minmax: New module, safe min and max macros

[ccan] / ccan / minmax / test / compile_fail-wrongsign.c

diff --git a/ccan/minmax/test/compile_fail-wrongsign.c b/ccan/minmax/test/compile_fail-wrongsign.c
new file mode 100644 (file)
index 0000000..6aeaf1c
--- /dev/null
+++ b/ccan/minmax/test/compile_fail-wrongsign.c
@@ -0,0 +1,19 @@
+#include <ccan/minmax/minmax.h>
+
+static int function(void)
+{
+#ifdef FAIL
+       return min(1, 1U);
+#if !HAVE_TYPEOF||!HAVE_BUILTIN_CHOOSE_EXPR||!HAVE_BUILTIN_TYPES_COMPATIBLE_P
+#error "Unfortunately we don't fail if the typechecks are noops."
+#endif
+#else
+       return 0;
+#endif
+}
+
+int main(int argc, char *argv[])
+{
+       function();
+       return 0;
+}