--- /dev/null
+#include <stdio.h>
+#include <string.h>
+#include "config.h"
+
+/**
+ * alignof - ALIGNOF() macro to determine alignment of a type.
+ *
+ * Many platforms have requirements that certain types must be aligned
+ * to certain address boundaries, such as ints needing to be on 4-byte
+ * boundaries. Attempting to access variables with incorrect
+ * alignment may cause performance loss or even program failure (eg. a
+ * bus signal).
+ *
+ * There are times which it's useful to be able to programatically
+ * access these requirements, such as for dynamic allocators.
+ *
+ * Example:
+ * #include <stdio.h>
+ * #include "alignof/alignoff.h"
+ *
+ * int main(int argc, char *argv[])
+ * {
+ * char arr[sizeof(int)];
+ *
+ * if ((unsigned long)arr % ALIGNOF(int)) {
+ * printf("arr %p CANNOT hold an int\n", arr);
+ * exit(1);
+ * } else {
+ * printf("arr %p CAN hold an int\n", arr);
+ * exit(0);
+ * }
+ * }
+ */
+int main(int argc, char *argv[])
+{
+ if (argc != 2)
+ return 1;
+
+ if (strcmp(argv[1], "depends") == 0) {
+ printf("ccan/build_assert\n");
+ return 0;
+ }
+
+ return 1;
+}