base64: fix for unsigned chars (e.g. ARM).

[ccan] / ccan / str / test / compile_fail-isalpha.c

diff --git a/ccan/str/test/compile_fail-isalpha.c b/ccan/str/test/compile_fail-isalpha.c
index 76de15041ce537a876ce8bd15c32a07b5e33af02..33d365538aff0a28c6f5b7f36119363ab6d7ae71 100644 (file)
--- a/ccan/str/test/compile_fail-isalpha.c
+++ b/ccan/str/test/compile_fail-isalpha.c
@@ -3,6 +3,7 @@
 
 int main(int argc, char *argv[])
 {
+       (void)argc;
 #ifdef FAIL
 #if !HAVE_BUILTIN_TYPES_COMPATIBLE_P || !HAVE_TYPEOF
 #error We need typeof to check isalpha.
@@ -15,8 +16,7 @@ int main(int argc, char *argv[])
 
 #ifdef FAIL
        /* Fake fail on unsigned char platforms. */
-       c = 255;
-       BUILD_ASSERT(c < 0);
+       BUILD_ASSERT((char)255 < 0);
 #endif
 
        return isalpha(c);