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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 (
"bytes"
"fmt"
"os"
"strings"
)
/*
* Helpers for building runtime.
*/
// mkzversion writes zversion.go:
//
// package sys
//
// const TheVersion = <version>
// const Goexperiment = <goexperiment>
// const StackGuardMultiplier = <multiplier value>
//
func mkzversion(dir, file string) {
var buf bytes.Buffer
fmt.Fprintf(&buf, "// Code generated by go tool dist; DO NOT EDIT.\n")
fmt.Fprintln(&buf)
fmt.Fprintf(&buf, "package sys\n")
fmt.Fprintln(&buf)
fmt.Fprintf(&buf, "const TheVersion = `%s`\n", findgoversion())
fmt.Fprintf(&buf, "const Goexperiment = `%s`\n", os.Getenv("GOEXPERIMENT"))
fmt.Fprintf(&buf, "const StackGuardMultiplierDefault = %d\n", stackGuardMultiplierDefault())
writefile(buf.String(), file, writeSkipSame)
}
// mkzbootstrap writes cmd/internal/objabi/zbootstrap.go:
//
// package objabi
//
// const defaultGOROOT = <goroot>
// const defaultGO386 = <go386>
// const defaultGOARM = <goarm>
// const defaultGOMIPS = <gomips>
// const defaultGOMIPS64 = <gomips64>
// const defaultGOPPC64 = <goppc64>
// const defaultGOOS = runtime.GOOS
// const defaultGOARCH = runtime.GOARCH
// const defaultGO_EXTLINK_ENABLED = <goextlinkenabled>
// const version = <version>
// const stackGuardMultiplierDefault = <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) {
var buf bytes.Buffer
fmt.Fprintf(&buf, "// Code generated by go tool dist; DO NOT EDIT.\n")
fmt.Fprintln(&buf)
fmt.Fprintf(&buf, "package objabi\n")
fmt.Fprintln(&buf)
fmt.Fprintf(&buf, "import \"runtime\"\n")
fmt.Fprintln(&buf)
fmt.Fprintf(&buf, "const defaultGO386 = `%s`\n", go386)
fmt.Fprintf(&buf, "const defaultGOARM = `%s`\n", goarm)
fmt.Fprintf(&buf, "const defaultGOMIPS = `%s`\n", gomips)
fmt.Fprintf(&buf, "const defaultGOMIPS64 = `%s`\n", gomips64)
fmt.Fprintf(&buf, "const defaultGOPPC64 = `%s`\n", goppc64)
fmt.Fprintf(&buf, "const defaultGOOS = runtime.GOOS\n")
fmt.Fprintf(&buf, "const defaultGOARCH = runtime.GOARCH\n")
fmt.Fprintf(&buf, "const defaultGO_EXTLINK_ENABLED = `%s`\n", goextlinkenabled)
fmt.Fprintf(&buf, "const defaultGO_LDSO = `%s`\n", defaultldso)
fmt.Fprintf(&buf, "const version = `%s`\n", findgoversion())
fmt.Fprintf(&buf, "const stackGuardMultiplierDefault = %d\n", stackGuardMultiplierDefault())
fmt.Fprintf(&buf, "const goexperiment = `%s`\n", os.Getenv("GOEXPERIMENT"))
writefile(buf.String(), file, writeSkipSame)
}
// stackGuardMultiplierDefault 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 stackGuardMultiplierDefault() int {
for _, s := range strings.Split(os.Getenv("GO_GCFLAGS"), " ") {
if s == "-N" {
return 2
}
}
return 1
}
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