more tags for go/build

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5490047

src/cmd/godoc/appinit.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build ignore
+
 package main
 
 // This file replaces main.go when running godoc under app-engine.

src/pkg/exp/terminal/terminal.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build linux
+
 package terminal
 
 import "io"

src/pkg/exp/terminal/terminal_test.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build linux
+
 package terminal
 
 import (

src/pkg/exp/terminal/util.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build linux
+
 // Package terminal provides support functions for dealing with terminals, as
 // commonly found on UNIX systems.
 //

src/pkg/exp/winfsnotify/winfsnotify.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build windows
+
 // Package winfsnotify allows the user to receive
 // file system event notifications on Windows.
 package winfsnotify

src/pkg/exp/winfsnotify/winfsnotify_test.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build windows
+
 package winfsnotify
 
 import (

src/pkg/exp/wingui/Makefile

@@ -18,6 +18,7 @@ GOFILES=\
 include ../../../Make.cmd
 
 zwinapi.go: winapi.go
-	$(GOROOT)/src/pkg/syscall/mksyscall_windows.pl $< \
+	(echo '// +build windows'; \
+	$(GOROOT)/src/pkg/syscall/mksyscall_windows.pl $<) \
 		| gofmt \
 		> $@

src/pkg/exp/wingui/gui.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build windows
+
 package main
 
 import (

src/pkg/exp/wingui/winapi.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build windows
+
 package main
 
 import (

src/pkg/exp/wingui/zwinapi.go

+// +build windows
 // mksyscall_windows.pl winapi.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT