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/config/config.go b/config/config.go
new file mode 100644
index 0000000..6cdc211
--- /dev/null
+++ b/config/config.go
@@ -0,0 +1,152 @@
+// 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 config
+
+import (
+ "android/soong/common"
+ "encoding/json"
+ "fmt"
+ "os"
+ "runtime"
+)
+
+var _ common.Config = (*Config)(nil)
+
+// The configuration file name
+const ConfigFileName = "soong.config"
+
+// A FileConfigurableOptions contains options which can be configured by the
+// config file. These will be included in the config struct.
+type FileConfigurableOptions struct {
+}
+
+func NewFileConfigurableOptions() FileConfigurableOptions {
+ f := FileConfigurableOptions{}
+ return f
+}
+
+// A Config object represents the entire build configuration for Blue.
+type Config struct {
+ FileConfigurableOptions
+
+ srcDir string // the path of the root source directory
+}
+
+// loads configuration options from a JSON file in the cwd.
+func loadFromConfigFile(config *Config) error {
+ // Make a proxy config
+ var configProxy FileConfigurableOptions
+
+ // Try to open the file
+ configFileReader, err := os.Open(ConfigFileName)
+ defer configFileReader.Close()
+ if os.IsNotExist(err) {
+ // Need to create a file, so that blueprint & ninja don't get in
+ // a dependency tracking loop.
+ // Make a file-configurable-options with defaults, write it out using
+ // a json writer.
+ configProxy = NewFileConfigurableOptions()
+ err = saveToConfigFile(configProxy)
+ if err != nil {
+ return err
+ }
+ } else {
+ // Make a decoder for it
+ jsonDecoder := json.NewDecoder(configFileReader)
+ err = jsonDecoder.Decode(&configProxy)
+ if err != nil {
+ return fmt.Errorf("config file: %s did not parse correctly: "+err.Error(), ConfigFileName)
+ }
+ }
+
+ // Copy the configurable options out of the config_proxy into the config,
+ // and we're done!
+ config.FileConfigurableOptions = configProxy
+
+ // No error
+ return nil
+}
+
+func saveToConfigFile(config FileConfigurableOptions) error {
+ data, err := json.MarshalIndent(&config, "", " ")
+ if err != nil {
+ return fmt.Errorf("cannot marshal config data: %s", err.Error())
+ }
+
+ configFileWriter, err := os.Create(ConfigFileName)
+ if err != nil {
+ return fmt.Errorf("cannot create empty config file %s: %s\n", ConfigFileName, err.Error())
+ }
+ defer configFileWriter.Close()
+
+ _, err = configFileWriter.Write(data)
+ if err != nil {
+ return fmt.Errorf("default config file: %s could not be written: %s", ConfigFileName, err.Error())
+ }
+
+ return nil
+}
+
+// New creates a new Config object. The srcDir argument specifies the path to
+// the root source directory. It also loads the config file, if found.
+func New(srcDir string) (*Config, error) {
+ // Make a config with default options
+ config := &Config{srcDir: srcDir}
+
+ // Load any configurable options from the configuration file
+ err := loadFromConfigFile(config)
+ if err != nil {
+ return nil, err
+ }
+
+ return config, nil
+}
+
+func (c *Config) SrcDir() string {
+ return c.srcDir
+}
+
+// HostGoOS returns the OS of the system that the Go toolchain is being run on.
+func (c *Config) HostGoOS() string {
+ return runtime.GOOS
+}
+
+// PrebuiltOS returns the name of the host OS used in prebuilts directories
+func (c *Config) PrebuiltOS() string {
+ switch runtime.GOOS {
+ case "linux":
+ return "linux-x86"
+ case "darwin":
+ return "darwin-x86"
+ default:
+ panic("Unknown GOOS")
+ }
+}
+
+// GoRoot returns the path to the root directory of the Go toolchain.
+func (c *Config) GoRoot() string {
+ return fmt.Sprintf("%s/prebuilts/go/%s", c.srcDir, c.PrebuiltOS())
+}
+
+func (c *Config) CpPreserveSymlinksFlags() string {
+ switch c.HostGoOS() {
+ case "darwin":
+ return "-R"
+ case "linux":
+ return "-d"
+ default:
+ return ""
+ }
+}