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// Copyright 2012 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.
package main
import (
"fmt"
"os"
"strings"
)
/*
* Helpers for building runtime.
*/
// mkzversion writes zversion.go:
//
// package sys
// const DefaultGoroot = <goroot>
// const TheVersion = <version>
// const Goexperiment = <goexperiment>
// const StackGuardMultiplier = <multiplier value>
//
func mkzversion(dir, file string) {
out := fmt.Sprintf(
"// auto generated by go tool dist\n"+
"\n"+
"package sys\n"+
"\n"+
"const DefaultGoroot = `%s`\n"+
"const TheVersion = `%s`\n"+
"const Goexperiment = `%s`\n"+
"const StackGuardMultiplier = %d\n\n", goroot_final, findgoversion(), os.Getenv("GOEXPERIMENT"), stackGuardMultiplier())
writefile(out, file, writeSkipSame)
}
// mkzbootstrap writes cmd/internal/obj/zbootstrap.go:
//
// package obj
//
// const defaultGOROOT = <goroot>
// const defaultGO386 = <go386>
// const defaultGOARM = <goarm>
// const defaultGOOS = runtime.GOOS
// const defaultGOARCH = runtime.GOARCH
// const defaultGO_EXTLINK_ENABLED = <goextlinkenabled>
// const version = <version>
// const stackGuardMultiplier = <multiplier value>
// 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/compile
//
// 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 = runtime.GOOS\n"+
"const defaultGOARCH = runtime.GOARCH\n"+
"const defaultGO_EXTLINK_ENABLED = `%s`\n"+
"const version = `%s`\n"+
"const stackGuardMultiplier = %d\n"+
"const goexperiment = `%s`\n",
goroot_final, go386, goarm, goextlinkenabled, findgoversion(), stackGuardMultiplier(), os.Getenv("GOEXPERIMENT"))
writefile(out, file, writeSkipSame)
}
// stackGuardMultiplier returns a multiplier to apply to the default
// stack guard size. Larger multipliers are used for non-optimized
// builds that have larger stack frames.
func stackGuardMultiplier() int {
for _, s := range strings.Split(os.Getenv("GO_GCFLAGS"), " ") {
if s == "-N" {
return 2
}
}
return 1
}
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