}/32",
+	}
+
+	linuxX8664ClangCppflags = []string{
+		"-isystem ${linuxGccRoot}/${linuxGccTriple}/include/c++/${linuxGccVersion}/${linuxGccTriple}",
+	}
+)
+
+func init() {
+	pctx.StaticVariable("linuxGccVersion", "4.8")
+
+	pctx.StaticVariable("linuxGccRoot",
+		"${SrcDir}/prebuilts/gcc/${HostPrebuiltTag}/host/x86_64-linux-glibc2.15-${linuxGccVersion}")
+
+	pctx.StaticVariable("linuxGccTriple", "x86_64-linux")
+
+	pctx.StaticVariable("linuxCflags", strings.Join(linuxCflags, " "))
+	pctx.StaticVariable("linuxLdflags", strings.Join(linuxLdflags, " "))
+
+	pctx.StaticVariable("linuxClangCflags", strings.Join(linuxClangCflags, " "))
+	pctx.StaticVariable("linuxClangLdflags", strings.Join(linuxClangLdflags, " "))
+	pctx.StaticVariable("linuxClangCppflags", strings.Join(linuxClangCppflags, " "))
+
+	// Extended cflags
+	pctx.StaticVariable("linuxX86Cflags", strings.Join(linuxX86Cflags, " "))
+	pctx.StaticVariable("linuxX8664Cflags", strings.Join(linuxX8664Cflags, " "))
+	pctx.StaticVariable("linuxX86Ldflags", strings.Join(linuxX86Ldflags, " "))
+	pctx.StaticVariable("linuxX8664Ldflags", strings.Join(linuxX8664Ldflags, " "))
+
+	pctx.StaticVariable("linuxX86ClangCflags",
+		strings.Join(clangFilterUnknownCflags(linuxX86Cflags), " "))
+	pctx.StaticVariable("linuxX8664ClangCflags",
+		strings.Join(clangFilterUnknownCflags(linuxX8664Cflags), " "))
+	pctx.StaticVariable("linuxX86ClangLdflags", strings.Join(linuxX86ClangLdflags, " "))
+	pctx.StaticVariable("linuxX8664ClangLdflags", strings.Join(linuxX8664ClangLdflags, " "))
+	pctx.StaticVariable("linuxX86ClangCppflags", strings.Join(linuxX86ClangCppflags, " "))
+	pctx.StaticVariable("linuxX8664ClangCppflags", strings.Join(linuxX8664ClangCppflags, " "))
+}
+
+type toolchainLinux struct {
+	cFlags, ldFlags string
+}
+
+type toolchainLinuxX86 struct {
+	toolchain32Bit
+	toolchainLinux
+}
+
+type toolchainLinuxX8664 struct {
+	toolchain64Bit
+	toolchainLinux
+}
+
+func (t *toolchainLinux) GccRoot() string {
+	return "${linuxGccRoot}"
+}
+
+func (t *toolchainLinux) GccTriple() string {
+	return "${linuxGccTriple}"
+}
+
+func (t *toolchainLinuxX86) Cflags() string {
+	return "${linuxCflags} ${linuxX86Cflags}"
+}
+
+func (t *toolchainLinuxX8664) Cflags() string {
+	return "${linuxCflags} ${linuxX8664Cflags}"
+}
+
+func (t *toolchainLinux) Cppflags() string {
+	return ""
+}
+
+func (t *toolchainLinuxX86) Ldflags() string {
+	return "${linuxLdflags} ${linuxX86Ldflags}"
+}
+
+func (t *toolchainLinuxX8664) Ldflags() string {
+	return "${linuxLdflags} ${linuxX8664Ldflags}"
+}
+
+func (t *toolchainLinux) IncludeFlags() string {
+	return ""
+}
+
+func (t *toolchainLinuxX86) ClangTriple() string {
+	return "i686-linux-gnu"
+}
+
+func (t *toolchainLinuxX86) ClangCflags() string {
+	return "${linuxClangCflags} ${linuxX86ClangCflags}"
+}
+
+func (t *toolchainLinuxX86) ClangCppflags() string {
+	return "${linuxClangCppflags} ${linuxX86ClangCppflags}"
+}
+
+func (t *toolchainLinuxX8664) ClangTriple() string {
+	return "x86_64-linux-gnu"
+}
+
+func (t *toolchainLinuxX8664) ClangCflags() string {
+	return "${linuxClangCflags} ${linuxX8664ClangCflags}"
+}
+
+func (t *toolchainLinuxX8664) ClangCppflags() string {
+	return "${linuxClangCppflags} ${linuxX8664ClangCppflags}"
+}
+
+func (t *toolchainLinuxX86) ClangLdflags() string {
+	return "${linuxClangLdflags} ${linuxX86ClangLdflags}"
+}
+
+func (t *toolchainLinuxX8664) ClangLdflags() string {
+	return "${linuxClangLdflags} ${linuxX8664ClangLdflags}"
+}
+
+var toolchainLinuxX86Singleton toolchain = &toolchainLinuxX86{}
+var toolchainLinuxX8664Singleton toolchain = &toolchainLinuxX8664{}
+
+func linuxX86ToolchainFactory(archVariant string, cpuVariant string) toolchain {
+	return toolchainLinuxX86Singleton
+}
+
+func linuxX8664ToolchainFactory(archVariant string, cpuVariant string) toolchain {
+	return toolchainLinuxX8664Singleton
+}
+
+func init() {
+	if runtime.GOOS == "linux" {
+		registerToolchainFactory(common.Host, common.X86, linuxX86ToolchainFactory)
+		registerToolchainFactory(common.Host, common.X86_64, linuxX8664ToolchainFactory)
+	}
+}