1 // Copyright 2014 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 // +build ignore 6 7 package main 8 9 import ( 10 "bytes" 11 "fmt" 12 "io/ioutil" 13 "log" 14 "strconv" 15 "strings" 16 ) 17 18 var gooses, goarches []string 19 20 func main() { 21 data, err := ioutil.ReadFile("../go/build/syslist.go") 22 if err != nil { 23 log.Fatal(err) 24 } 25 const ( 26 goosPrefix = `const goosList = ` 27 goarchPrefix = `const goarchList = ` 28 ) 29 for _, line := range strings.Split(string(data), "\n") { 30 if strings.HasPrefix(line, goosPrefix) { 31 text, err := strconv.Unquote(strings.TrimPrefix(line, goosPrefix)) 32 if err != nil { 33 log.Fatalf("parsing goosList %#q: %v", strings.TrimPrefix(line, goosPrefix), err) 34 } 35 gooses = strings.Fields(text) 36 } 37 if strings.HasPrefix(line, goarchPrefix) { 38 text, err := strconv.Unquote(strings.TrimPrefix(line, goarchPrefix)) 39 if err != nil { 40 log.Fatal("parsing goarchList: %v", err) 41 } 42 goarches = strings.Fields(text) 43 } 44 } 45 46 for _, target := range gooses { 47 var buf bytes.Buffer 48 fmt.Fprintf(&buf, "// generated by gengoos.go using 'go generate'\n\n") 49 if target == "linux" { 50 fmt.Fprintf(&buf, "// +build !android\n\n") // must explicitly exclude android for linux 51 } 52 fmt.Fprintf(&buf, "package runtime\n\n") 53 fmt.Fprintf(&buf, "const theGoos = `%s`\n\n", target) 54 for _, goos := range gooses { 55 value := 0 56 if goos == target { 57 value = 1 58 } 59 fmt.Fprintf(&buf, "const goos_%s = %d\n", goos, value) 60 } 61 err := ioutil.WriteFile("zgoos_"+target+".go", buf.Bytes(), 0666) 62 if err != nil { 63 log.Fatal(err) 64 } 65 } 66 67 for _, target := range goarches { 68 var buf bytes.Buffer 69 fmt.Fprintf(&buf, "// generated by gengoos.go using 'go generate'\n\n") 70 fmt.Fprintf(&buf, "package runtime\n\n") 71 fmt.Fprintf(&buf, "const theGoarch = `%s`\n\n", target) 72 for _, goarch := range goarches { 73 value := 0 74 if goarch == target { 75 value = 1 76 } 77 fmt.Fprintf(&buf, "const goarch_%s = %d\n", goarch, value) 78 } 79 err := ioutil.WriteFile("zgoarch_"+target+".go", buf.Bytes(), 0666) 80 if err != nil { 81 log.Fatal(err) 82 } 83 } 84 } 85
