X-Git-Url: http://git.ozlabs.org/?a=blobdiff_plain;f=ccan%2Fcast%2Ftest%2Fcompile_fail-cast_const-sizesame.c;fp=ccan%2Fcast%2Ftest%2Fcompile_fail-cast_const-sizesame.c;h=d401cc8ca91c488c159fb8f0d0bdb63bb0fd9df4;hb=118ace351b789dfaca8866f84a8cd4b924941268;hp=0000000000000000000000000000000000000000;hpb=ce6eef4132acad78ae04a9e7c388ef932fb6411d;p=ccan

diff --git a/ccan/cast/test/compile_fail-cast_const-sizesame.c b/ccan/cast/test/compile_fail-cast_const-sizesame.c
new file mode 100644
index 00000000..d401cc8c
--- /dev/null
+++ b/ccan/cast/test/compile_fail-cast_const-sizesame.c
@@ -0,0 +1,28 @@
+#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
+#ifdef FAIL
+		struct char_struct
+#else
+		char
+#endif
+		*p = NULL;
+
+	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