getopt: fix optional argument processing

[musl] / include / stddef.h

diff --git a/include/stddef.h b/include/stddef.h
index dbf5a4a..bd75385 100644 (file)
--- a/include/stddef.h
+++ b/include/stddef.h
@@ -1,9 +1,8 @@
 #ifndef _STDDEF_H
 #define _STDDEF_H
 
-#undef NULL
 #ifdef __cplusplus
-#define NULL 0
+#define NULL 0L
 #else
 #define NULL ((void*)0)
 #endif
@@ -11,9 +10,16 @@
 #define __NEED_ptrdiff_t
 #define __NEED_size_t
 #define __NEED_wchar_t
+#if __STDC_VERSION__ >= 201112L || __cplusplus >= 201103L
+#define __NEED_max_align_t
+#endif
 
 #include <bits/alltypes.h>
 
+#if __GNUC__ > 3
+#define offsetof(type, member) __builtin_offsetof(type, member)
+#else
 #define offsetof(type, member) ((size_t)( (char *)&(((type *)0)->member) - (char *)0 ))
+#endif
 
 #endif