| // Copyright 2015 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package main |
| |
| import ( |
| "errors" |
| "fmt" |
| "go/build" |
| "io" |
| "io/ioutil" |
| "os" |
| "os/exec" |
| "path" |
| "path/filepath" |
| ) |
| |
| // ctx, pkg, tmpdir in build.go |
| |
| var cmdBind = &command{ |
| run: runBind, |
| Name: "bind", |
| Usage: "[-target android|ios] [-bootclasspath <path>] [-classpath <path>] [-o output] [build flags] [package]", |
| Short: "build a library for Android and iOS", |
| Long: ` |
| Bind generates language bindings for the package named by the import |
| path, and compiles a library for the named target system. |
| |
| The -target flag takes a target system name, either android (the |
| default) or ios. |
| |
| For -target android, the bind command produces an AAR (Android ARchive) |
| file that archives the precompiled Java API stub classes, the compiled |
| shared libraries, and all asset files in the /assets subdirectory under |
| the package directory. The output is named '<package_name>.aar' by |
| default. This AAR file is commonly used for binary distribution of an |
| Android library project and most Android IDEs support AAR import. For |
| example, in Android Studio (1.2+), an AAR file can be imported using |
| the module import wizard (File > New > New Module > Import .JAR or |
| .AAR package), and setting it as a new dependency |
| (File > Project Structure > Dependencies). This requires 'javac' |
| (version 1.7+) and Android SDK (API level 15 or newer) to build the |
| library for Android. The environment variable ANDROID_HOME must be set |
| to the path to Android SDK. Use the -javapkg flag to specify the Java |
| package prefix for the generated classes. |
| |
| By default, -target=android builds shared libraries for all supported |
| instruction sets (arm, arm64, 386, amd64). A subset of instruction sets |
| can be selected by specifying target type with the architecture name. E.g., |
| -target=android/arm,android/386. |
| |
| For -target ios, gomobile must be run on an OS X machine with Xcode |
| installed. The generated Objective-C types can be prefixed with the -prefix |
| flag. |
| |
| For -target android, the -bootclasspath and -classpath flags are used to |
| control the bootstrap classpath and the classpath for Go wrappers to Java |
| classes. |
| |
| The -v flag provides verbose output, including the list of packages built. |
| |
| The build flags -a, -n, -x, -gcflags, -ldflags, -tags, and -work |
| are shared with the build command. For documentation, see 'go help build'. |
| `, |
| } |
| |
| func runBind(cmd *command) error { |
| cleanup, err := buildEnvInit() |
| if err != nil { |
| return err |
| } |
| defer cleanup() |
| |
| args := cmd.flag.Args() |
| |
| targetOS, targetArchs, err := parseBuildTarget(buildTarget) |
| if err != nil { |
| return fmt.Errorf(`invalid -target=%q: %v`, buildTarget, err) |
| } |
| |
| oldCtx := ctx |
| defer func() { |
| ctx = oldCtx |
| }() |
| ctx.GOARCH = "arm" |
| ctx.GOOS = targetOS |
| |
| if bindJavaPkg != "" && ctx.GOOS != "android" { |
| return fmt.Errorf("-javapkg is supported only for android target") |
| } |
| if bindPrefix != "" && ctx.GOOS != "darwin" { |
| return fmt.Errorf("-prefix is supported only for ios target") |
| } |
| |
| if ctx.GOOS == "android" { |
| if _, err := ndkRoot(); err != nil { |
| return err |
| } |
| } |
| |
| if ctx.GOOS == "darwin" { |
| ctx.BuildTags = append(ctx.BuildTags, "ios") |
| } |
| |
| var gobind string |
| if !buildN { |
| gobind, err = exec.LookPath("gobind") |
| if err != nil { |
| return errors.New("gobind was not found. Please run gomobile init before trying again.") |
| } |
| } else { |
| gobind = "gobind" |
| } |
| |
| var pkgs []*build.Package |
| switch len(args) { |
| case 0: |
| pkgs = make([]*build.Package, 1) |
| pkgs[0], err = ctx.ImportDir(cwd, build.ImportComment) |
| default: |
| pkgs, err = importPackages(args) |
| } |
| if err != nil { |
| return err |
| } |
| |
| // check if any of the package is main |
| for _, pkg := range pkgs { |
| if pkg.Name == "main" { |
| return fmt.Errorf("binding 'main' package (%s) is not supported", pkg.ImportComment) |
| } |
| } |
| |
| switch targetOS { |
| case "android": |
| return goAndroidBind(gobind, pkgs, targetArchs) |
| case "darwin": |
| if !xcodeAvailable() { |
| return fmt.Errorf("-target=ios requires XCode") |
| } |
| return goIOSBind(gobind, pkgs, targetArchs) |
| default: |
| return fmt.Errorf(`invalid -target=%q`, buildTarget) |
| } |
| } |
| |
| func importPackages(args []string) ([]*build.Package, error) { |
| pkgs := make([]*build.Package, len(args)) |
| for i, a := range args { |
| a = path.Clean(a) |
| var err error |
| if pkgs[i], err = ctx.Import(a, cwd, build.ImportComment); err != nil { |
| return nil, fmt.Errorf("package %q: %v", a, err) |
| } |
| } |
| return pkgs, nil |
| } |
| |
| var ( |
| bindPrefix string // -prefix |
| bindJavaPkg string // -javapkg |
| bindClasspath string // -classpath |
| bindBootClasspath string // -bootclasspath |
| ) |
| |
| func init() { |
| // bind command specific commands. |
| cmdBind.flag.StringVar(&bindJavaPkg, "javapkg", "", |
| "specifies custom Java package path prefix. Valid only with -target=android.") |
| cmdBind.flag.StringVar(&bindPrefix, "prefix", "", |
| "custom Objective-C name prefix. Valid only with -target=ios.") |
| cmdBind.flag.StringVar(&bindClasspath, "classpath", "", "The classpath for imported Java classes. Valid only with -target=android.") |
| cmdBind.flag.StringVar(&bindBootClasspath, "bootclasspath", "", "The bootstrap classpath for imported Java classes. Valid only with -target=android.") |
| } |
| |
| func bootClasspath() (string, error) { |
| if bindBootClasspath != "" { |
| return bindBootClasspath, nil |
| } |
| apiPath, err := androidAPIPath() |
| if err != nil { |
| return "", err |
| } |
| return filepath.Join(apiPath, "android.jar"), nil |
| } |
| |
| func copyFile(dst, src string) error { |
| if buildX { |
| printcmd("cp %s %s", src, dst) |
| } |
| return writeFile(dst, func(w io.Writer) error { |
| if buildN { |
| return nil |
| } |
| f, err := os.Open(src) |
| if err != nil { |
| return err |
| } |
| defer f.Close() |
| |
| if _, err := io.Copy(w, f); err != nil { |
| return fmt.Errorf("cp %s %s failed: %v", src, dst, err) |
| } |
| return nil |
| }) |
| } |
| |
| func writeFile(filename string, generate func(io.Writer) error) error { |
| if buildV { |
| fmt.Fprintf(os.Stderr, "write %s\n", filename) |
| } |
| |
| err := mkdir(filepath.Dir(filename)) |
| if err != nil { |
| return err |
| } |
| |
| if buildN { |
| return generate(ioutil.Discard) |
| } |
| |
| f, err := os.Create(filename) |
| if err != nil { |
| return err |
| } |
| defer func() { |
| if cerr := f.Close(); err == nil { |
| err = cerr |
| } |
| }() |
| |
| return generate(f) |
| } |