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7061dc3f6e
The top-level qualifiers are unimportant for our purposes. If a C function is defined as `const int f(const int i)`, the `const`s are meaningless to C, and we want to avoid using them in the struct we create where the `const` has a completely different meaning. This unwinds https://golang.org/cl/33097 with regard to top-level qualifiers. Change-Id: I3d66b0eb43b6d9a586d9cdedfae5a2306b46d96c Reviewed-on: https://go-review.googlesource.com/33325 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
43 lines
887 B
Go
43 lines
887 B
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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*/
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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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}
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