Source file src/pkg/go/internal/gccgoimporter/gccgoinstallation.go

     1	// Copyright 2013 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	package gccgoimporter
     6	
     7	import (
     8		"bufio"
     9		"go/types"
    10		"os"
    11		"os/exec"
    12		"path/filepath"
    13		"strings"
    14	)
    15	
    16	// Information about a specific installation of gccgo.
    17	type GccgoInstallation struct {
    18		// Version of gcc (e.g. 4.8.0).
    19		GccVersion string
    20	
    21		// Target triple (e.g. x86_64-unknown-linux-gnu).
    22		TargetTriple string
    23	
    24		// Built-in library paths used by this installation.
    25		LibPaths []string
    26	}
    27	
    28	// Ask the driver at the given path for information for this GccgoInstallation.
    29	// The given arguments are passed directly to the call of the driver.
    30	func (inst *GccgoInstallation) InitFromDriver(gccgoPath string, args ...string) (err error) {
    31		argv := append([]string{"-###", "-S", "-x", "go", "-"}, args...)
    32		cmd := exec.Command(gccgoPath, argv...)
    33		stderr, err := cmd.StderrPipe()
    34		if err != nil {
    35			return
    36		}
    37	
    38		err = cmd.Start()
    39		if err != nil {
    40			return
    41		}
    42	
    43		scanner := bufio.NewScanner(stderr)
    44		for scanner.Scan() {
    45			line := scanner.Text()
    46			switch {
    47			case strings.HasPrefix(line, "Target: "):
    48				inst.TargetTriple = line[8:]
    49	
    50			case line[0] == ' ':
    51				args := strings.Fields(line)
    52				for _, arg := range args[1:] {
    53					if strings.HasPrefix(arg, "-L") {
    54						inst.LibPaths = append(inst.LibPaths, arg[2:])
    55					}
    56				}
    57			}
    58		}
    59	
    60		argv = append([]string{"-dumpversion"}, args...)
    61		stdout, err := exec.Command(gccgoPath, argv...).Output()
    62		if err != nil {
    63			return
    64		}
    65		inst.GccVersion = strings.TrimSpace(string(stdout))
    66	
    67		return
    68	}
    69	
    70	// Return the list of export search paths for this GccgoInstallation.
    71	func (inst *GccgoInstallation) SearchPaths() (paths []string) {
    72		for _, lpath := range inst.LibPaths {
    73			spath := filepath.Join(lpath, "go", inst.GccVersion)
    74			fi, err := os.Stat(spath)
    75			if err != nil || !fi.IsDir() {
    76				continue
    77			}
    78			paths = append(paths, spath)
    79	
    80			spath = filepath.Join(spath, inst.TargetTriple)
    81			fi, err = os.Stat(spath)
    82			if err != nil || !fi.IsDir() {
    83				continue
    84			}
    85			paths = append(paths, spath)
    86		}
    87	
    88		paths = append(paths, inst.LibPaths...)
    89	
    90		return
    91	}
    92	
    93	// Return an importer that searches incpaths followed by the gcc installation's
    94	// built-in search paths and the current directory.
    95	func (inst *GccgoInstallation) GetImporter(incpaths []string, initmap map[*types.Package]InitData) Importer {
    96		return GetImporter(append(append(incpaths, inst.SearchPaths()...), "."), initmap)
    97	}
    98	

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