clang doesn't like mode_t type as an argument to va_arg(): error: second argument to 'va_arg' is of promotable type 'mode_t' (aka 'unsigned short'); this va_arg has undefined behavior because arguments will be promoted to 'int' mode = va_arg(ap, mode_t); ^~~~~~ Signed-off-by: Jiri Denemark <jdenemar(a)redhat.com&gt; --- Pushed as a build-breaker. tests/virfilewrapper.c | 2 +- tests/virusbmock.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/tests/virfilewrapper.c b/tests/virfilewrapper.c index 1d1d182708..3fd7f7aa8f 100644 --- a/tests/virfilewrapper.c +++ b/tests/virfilewrapper.c @@ -267,7 +267,7 @@ int open(const char *path, int flags, ...) */ if (flags & O_CREAT) { va_start(ap, flags); - mode = va_arg(ap, mode_t); + mode = (mode_t) va_arg(ap, int); va_end(ap); } diff --git a/tests/virusbmock.c b/tests/virusbmock.c index f430a2edad..12083e2362 100644 --- a/tests/virusbmock.c +++ b/tests/virusbmock.c @@ -101,7 +101,7 @@ int open(const char *pathname, int flags, ...) */ if (flags & O_CREAT) { va_start(ap, flags); - mode = va_arg(ap, mode_t); + mode = (mode_t) va_arg(ap, int); va_end(ap); } -- 2.14.2