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add __DECONST()

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This commit is contained in:
christos 2004-06-30 13:57:32 +00:00
parent 3e36df0496
commit c7f7436fef
1 changed files with 12 additions and 1 deletions
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13
sys/sys/cdefs.h
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@ -1,4 +1,4 @@
/* $NetBSD: cdefs.h,v 1.53 2004/06/11 07:11:00 he Exp $ */ /* $NetBSD: cdefs.h,v 1.54 2004/06/30 13:57:32 christos Exp $ */
/* /*
* Copyright (c) 1991, 1993 * Copyright (c) 1991, 1993
@ -135,6 +135,17 @@
#define __aconst #define __aconst
#endif #endif
/*
* The following macro is used to remove const cast-away warnings
* from gcc -Wcast-qual; it should be used with caution because it
* can hide valid errors; in particular most valid uses are in
* situations where the API requires it, not to cast away string
* constants. We don't use intptr_t on purpose here and we are
* explicit about unsigned long so that we don't have additional
* dependencies.
*/
#define __DECONST(a) ((void *)(unsigned long)(const void *)(a))
/* /*
* GCC2 provides __extension__ to suppress warnings for various GNU C * GCC2 provides __extension__ to suppress warnings for various GNU C
* language extensions under "-ansi -pedantic". * language extensions under "-ansi -pedantic".