X-Git-Url: http://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Fcast%2Ftest%2Fcompile_fail-cast_const2.c;h=a16cfacf15354c468189d50a4a87d6550da30442;hp=88df4b7a853168141dd3e07fb2bf045fe41c9874;hb=18fe5ef012a96014b9e61e48616e682b4a5708a2;hpb=118ace351b789dfaca8866f84a8cd4b924941268

diff --git a/ccan/cast/test/compile_fail-cast_const2.c b/ccan/cast/test/compile_fail-cast_const2.c
index 88df4b7a..a16cfacf 100644
--- a/ccan/cast/test/compile_fail-cast_const2.c
+++ b/ccan/cast/test/compile_fail-cast_const2.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_const2(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