--- /dev/null
+// Copyright 2013 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.
+
+// Except for this comment, this file is a verbatim copy of the file
+// with the same name in $GOROOT/src/go/internal/gccgoimporter.
+
+package gccgoimporter
+
+import (
+ "bufio"
+ "go/types"
+ exec "golang.org/x/sys/execabs"
+ "os"
+ "path/filepath"
+ "strings"
+)
+
+// Information about a specific installation of gccgo.
+type GccgoInstallation struct {
+ // Version of gcc (e.g. 4.8.0).
+ GccVersion string
+
+ // Target triple (e.g. x86_64-unknown-linux-gnu).
+ TargetTriple string
+
+ // Built-in library paths used by this installation.
+ LibPaths []string
+}
+
+// Ask the driver at the given path for information for this GccgoInstallation.
+// The given arguments are passed directly to the call of the driver.
+func (inst *GccgoInstallation) InitFromDriver(gccgoPath string, args ...string) (err error) {
+ argv := append([]string{"-###", "-S", "-x", "go", "-"}, args...)
+ cmd := exec.Command(gccgoPath, argv...)
+ stderr, err := cmd.StderrPipe()
+ if err != nil {
+ return
+ }
+
+ err = cmd.Start()
+ if err != nil {
+ return
+ }
+
+ scanner := bufio.NewScanner(stderr)
+ for scanner.Scan() {
+ line := scanner.Text()
+ switch {
+ case strings.HasPrefix(line, "Target: "):
+ inst.TargetTriple = line[8:]
+
+ case line[0] == ' ':
+ args := strings.Fields(line)
+ for _, arg := range args[1:] {
+ if strings.HasPrefix(arg, "-L") {
+ inst.LibPaths = append(inst.LibPaths, arg[2:])
+ }
+ }
+ }
+ }
+
+ argv = append([]string{"-dumpversion"}, args...)
+ stdout, err := exec.Command(gccgoPath, argv...).Output()
+ if err != nil {
+ return
+ }
+ inst.GccVersion = strings.TrimSpace(string(stdout))
+
+ return
+}
+
+// Return the list of export search paths for this GccgoInstallation.
+func (inst *GccgoInstallation) SearchPaths() (paths []string) {
+ for _, lpath := range inst.LibPaths {
+ spath := filepath.Join(lpath, "go", inst.GccVersion)
+ fi, err := os.Stat(spath)
+ if err != nil || !fi.IsDir() {
+ continue
+ }
+ paths = append(paths, spath)
+
+ spath = filepath.Join(spath, inst.TargetTriple)
+ fi, err = os.Stat(spath)
+ if err != nil || !fi.IsDir() {
+ continue
+ }
+ paths = append(paths, spath)
+ }
+
+ paths = append(paths, inst.LibPaths...)
+
+ return
+}
+
+// Return an importer that searches incpaths followed by the gcc installation's
+// built-in search paths and the current directory.
+func (inst *GccgoInstallation) GetImporter(incpaths []string, initmap map[*types.Package]InitData) Importer {
+ return GetImporter(append(append(incpaths, inst.SearchPaths()...), "."), initmap)
+}