cgo_pkgconfig.go

Documentation: golang.org/x/tools/go/internal/cgo

     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  }
    43
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