mirror of
git://gcc.gnu.org/git/gcc.git
synced 2025-04-28 04:20:33 +08:00
0cdde1e7ae
On NetBSD, for backwards compatibility, various libc symbols are
renamed to a symbol with a version suffix. For example, this is the
(abbreviated) definition of sigaction:
int sigaction(...) __asm__ ("__sigaction14")
This poses a challenge for libgo, which attempts to link sigaction by
way of an "//extern" comment:
//extern sigaction
func sigaction(...)
This results in a reference to the deprecated compatibility symbol
"sigaction", rather than the desired "__sigaction14" symbol.
This patch introduces a new "//extern-sysinfo" comment to handle this
situation. The new mklinknames.awk script scans a package for these
comments and outputs a "//go:linkname" directive that links the wrapper
to the correct versioned symbol, as determined by parsing the __asm__
annotation on the function's declaration in gen-sysinfo.go.
For now, only the following packages are scanned by mklinknames.awk:
os
os/user
runtime
syscall
gotools/:
* Makefile.am (check-runtime): Add runtime_linknames.go to
--extrafiles.
* Makefile.in: Regenerate.
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/265125
41 lines
1.0 KiB
Go
41 lines
1.0 KiB
Go
// Copyright 2014 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 !plan9
|
|
// +build !windows
|
|
// +build !js
|
|
|
|
package runtime
|
|
|
|
import "unsafe"
|
|
|
|
// read calls the read system call.
|
|
// It returns a non-negative number of bytes written or a negative errno value.
|
|
//go:noescape
|
|
func read(fd int32, p unsafe.Pointer, n int32) int32
|
|
|
|
func closefd(fd int32) int32
|
|
|
|
//extern-sysinfo exit
|
|
func exit(code int32)
|
|
func usleep(usec uint32)
|
|
|
|
// write calls the write system call.
|
|
// It returns a non-negative number of bytes written or a negative errno value.
|
|
//go:noescape
|
|
func write1(fd uintptr, p unsafe.Pointer, n int32) int32
|
|
|
|
//go:noescape
|
|
func open(name *byte, mode, perm int32) int32
|
|
|
|
// exitThread terminates the current thread, writing *wait = 0 when
|
|
// the stack is safe to reclaim.
|
|
func exitThread(wait *uint32) {
|
|
// This is never used by gccgo.
|
|
throw("exitThread")
|
|
}
|
|
|
|
// So that the C initialization code can call osinit.
|
|
//go:linkname osinit runtime.osinit
|