X-Git-Url: https://git.ozlabs.org/?a=blobdiff_plain;f=ccan%2Fbytestring%2Ftest%2Fcompile_fail-BYTESTRING-2.c;h=d4a610e250e5bb0c0d3620e11fca944dac961a18;hb=f6557ca6537bc4d37fb4be215184a632533ba4e7;hp=7ab06f82163d9cf3fe60be33a8accf20cf1e7415;hpb=8253b9dd5d279793e267ed5dfcc4c0f2cfbaeb83;p=ccan

diff --git a/ccan/bytestring/test/compile_fail-BYTESTRING-2.c b/ccan/bytestring/test/compile_fail-BYTESTRING-2.c
index 7ab06f82..d4a610e2 100644
--- a/ccan/bytestring/test/compile_fail-BYTESTRING-2.c
+++ b/ccan/bytestring/test/compile_fail-BYTESTRING-2.c
@@ -1,7 +1,15 @@
+#include "config.h"
+
 #include <stdio.h>
 
 #include <ccan/bytestring/bytestring.h>
 
+/*
+ * BYTESTRING() can only be used safely on a literal string (or,
+ * strictly, something whose size can be determined with ARRAY_SIZE().
+ * This checks that it correctly fails to compile if used on a
+ * non-array pointer.
+ */
 int main(int argc, char *argv[])
 {
 	struct bytestring bs;
@@ -9,6 +17,8 @@ int main(int argc, char *argv[])
 
 #ifdef FAIL
 	bs = BYTESTRING(x);
+#else
+	bs.len = 0;
 #endif
 	printf("%zd %s\n", bs.len, x);
 	return 0;