runtime/cgo: use //go:build lines in C and assembly files

Replace deprecated // +build lines by their respective //go:build line
counterpart. Also remove build constraints implied by file name or type.

Change-Id: I8d18cd40071ca28d7654da8f0d22841f43729ca6
Reviewed-on: https://go-review.googlesource.com/c/go/+/460538
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

src/runtime/cgo/asm_mips64x.s

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build mips64 || mips64le
-// +build mips64 mips64le
 
 #include "textflag.h"
 

src/runtime/cgo/asm_mipsx.s

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build mips || mipsle
-// +build mips mipsle
 
 #include "textflag.h"
 

src/runtime/cgo/asm_ppc64x.s

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build ppc64 || ppc64le
-// +build ppc64 ppc64le
 
 #include "textflag.h"
 #include "asm_ppc64x.h"

src/runtime/cgo/gcc_aix_ppc64.S

@@ -2,9 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build ppc64
-// +build aix
-
 .file "gcc_aix_ppc64.S"
 
 /*

src/runtime/cgo/gcc_aix_ppc64.c

@@ -2,9 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build aix
-// +build ppc64 ppc64le
-
 /*
  * On AIX, call to _cgo_topofstack and Go main are forced to be a longcall.
  * Without it, ld might add trampolines in the middle of .text section

src/runtime/cgo/gcc_context.c

@@ -2,8 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build cgo
-// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris windows
+//go:build unix || windows
 
 #include "libcgo.h"
 

src/runtime/cgo/gcc_fatalf.c

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build aix !android,linux freebsd
+//go:build aix || (!android && linux) || freebsd
 
 #include <stdarg.h>
 #include <stdio.h>

src/runtime/cgo/gcc_freebsd_sigaction.c

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build freebsd,amd64
+//go:build freebsd && amd64
 
 #include <errno.h>
 #include <stddef.h>

src/runtime/cgo/gcc_libinit.c

@@ -2,8 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build cgo
-// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
+//go:build unix
 
 #include <pthread.h>
 #include <errno.h>

src/runtime/cgo/gcc_libinit_windows.c

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build cgo
-
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #include <process.h>

src/runtime/cgo/gcc_linux_mips64x.c

@@ -2,9 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build cgo
-// +build linux
-// +build mips64 mips64le
+//go:build mips64 || mips64le
 
 #include <pthread.h>
 #include <string.h>

src/runtime/cgo/gcc_linux_mipsx.c

@@ -2,9 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build cgo
-// +build linux
-// +build mips mipsle
+//go:build mips || mipsle
 
 #include <pthread.h>
 #include <string.h>

src/runtime/cgo/gcc_linux_ppc64x.S

@@ -2,8 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build ppc64 ppc64le
-// +build linux
+//go:build linux && (ppc64 || ppc64le)
 
 .file "gcc_linux_ppc64x.S"
 

src/runtime/cgo/gcc_mips64x.S

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build mips64 mips64le
+//go:build mips64 || mips64le
 
 .file "gcc_mips64x.S"
 

src/runtime/cgo/gcc_mipsx.S

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build mips mipsle
+//go:build mips || mipsle
 
 .file "gcc_mipsx.S"
 

src/runtime/cgo/gcc_mmap.c

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build linux,amd64 linux,arm64 linux,ppc64le freebsd,amd64
+//go:build (linux && (amd64 || arm64 || ppc64le)) || (freebsd && amd64)
 
 #include <errno.h>
 #include <stdint.h>

src/runtime/cgo/gcc_ppc64x.c

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build ppc64 ppc64le
+//go:build ppc64 || ppc64le
 
 #include <pthread.h>
 #include <string.h>

src/runtime/cgo/gcc_setenv.c

@@ -2,8 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build cgo
-// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
+//go:build unix
 
 #include "libcgo.h"
 

src/runtime/cgo/gcc_sigaction.c

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build linux,amd64 linux,arm64 linux,ppc64le
+//go:build linux && (amd64 || arm64 || ppc64le)
 
 #include <errno.h>
 #include <stddef.h>

src/runtime/cgo/gcc_signal2_ios_arm64.c

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build lldb
+//go:build lldb
 
 // Used by gcc_signal_darwin_arm64.c when doing the test build during cgo.
 // We hope that for real binaries the definition provided by Go will take precedence

src/runtime/cgo/gcc_signal_ios_arm64.c

@@ -17,7 +17,7 @@
 //
 // The dist tool enables this by build flag when testing.
 
-// +build lldb
+//go:build lldb
 
 #include <limits.h>
 #include <pthread.h>

src/runtime/cgo/gcc_signal_ios_nolldb.c

@@ -2,9 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !lldb
-// +build ios
-// +build arm64
+//go:build !lldb && ios && arm64
 
 #include <stdint.h>
 

src/runtime/cgo/gcc_traceback.c

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build cgo,darwin cgo,linux
+//go:build darwin || linux
 
 #include <stdint.h>
 #include "libcgo.h"

src/runtime/cgo/linux_syscall.c

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build linux
+//go:build linux
 
 #ifndef _GNU_SOURCE // setres[ug]id() API.
 #define _GNU_SOURCE