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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.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Issue 17537. The void* cast introduced by cgo to avoid problems
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// with const/volatile qualifiers breaks C preprocessor macros that
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// emulate functions.
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package cgotest
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/*
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#include <stdlib.h>
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typedef struct {
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int i;
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} S17537;
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int I17537(S17537 *p);
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#define I17537(p) ((p)->i)
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// Calling this function used to fail without the cast.
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const int F17537(const char **p) {
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return **p;
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}
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// Calling this function used to trigger an error from the C compiler
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// (issue 18298).
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void F18298(const void *const *p) {
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}
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// Test that conversions between typedefs work as they used to.
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typedef const void *T18298_1;
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struct S18298 { int i; };
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typedef const struct S18298 *T18298_2;
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void G18298(T18298_1 t) {
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}
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*/
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import "C"
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import "testing"
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func test17537(t *testing.T) {
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v := C.S17537{i: 17537}
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if got, want := C.I17537(&v), C.int(17537); got != want {
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t.Errorf("got %d, want %d", got, want)
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}
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p := (*C.char)(C.malloc(1))
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*p = 17
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if got, want := C.F17537(&p), C.int(17); got != want {
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t.Errorf("got %d, want %d", got, want)
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}
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C.F18298(nil)
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var v18298 C.T18298_2
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C.G18298(C.T18298_1(v18298))
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}
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