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cgo_pkgconfig.go (1140B)

      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 cgo
      6 
      7 import (
      8 	"errors"
      9 	"fmt"
     10 	"go/build"
     11 	"os/exec"
     12 	"strings"
     13 )
     14 
     15 // pkgConfig runs pkg-config with the specified arguments and returns the flags it prints.
     16 func pkgConfig(mode string, pkgs []string) (flags []string, err error) {
     17 	cmd := exec.Command("pkg-config", append([]string{mode}, pkgs...)...)
     18 	out, err := cmd.Output()
     19 	if err != nil {
     20 		s := fmt.Sprintf("%s failed: %v", strings.Join(cmd.Args, " "), err)
     21 		if len(out) > 0 {
     22 			s = fmt.Sprintf("%s: %s", s, out)
     23 		}
     24 		if err, ok := err.(*exec.ExitError); ok && len(err.Stderr) > 0 {
     25 			s = fmt.Sprintf("%s\nstderr:\n%s", s, err.Stderr)
     26 		}
     27 		return nil, errors.New(s)
     28 	}
     29 	if len(out) > 0 {
     30 		flags = strings.Fields(string(out))
     31 	}
     32 	return
     33 }
     34 
     35 // pkgConfigFlags calls pkg-config if needed and returns the cflags
     36 // needed to build the package.
     37 func pkgConfigFlags(p *build.Package) (cflags []string, err error) {
     38 	if len(p.CgoPkgConfig) == 0 {
     39 		return nil, nil
     40 	}
     41 	return pkgConfig("--cflags", p.CgoPkgConfig)
     42 }