1 files changed, 7 insertions, 1 deletions
diff --git a/cmake/TestFileOffsetBits.c b/cmake/TestFileOffsetBits.c
index ac0e51e225..882abb4cfc 100644
--- a/cmake/TestFileOffsetBits.c
+++ b/cmake/TestFileOffsetBits.c
@@ -8,11 +8,17 @@
 
 #include <sys/types.h>
 
+/* detect failure even with -Wno-error on command line */
+#pragma GCC diagnostic error "-Werror"
+
 int main(int argc, char **argv)
 {
   /* Cause a compile-time error if off_t is smaller than 64 bits */
 #define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
   int off_t_is_large[ (LARGE_OFF_T % 2147483629 == 721 && LARGE_OFF_T % 2147483647 == 1) ? 1 : -1 ];
+  /* silence unused errors */
+  (void)off_t_is_large;
+  (void)argc;
+  (void)argv;
   return 0;
 }
-