include: Add macro for unused arguments and variables

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/ConfigureChecks.cmake b/ConfigureChecks.cmake
index c549d8fc..d4e9f105 100644
--- a/ConfigureChecks.cmake
+++ b/ConfigureChecks.cmake
@@ -344,6 +344,26 @@ int main(void) {
 }" HAVE_FALLTHROUGH_ATTRIBUTE)
 
 check_c_source_compiles("
+#define __unused __attribute__((unused))
+
+static int do_nothing(int i __unused)
+{
+    return 0;
+}
+
+int main(void)
+{
+    int i;
+
+    i = do_nothing(5);
+    if (i > 5) {
+        return 1;
+    }
+
+    return 0;
+}" HAVE_UNUSED_ATTRIBUTE)
+
+check_c_source_compiles("
 #include <string.h>
 
 int main(void)