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b663783717
For 3rd parties building binary packages, and for build consistency in general, it is very helpful to have the same set of dependencies at any time the product is built. See [tools/godep](https://github.com/tools/godep) for further details.
88 lines
2.6 KiB
Go
88 lines
2.6 KiB
Go
// Copyright 2016 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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// +build ignore
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// mkpost processes the output of cgo -godefs to
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// modify the generated types. It is used to clean up
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// the sys API in an architecture specific manner.
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//
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// mkpost is run after cgo -godefs; see README.md.
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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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"go/format"
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"io/ioutil"
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"log"
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"os"
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"regexp"
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)
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func main() {
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// Get the OS and architecture (using GOARCH_TARGET if it exists)
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goos := os.Getenv("GOOS")
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goarch := os.Getenv("GOARCH_TARGET")
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if goarch == "" {
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goarch = os.Getenv("GOARCH")
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}
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// Check that we are using the new build system if we should be.
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if goos == "linux" && goarch != "sparc64" {
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if os.Getenv("GOLANG_SYS_BUILD") != "docker" {
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os.Stderr.WriteString("In the new build system, mkpost should not be called directly.\n")
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os.Stderr.WriteString("See README.md\n")
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os.Exit(1)
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}
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}
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b, err := ioutil.ReadAll(os.Stdin)
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if err != nil {
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log.Fatal(err)
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}
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// If we have empty Ptrace structs, we should delete them. Only s390x emits
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// nonempty Ptrace structs.
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ptraceRexexp := regexp.MustCompile(`type Ptrace((Psw|Fpregs|Per) struct {\s*})`)
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b = ptraceRexexp.ReplaceAll(b, nil)
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// Replace the control_regs union with a blank identifier for now.
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controlRegsRegex := regexp.MustCompile(`(Control_regs)\s+\[0\]uint64`)
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b = controlRegsRegex.ReplaceAll(b, []byte("_ [0]uint64"))
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// Remove fields that are added by glibc
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// Note that this is unstable as the identifers are private.
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removeFieldsRegex := regexp.MustCompile(`X__glibc\S*`)
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b = removeFieldsRegex.ReplaceAll(b, []byte("_"))
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// We refuse to export private fields on s390x
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if goarch == "s390x" && goos == "linux" {
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// Remove cgo padding fields
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removeFieldsRegex := regexp.MustCompile(`Pad_cgo_\d+`)
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b = removeFieldsRegex.ReplaceAll(b, []byte("_"))
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// Remove padding, hidden, or unused fields
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removeFieldsRegex = regexp.MustCompile(`X_\S+`)
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b = removeFieldsRegex.ReplaceAll(b, []byte("_"))
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}
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// Remove the first line of warning from cgo
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b = b[bytes.IndexByte(b, '\n')+1:]
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// Modify the command in the header to include:
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// mkpost, our own warning, and a build tag.
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replacement := fmt.Sprintf(`$1 | go run mkpost.go
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// Code generated by the command above; see README.md. DO NOT EDIT.
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// +build %s,%s`, goarch, goos)
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cgoCommandRegex := regexp.MustCompile(`(cgo -godefs .*)`)
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b = cgoCommandRegex.ReplaceAll(b, []byte(replacement))
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// gofmt
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b, err = format.Source(b)
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if err != nil {
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log.Fatal(err)
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}
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os.Stdout.Write(b)
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}
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