// 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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"bytes"
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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 sys
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//
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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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//
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func mkzversion(dir, file string) {
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var buf bytes.Buffer
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fmt.Fprintf(&buf, "// Code generated by go tool dist; DO NOT EDIT.\n")
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fmt.Fprintln(&buf)
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fmt.Fprintf(&buf, "package sys\n")
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fmt.Fprintln(&buf)
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fmt.Fprintf(&buf, "const TheVersion = `%s`\n", findgoversion())
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fmt.Fprintf(&buf, "const Goexperiment = `%s`\n", os.Getenv("GOEXPERIMENT"))
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fmt.Fprintf(&buf, "const StackGuardMultiplierDefault = %d\n", stackGuardMultiplierDefault())
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writefile(buf.String(), file, writeSkipSame)
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}
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// mkzbootstrap writes cmd/internal/objabi/zbootstrap.go:
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//
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// package objabi
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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 defaultGOMIPS = <gomips>
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// const defaultGOMIPS64 = <gomips64>
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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 stackGuardMultiplierDefault = <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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var buf bytes.Buffer
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fmt.Fprintf(&buf, "// Code generated by go tool dist; DO NOT EDIT.\n")
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fmt.Fprintln(&buf)
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fmt.Fprintf(&buf, "package objabi\n")
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fmt.Fprintln(&buf)
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fmt.Fprintf(&buf, "import \"runtime\"\n")
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fmt.Fprintln(&buf)
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fmt.Fprintf(&buf, "const defaultGO386 = `%s`\n", go386)
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fmt.Fprintf(&buf, "const defaultGOARM = `%s`\n", goarm)
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fmt.Fprintf(&buf, "const defaultGOMIPS = `%s`\n", gomips)
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fmt.Fprintf(&buf, "const defaultGOMIPS64 = `%s`\n", gomips64)
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fmt.Fprintf(&buf, "const defaultGOOS = runtime.GOOS\n")
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fmt.Fprintf(&buf, "const defaultGOARCH = runtime.GOARCH\n")
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fmt.Fprintf(&buf, "const defaultGO_EXTLINK_ENABLED = `%s`\n", goextlinkenabled)
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fmt.Fprintf(&buf, "const version = `%s`\n", findgoversion())
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fmt.Fprintf(&buf, "const stackGuardMultiplierDefault = %d\n", stackGuardMultiplierDefault())
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fmt.Fprintf(&buf, "const goexperiment = `%s`\n", os.Getenv("GOEXPERIMENT"))
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writefile(buf.String(), file, writeSkipSame)
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}
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// stackGuardMultiplierDefault 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 stackGuardMultiplierDefault() 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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