X-Git-Url: http://git.ozlabs.org/?a=blobdiff_plain;f=ccan%2Fcast%2Ftest%2Fcompile_fail-cast_const.c;h=24ee4b1f00140ac662c8026e37b3adf1b5996b7b;hb=bc6d22ecf820d0b4547ace17ff7e7ecebf0e415b;hp=bb8de94f4c2212e0a5e1a27d41b0d2cb0d01017f;hpb=118ace351b789dfaca8866f84a8cd4b924941268;p=ccan

diff --git a/ccan/cast/test/compile_fail-cast_const.c b/ccan/cast/test/compile_fail-cast_const.c
index bb8de94f..24ee4b1f 100644
--- a/ccan/cast/test/compile_fail-cast_const.c
+++ b/ccan/cast/test/compile_fail-cast_const.c
@@ -1,17 +1,29 @@
 #include <ccan/cast/cast.h>
 #include <stdlib.h>
 
-int main(int argc, char *argv[])
+/* Note: this *isn't* sizeof(char) on all platforms. */
+struct char_struct {
+	char c;
+};
+
+int main(void)
 {
 	char *uc;
-	const 
+	const
 #ifdef FAIL
-		int
+		struct char_struct
 #else
 		char
 #endif
 		*p = NULL;
 
 	uc = cast_const(char *, p);
+	(void) uc; /* Suppress unused-but-set-variable warning. */
 	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