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 9 package cgotest 10 11 /* 12 #include <stdlib.h> 13 14 typedef struct { 15 int i; 16 } S17537; 17 18 int I17537(S17537 *p); 19 20 #define I17537(p) ((p)->i) 21 22 // Calling this function used to fail without the cast. 23 const 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). 29 void F18298(const void *const *p) { 30 } 31 32 // Test that conversions between typedefs work as they used to. 33 typedef const void *T18298_1; 34 struct S18298 { int i; }; 35 typedef const struct S18298 *T18298_2; 36 void G18298(T18298_1 t) { 37 } 38 */ 39 import "C" 40 41 import "testing" 42 43 func 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
