X-Git-Url: https://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Fcast%2Ftest%2Fcompile_fail-cast_signed-const.c;h=26bf8974ea48d6e82e6dda4de0f71f6f0878bd9e;hp=4e67dc6264491b5e9e61ca15c874884f97b7cc24;hb=HEAD;hpb=118ace351b789dfaca8866f84a8cd4b924941268

diff --git a/ccan/cast/test/compile_fail-cast_signed-const.c b/ccan/cast/test/compile_fail-cast_signed-const.c
index 4e67dc62..26bf8974 100644
--- a/ccan/cast/test/compile_fail-cast_signed-const.c
+++ b/ccan/cast/test/compile_fail-cast_signed-const.c
@@ -1,7 +1,7 @@
 #include <ccan/cast/cast.h>
 #include <stdlib.h>
 
-int main(int argc, char *argv[])
+int main(void)
 {
 	unsigned char *uc;
 #ifdef FAIL
@@ -11,5 +11,12 @@ int main(int argc, char *argv[])
 		*p = NULL;
 
 	uc = cast_signed(unsigned 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