diff --git a/int.h b/int.h
index 3738c0b..19bcfef 100644
--- a/int.h
+++ b/int.h
@@ -21,3 +21,37 @@ typedef uint64_t uintptr_t;
 typedef int32_t  intptr_t;
 typedef uint32_t uintptr_t;
 #endif
+
+// Compile time tests in supported compilers
+#ifdef __SIZEOF_CHAR__
+#if __SIZEOF_CHAR__ != 1
+#error __SIZEOF_CHAR__ is not 1
+#endif
+#endif
+
+#ifdef __SIZEOF_SHORT__
+#if __SIZEOF_SHORT__ != 2
+#error __SIZEOF_SHORT__ is not 2
+#endif
+#endif
+
+#ifdef __SIZEOF_INT__
+#if __SIZEOF_INT__ != 4
+#error __SIZEOF_INT__ is not 4
+#endif
+#endif
+
+#ifdef __SIZEOF_LONG_LONG__
+#if __SIZEOF_LONG_LONG__ != 8
+#error __SIZEOF_LONG_LONG__ is not 8
+#endif
+#endif
+
+#ifdef __SIZEOF_POINTER__
+#if __SIZEOF_POINTER__ != (__WORDSIZE / 8)
+#error __SIZEOF_POINTER__ is not (__WORDSIZE / 8)
+#endif
+#endif
+
+//TODO:
+//#ifdef __SIZEOF_SIZE_T__