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a little safer impl of __UNCONST, using __typeof__ if __GNUC__.

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yamt 2004-09-23 17:40:16 +00:00
parent 29be49b448
commit 139aa9db9e
1 changed files with 5 additions and 1 deletions
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6
sys/sys/cdefs.h
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@ -1,4 +1,4 @@
/* $NetBSD: cdefs.h,v 1.55 2004/07/01 19:05:12 christos Exp $ */
/* $NetBSD: cdefs.h,v 1.56 2004/09/23 17:40:16 yamt Exp $ */
/*
* Copyright (c) 1991, 1993
@ -144,7 +144,11 @@
* explicit about unsigned long so that we don't have additional
* dependencies.
*/
#ifdef __GNUC__
#define __UNCONST(p) ((__typeof__(*(p)) *)(unsigned long)p)
#else
#define __UNCONST(a) ((void *)(unsigned long)(const void *)(a))
#endif
/*
* GCC2 provides __extension__ to suppress warnings for various GNU C