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cmd/dist: fix default GOOS/GOARCH for cross-compile

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Before this CL, if you are on a darwin/amd64 machine and
cross-compile 9g for a linux/ppc64 machine, when you copy
9g over to that kind of machine and run it, you'll find it thinks
the default object target is darwin/amd64. Not useful.
Make the default target linux/ppc64 in this case. More useful.

Change-Id: I62f2e9cb5f60b3077a922b31cd023a9cb7a6cfda
Reviewed-on: https://go-review.googlesource.com/6407
Reviewed-by: Rob Pike <r@golang.org>
This commit is contained in:
Russ Cox 2015-03-01 19:42:03 -05:00
parent 5324cf2d45
commit 86a7c85f83
1 changed files with 16 additions and 5 deletions
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21
src/cmd/dist/buildruntime.go vendored
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@ -40,27 +40,38 @@ func mkzversion(dir, file string) {
// const defaultGOROOT = <goroot>
// const defaultGO386 = <go386>
// const defaultGOARM = <goarm>
// const defaultGOOS = <goos>
// const defaultGOARCH = <goarch>
// const defaultGOOS = runtime.GOOS
// const defaultGOARCH = runtime.GOARCH
// const defaultGO_EXTLINK_ENABLED = <goextlinkenabled>
// const version = <version>
// const goexperiment = <goexperiment>
//
// The use of runtime.GOOS and runtime.GOARCH makes sure that
// a cross-compiled compiler expects to compile for its own target
// system. That is, if on a Mac you do:
//
// GOOS=linux GOARCH=ppc64 go build cmd/9g
//
// the resulting compiler will default to generating linux/ppc64 object files.
// This is more useful than having it default to generating objects for the
// original target (in this example, a Mac).
func mkzbootstrap(file string) {
out := fmt.Sprintf(
"// auto generated by go tool dist\n"+
"\n"+
"package obj\n"+
"\n"+
"import \"runtime\"\n"+
"\n"+
"const defaultGOROOT = `%s`\n"+
"const defaultGO386 = `%s`\n"+
"const defaultGOARM = `%s`\n"+
"const defaultGOOS = `%s`\n"+
"const defaultGOARCH = `%s`\n"+
"const defaultGOOS = runtime.GOOS\n"+
"const defaultGOARCH = runtime.GOARCH\n"+
"const defaultGO_EXTLINK_ENABLED = `%s`\n"+
"const version = `%s`\n"+
"const goexperiment = `%s`\n",
goroot_final, go386, goarm, gohostos, gohostarch, goextlinkenabled, findgoversion(), os.Getenv("GOEXPERIMENT"))
goroot_final, go386, goarm, goextlinkenabled, findgoversion(), os.Getenv("GOEXPERIMENT"))
writefile(out, file, 0)
}