[dev.cc] runtime: generate GOOS- and GOARCH-specific files with go generate
Eventually I'd like almost everything cmd/dist generates
to be done with 'go generate' and checked in, to simplify
the bootstrap process. The only thing cmd/dist really needs
to do is write things like the current experiment info and
the current version.
This is a first step toward that. It replaces the _NaCl etc
constants with generated ones goos_nacl, goos_darwin,
goarch_386, and so on.
LGTM=dave, austin
R=austin, dave, bradfitz
CC=golang-codereviews, iant, r
https://golang.org/cl/174290043
diff --git a/src/runtime/gengoos.go b/src/runtime/gengoos.go
new file mode 100644
index 0000000..029575b
--- /dev/null
+++ b/src/runtime/gengoos.go
@@ -0,0 +1,82 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build ignore
+
+package main
+
+import (
+ "bytes"
+ "fmt"
+ "io/ioutil"
+ "log"
+ "strconv"
+ "strings"
+)
+
+var gooses, goarches []string
+
+func main() {
+ data, err := ioutil.ReadFile("../go/build/syslist.go")
+ if err != nil {
+ log.Fatal(err)
+ }
+ const (
+ goosPrefix = `const goosList = `
+ goarchPrefix = `const goarchList = `
+ )
+ for _, line := range strings.Split(string(data), "\n") {
+ if strings.HasPrefix(line, goosPrefix) {
+ text, err := strconv.Unquote(strings.TrimPrefix(line, goosPrefix))
+ if err != nil {
+ log.Fatalf("parsing goosList %#q: %v", strings.TrimPrefix(line, goosPrefix), err)
+ }
+ gooses = strings.Fields(text)
+ }
+ if strings.HasPrefix(line, goarchPrefix) {
+ text, err := strconv.Unquote(strings.TrimPrefix(line, goarchPrefix))
+ if err != nil {
+ log.Fatal("parsing goarchList: %v", err)
+ }
+ goarches = strings.Fields(text)
+ }
+ }
+
+ for _, target := range gooses {
+ var buf bytes.Buffer
+ fmt.Fprintf(&buf, "// generated by gengoos.go using 'go generate'\n\n")
+ fmt.Fprintf(&buf, "// +build %s\n\n", target) // usually redundant, but not always; see linux vs android
+ fmt.Fprintf(&buf, "package runtime\n\n")
+ fmt.Fprintf(&buf, "const theGoos = `%s`\n\n", target)
+ for _, goos := range gooses {
+ value := 0
+ if goos == target {
+ value = 1
+ }
+ fmt.Fprintf(&buf, "const goos_%s = %d\n", goos, value)
+ }
+ err := ioutil.WriteFile("zgoos_"+target+".go", buf.Bytes(), 0666)
+ if err != nil {
+ log.Fatal(err)
+ }
+ }
+
+ for _, target := range goarches {
+ var buf bytes.Buffer
+ fmt.Fprintf(&buf, "// generated by gengoos.go using 'go generate'\n\n")
+ fmt.Fprintf(&buf, "package runtime\n\n")
+ fmt.Fprintf(&buf, "const theGoarch = `%s`\n\n", target)
+ for _, goarch := range goarches {
+ value := 0
+ if goarch == target {
+ value = 1
+ }
+ fmt.Fprintf(&buf, "const goarch_%s = %d\n", goarch, value)
+ }
+ err := ioutil.WriteFile("zgoarch_"+target+".go", buf.Bytes(), 0666)
+ if err != nil {
+ log.Fatal(err)
+ }
+ }
+}
