mirror of
https://github.com/golang/sys.git
synced 2026-02-08 11:46:04 +03:00
ea9bcade75
Right now the process for adding in new constants, errors, or syscalls for Linux is a pain and unreliable. The scripts are designed to be run on the target architecture and use the header files installed on the user's system. This makes it hard to generate files for all the architectures or to have consistency between users. See golang/go#15282. This CL fixes this issue by making all of the files for the 11 supported architectures directly from source checkouts of Linux, glibc, and bluez. This is done using Docker, the gcc cross-compilers, and qemu emulation. Previously discussed here: https://go-review.googlesource.com/c/37589/ A README.md file is also added to explain how all the parts of the build system work. In order to get the build working for all the architectures, I made some changes to the other scripts called from mkall_linux.go: - Files only used for generating linux code, moved to linux/ - linux/mksysnum.pl supports a specified CC compiler. - The generated C code in mkerrors.sh changed to avoid a warning - mkerrors.sh headers changed to fix powerpc64 bug in sys/ioctl.h - linux/types.go no longer needs to export Ptrace structs in lowercase Build instructions: - Host system needs to be x86-64 Linux - Install Docker (https://docs.docker.com/engine/installation/) - ./mkall.sh (That's it!!!) Change-Id: I87067c14442ba12f8d51991349a43a9d73f38ae0 Reviewed-on: https://go-review.googlesource.com/37943 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
89 lines
2.6 KiB
Go
89 lines
2.6 KiB
Go
// Copyright 2016 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.
|
|
|
|
// +build ignore
|
|
|
|
// mkpost processes the output of cgo -godefs to
|
|
// modify the generated types. It is used to clean up
|
|
// the sys API in an architecture specific manner.
|
|
//
|
|
// mkpost is run after cgo -godefs; see README.md.
|
|
package main
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"go/format"
|
|
"io/ioutil"
|
|
"log"
|
|
"os"
|
|
"regexp"
|
|
)
|
|
|
|
func main() {
|
|
// Get the OS and architecture (using GOARCH_TARGET if it exists)
|
|
goos := os.Getenv("GOOS")
|
|
goarch := os.Getenv("GOARCH_TARGET")
|
|
if goarch == "" {
|
|
goarch = os.Getenv("GOARCH")
|
|
}
|
|
// Check that we are using the new build system if we should be.
|
|
if goos == "linux" && goarch != "sparc64" {
|
|
if os.Getenv("GOLANG_SYS_BUILD") != "docker" {
|
|
os.Stderr.WriteString("In the new build system, mkpost should not be called directly.\n")
|
|
os.Stderr.WriteString("See README.md\n")
|
|
os.Exit(1)
|
|
}
|
|
}
|
|
|
|
b, err := ioutil.ReadAll(os.Stdin)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
|
|
// If we have empty Ptrace structs, we should delete them. Only s390x emits
|
|
// nonempty Ptrace structs.
|
|
ptraceRexexp := regexp.MustCompile(`type Ptrace((Psw|Fpregs|Per) struct {\s*})`)
|
|
b = ptraceRexexp.ReplaceAll(b, nil)
|
|
|
|
// Replace the control_regs union with a blank identifier for now.
|
|
controlRegsRegex := regexp.MustCompile(`(Control_regs)\s+\[0\]uint64`)
|
|
b = controlRegsRegex.ReplaceAll(b, []byte("_ [0]uint64"))
|
|
|
|
// Remove fields that are added by glibc
|
|
// Note that this is unstable as the identifers are private.
|
|
removeFieldsRegex := regexp.MustCompile(`X__glibc\S*`)
|
|
b = removeFieldsRegex.ReplaceAll(b, []byte("_"))
|
|
|
|
// We refuse to export private fields on s390x
|
|
if goarch == "s390x" && goos == "linux" {
|
|
// Remove cgo padding fields
|
|
removeFieldsRegex := regexp.MustCompile(`Pad_cgo_\d+`)
|
|
b = removeFieldsRegex.ReplaceAll(b, []byte("_"))
|
|
|
|
// Remove padding, hidden, or unused fields
|
|
removeFieldsRegex = regexp.MustCompile(`X_\S+`)
|
|
b = removeFieldsRegex.ReplaceAll(b, []byte("_"))
|
|
}
|
|
|
|
// Remove the first line of warning from cgo
|
|
b = b[bytes.IndexByte(b, '\n')+1:]
|
|
// Modify the command in the header to include:
|
|
// mkpost, our own warning, and a build tag.
|
|
replacement := fmt.Sprintf(`$1 | go run mkpost.go
|
|
// Code generated by the command above; see README.md. DO NOT EDIT.
|
|
|
|
// +build %s,%s`, goarch, goos)
|
|
cgoCommandRegex := regexp.MustCompile(`(cgo -godefs .*)`)
|
|
b = cgoCommandRegex.ReplaceAll(b, []byte(replacement))
|
|
|
|
// gofmt
|
|
b, err = format.Source(b)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
|
|
os.Stdout.Write(b)
|
|
}
|