1// Copyright 2016 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5// Issue 17537.  The void* cast introduced by cgo to avoid problems
6// with const/volatile qualifiers breaks C preprocessor macros that
7// emulate functions.
8
9package cgotest
10
11/*
12#include <stdlib.h>
13
14typedef struct {
15	int i;
16} S17537;
17
18int I17537(S17537 *p);
19
20#define I17537(p) ((p)->i)
21
22// Calling this function used to fail without the cast.
23const int F17537(const char **p) {
24	return **p;
25}
26
27// Calling this function used to trigger an error from the C compiler
28// (issue 18298).
29void F18298(const void *const *p) {
30}
31
32// Test that conversions between typedefs work as they used to.
33typedef const void *T18298_1;
34struct S18298 { int i; };
35typedef const struct S18298 *T18298_2;
36void G18298(T18298_1 t) {
37}
38*/
39import "C"
40
41import "testing"
42
43func test17537(t *testing.T) {
44	v := C.S17537{i: 17537}
45	if got, want := C.I17537(&v), C.int(17537); got != want {
46		t.Errorf("got %d, want %d", got, want)
47	}
48
49	p := (*C.char)(C.malloc(1))
50	*p = 17
51	if got, want := C.F17537(&p), C.int(17); got != want {
52		t.Errorf("got %d, want %d", got, want)
53	}
54
55	C.F18298(nil)
56	var v18298 C.T18298_2
57	C.G18298(C.T18298_1(v18298))
58}
59