| 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 | exec "golang.org/x/sys/execabs" |
| 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.CombinedOutput() |
| 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 | return nil, errors.New(s) |
| 25 | } |
| 26 | if len(out) > 0 { |
| 27 | flags = strings.Fields(string(out)) |
| 28 | } |
| 29 | return |
| 30 | } |
| 31 | |
| 32 | // pkgConfigFlags calls pkg-config if needed and returns the cflags |
| 33 | // needed to build the package. |
| 34 | func pkgConfigFlags(p *build.Package) (cflags []string, err error) { |
| 35 | if len(p.CgoPkgConfig) == 0 { |
| 36 | return nil, nil |
| 37 | } |
| 38 | return pkgConfig("--cflags", p.CgoPkgConfig) |
| 39 | } |
| 40 |
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