cmd/cgo: make C function pointers non-assignable

Fixes issue 7757.
Fixes issue 8488.

LGTM=iant
R=iant
CC=golang-codereviews
https://codereview.appspot.com/118690044

Committer: Ian Lance Taylor <iant@golang.org>

2 files changed, 15 insertions, 0 deletions

diff --git a/misc/cgo/errors/issue7757.go b/misc/cgo/errors/issue7757.go
new file mode 100644
index 000000000..5eafd22e8
--- /dev/null
+++ b/misc/cgo/errors/issue7757.go
@@ -0,0 +1,14 @@
+// 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.
+
+package main
+
+/*
+void foo() {}
+*/
+import "C"
+
+func main() {
+	C.foo = C.foo // ERROR HERE
+}
diff --git a/misc/cgo/errors/test.bash b/misc/cgo/errors/test.bash
index f0f60c844..e5bf47a0d 100755
--- a/misc/cgo/errors/test.bash
+++ b/misc/cgo/errors/test.bash
@@ -27,6 +27,7 @@ check() {
 check err1.go
 check err2.go
 check err3.go
+check issue7757.go
 
 rm -rf errs _obj
 exit 0