test: Add a testcase for atomic helpers

test/atomic-helpers.c

@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2023 Martin Storsjo
+ *
+ * This file is part of llvm-mingw.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <stdatomic.h>
+
+struct large {
+    int data[20];
+};
+
+typedef struct large type;
+
+_Atomic type value;
+
+type get(void) {
+    return atomic_load(&value);
+}
+
+type myValue;
+
+int lockfree;
+
+int main(int argc, char* argv[]) {
+    myValue = get();
+    lockfree = atomic_is_lock_free(&value);
+    return 0;
+}