mirror of
https://github.com/golang/go
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8628688304
Change-Id: Ifb8e4e13c7778a7c0113190051415e096f5db94f Reviewed-on: https://go-review.googlesource.com/11390 Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com> Reviewed-by: Andrew Gerrand <adg@golang.org>
97 lines
2.7 KiB
Go
97 lines
2.7 KiB
Go
// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"fmt"
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"os"
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"strings"
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)
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/*
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* Helpers for building runtime.
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*/
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// mkzversion writes zversion.go:
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//
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// package runtime
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// const defaultGoroot = <goroot>
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// const theVersion = <version>
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// const goexperiment = <goexperiment>
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// const stackGuardMultiplier = <multiplier value>
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// const buildVersion = <build version>
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//
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func mkzversion(dir, file string) {
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out := fmt.Sprintf(
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"// auto generated by go tool dist\n"+
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"\n"+
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"package runtime\n"+
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"\n"+
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"const defaultGoroot = `%s`\n"+
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"const theVersion = `%s`\n"+
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"const goexperiment = `%s`\n"+
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"const stackGuardMultiplier = %d\n"+
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"var buildVersion = theVersion\n", goroot_final, findgoversion(), os.Getenv("GOEXPERIMENT"), stackGuardMultiplier())
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writefile(out, file, writeSkipSame)
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}
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// mkzbootstrap writes cmd/internal/obj/zbootstrap.go:
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//
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// package obj
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//
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// const defaultGOROOT = <goroot>
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// const defaultGO386 = <go386>
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// const defaultGOARM = <goarm>
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// const defaultGOOS = runtime.GOOS
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// const defaultGOARCH = runtime.GOARCH
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// const defaultGO_EXTLINK_ENABLED = <goextlinkenabled>
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// const version = <version>
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// const stackGuardMultiplier = <multiplier value>
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// const goexperiment = <goexperiment>
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//
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// The use of runtime.GOOS and runtime.GOARCH makes sure that
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// a cross-compiled compiler expects to compile for its own target
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// system. That is, if on a Mac you do:
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//
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// GOOS=linux GOARCH=ppc64 go build cmd/compile
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//
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// the resulting compiler will default to generating linux/ppc64 object files.
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// This is more useful than having it default to generating objects for the
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// original target (in this example, a Mac).
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func mkzbootstrap(file string) {
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out := fmt.Sprintf(
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"// auto generated by go tool dist\n"+
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"\n"+
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"package obj\n"+
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"\n"+
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"import \"runtime\"\n"+
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"\n"+
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"const defaultGOROOT = `%s`\n"+
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"const defaultGO386 = `%s`\n"+
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"const defaultGOARM = `%s`\n"+
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"const defaultGOOS = runtime.GOOS\n"+
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"const defaultGOARCH = runtime.GOARCH\n"+
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"const defaultGO_EXTLINK_ENABLED = `%s`\n"+
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"const version = `%s`\n"+
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"const stackGuardMultiplier = %d\n"+
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"const goexperiment = `%s`\n",
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goroot_final, go386, goarm, goextlinkenabled, findgoversion(), stackGuardMultiplier(), os.Getenv("GOEXPERIMENT"))
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writefile(out, file, writeSkipSame)
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}
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// stackGuardMultiplier returns a multiplier to apply to the default
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// stack guard size. Larger multipliers are used for non-optimized
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// builds that have larger stack frames.
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func stackGuardMultiplier() int {
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for _, s := range strings.Split(os.Getenv("GO_GCFLAGS"), " ") {
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if s == "-N" {
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return 2
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}
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}
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return 1
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}
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