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

cc/toolchain.go

@@ -0,0 +1,62 @@
+// Copyright 2015 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 (
+	"android/soong/common"
+)
+
+type toolchainFactory func(archVariant string, cpuVariant string) toolchain
+
+var toolchainFactories = map[common.HostOrDevice]map[common.ArchType]toolchainFactory{
+	common.Host:   make(map[common.ArchType]toolchainFactory),
+	common.Device: make(map[common.ArchType]toolchainFactory),
+}
+
+func registerToolchainFactory(hod common.HostOrDevice, arch common.ArchType,
+	factory toolchainFactory) {
+
+	toolchainFactories[hod][arch] = factory
+}
+
+type toolchain interface {
+	GccRoot() string
+	GccTriple() string
+	Cflags() string
+	Cppflags() string
+	Ldflags() string
+	IncludeFlags() string
+
+	ClangTriple() string
+	ClangCflags() string
+	ClangCppflags() string
+	ClangLdflags() string
+
+	Is64Bit() bool
+}
+
+type toolchain64Bit struct {
+}
+
+func (toolchain64Bit) Is64Bit() bool {
+	return true
+}
+
+type toolchain32Bit struct {
+}
+
+func (toolchain32Bit) Is64Bit() bool {
+	return false
+}