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

cmd/soong_build/main.go

@@ -0,0 +1,68 @@
+// 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 main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"blueprint"
+	"blueprint/bootstrap"
+
+	"android/soong/cc"
+	"android/soong/common"
+	"android/soong/config"
+)
+
+func main() {
+	flag.Parse()
+
+	// The top-level Blueprints file is passed as the first argument.
+	srcDir := filepath.Dir(flag.Arg(0))
+
+	ctx := blueprint.NewContext()
+
+	// Module types
+	ctx.RegisterModuleType("cc_library_static", cc.NewCCLibraryStatic)
+	ctx.RegisterModuleType("cc_library_shared", cc.NewCCLibraryShared)
+	ctx.RegisterModuleType("cc_library", cc.NewCCLibrary)
+	ctx.RegisterModuleType("cc_object", cc.NewCCObject)
+	ctx.RegisterModuleType("cc_binary", cc.NewCCBinary)
+
+	ctx.RegisterModuleType("toolchain_library", cc.NewToolchainLibrary)
+
+	ctx.RegisterModuleType("cc_library_host_static", cc.NewCCLibraryHostStatic)
+	ctx.RegisterModuleType("cc_library_host_shared", cc.NewCCLibraryHostShared)
+	ctx.RegisterModuleType("cc_binary_host", cc.NewCCBinaryHost)
+
+	// Mutators
+	ctx.RegisterEarlyMutator("arch", common.ArchMutator)
+	ctx.RegisterEarlyMutator("link", cc.LinkageMutator)
+
+	// Singletons
+
+	configuration, err := config.New(srcDir)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "%s", err)
+		os.Exit(1)
+	}
+
+	// Temporary hack
+	//ctx.SetIgnoreUnknownModuleTypes(true)
+
+	bootstrap.Main(ctx, configuration, config.ConfigFileName)
+}