mirror of
https://github.com/golang/go
synced 2024-11-14 20:30:35 -07:00
10f3b09027
Now that we try to handle qualifiers correctly (as of CL 33325), don't strip them from a void* pointer. Otherwise we break a case like "const void**", as the "const" qualifier is dropped and the resulting "void**" triggers a warning from the C compiler. Fixes #18298. Change-Id: If51df1889b0f6a907715298c152e6d4584747acb Reviewed-on: https://go-review.googlesource.com/34370 Run-TryBot: Ian Lance Taylor <iant@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
59 lines
1.2 KiB
Go
59 lines
1.2 KiB
Go
// Copyright 2016 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.
|
|
|
|
// Issue 17537. The void* cast introduced by cgo to avoid problems
|
|
// with const/volatile qualifiers breaks C preprocessor macros that
|
|
// emulate functions.
|
|
|
|
package cgotest
|
|
|
|
/*
|
|
#include <stdlib.h>
|
|
|
|
typedef struct {
|
|
int i;
|
|
} S17537;
|
|
|
|
int I17537(S17537 *p);
|
|
|
|
#define I17537(p) ((p)->i)
|
|
|
|
// Calling this function used to fail without the cast.
|
|
const int F17537(const char **p) {
|
|
return **p;
|
|
}
|
|
|
|
// Calling this function used to trigger an error from the C compiler
|
|
// (issue 18298).
|
|
void F18298(const void *const *p) {
|
|
}
|
|
|
|
// Test that conversions between typedefs work as they used to.
|
|
typedef const void *T18298_1;
|
|
struct S18298 { int i; };
|
|
typedef const struct S18298 *T18298_2;
|
|
void G18298(T18298_1 t) {
|
|
}
|
|
*/
|
|
import "C"
|
|
|
|
import "testing"
|
|
|
|
func test17537(t *testing.T) {
|
|
v := C.S17537{i: 17537}
|
|
if got, want := C.I17537(&v), C.int(17537); got != want {
|
|
t.Errorf("got %d, want %d", got, want)
|
|
}
|
|
|
|
p := (*C.char)(C.malloc(1))
|
|
*p = 17
|
|
if got, want := C.F17537(&p), C.int(17); got != want {
|
|
t.Errorf("got %d, want %d", got, want)
|
|
}
|
|
|
|
C.F18298(nil)
|
|
var v18298 C.T18298_2
|
|
C.G18298(C.T18298_1(v18298))
|
|
}
|