cast: fix cast of void * when we don't have GCC features.

[ccan] / ccan / cast / test / compile_fail-cast_const.c

diff --git a/ccan/cast/test/compile_fail-cast_const.c b/ccan/cast/test/compile_fail-cast_const.c
index bb8de94f4c2212e0a5e1a27d41b0d2cb0d01017f..d401cc8ca91c488c159fb8f0d0bdb63bb0fd9df4 100644 (file)
--- a/ccan/cast/test/compile_fail-cast_const.c
+++ b/ccan/cast/test/compile_fail-cast_const.c
@@ -1,12 +1,17 @@
 #include <ccan/cast/cast.h>
 #include <stdlib.h>
 
+/* Note: this *isn't* sizeof(char) on all platforms. */
+struct char_struct {
+       char c;
+};
+
 int main(int argc, char *argv[])
 {
        char *uc;
-       const 
+       const
 #ifdef FAIL
-               int
+               struct char_struct
 #else
                char
 #endif
@@ -15,3 +20,9 @@ int main(int argc, char *argv[])
        uc = cast_const(char *, p);
        return 0;
 }
+
+#ifdef FAIL
+#if !HAVE_TYPEOF||!HAVE_BUILTIN_CHOOSE_EXPR||!HAVE_BUILTIN_TYPES_COMPATIBLE_P
+#error "Unfortunately we don't fail if cast_const can only use size"
+#endif
+#endif