cmd/cgo: work around bug in clang debug info for builtins like memset

Fixes issue 6506.

R=golang-dev, r
CC=golang-dev
https://codereview.appspot.com/14682044

1 files changed, 52 insertions, 0 deletions

diff --git a/misc/cgo/test/issue6506.go b/misc/cgo/test/issue6506.go
new file mode 100644
index 000000000..e2a733206
--- /dev/null
+++ b/misc/cgo/test/issue6506.go
@@ -0,0 +1,52 @@
+// Copyright 2013 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 cgotest
+
+// Test handling of size_t in the face of incorrect clang debug information.
+// golang.org/issue/6506.
+
+/*
+#include <stdlib.h>
+#include <string.h>
+
+// These functions are clang builtins but not standard on other systems.
+// Give them prototypes so that this test can be compiled on other systems.
+// One of the great things about this bug is that even with these prototypes
+// clang still generates the wrong debug information.
+
+void bzero(void*, size_t);
+int bcmp(const void*, const void*, size_t);
+int strncasecmp(const char*, const char*, size_t n);
+size_t strlcpy(char*, const char*, size_t);
+size_t strlcat(char*, const char*, size_t);
+*/
+import "C"
+
+func test6506() {
+	// nothing to run, just make sure this compiles
+	var x C.size_t
+
+	C.calloc(x, x)
+	C.malloc(x)
+	C.realloc(nil, x)
+	C.memcpy(nil, nil, x)
+	C.memcmp(nil, nil, x)
+	C.memmove(nil, nil, x)
+	C.strncpy(nil, nil, x)
+	C.strncmp(nil, nil, x)
+	C.strncat(nil, nil, x)
+	x = C.strxfrm(nil, nil, x)
+	C.memchr(nil, 0, x)
+	x = C.strcspn(nil, nil)
+	x = C.strspn(nil, nil)
+	C.memset(nil, 0, x)
+	x = C.strlen(nil)
+	C.alloca(x)
+	C.bzero(nil, x)
+	C.strncasecmp(nil, nil, x)
+	x = C.strlcpy(nil, nil, x)
+	x = C.strlcat(nil, nil, x)
+	_ = x
+}