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/* ignore a function return without a compiler warning
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Copyright (C) 2008-2010 Free Software Foundation, Inc.
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Copyright (C) 2008-2011 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Written by Jim Meyering. */
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/* Written by Jim Meyering, Eric Blake and Pádraig Brady. */
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/* Use these functions to avoid a warning when using a function declared with
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/* Use "ignore_value" to avoid a warning when using a function declared with
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gcc's warn_unused_result attribute, but for which you really do want to
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ignore the result. Traditionally, people have used a "(void)" cast to
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indicate that a function's return value is deliberately unused. However,
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"copy.c:233: warning: ignoring return value of 'fchown',
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declared with attribute warn_unused_result". */
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static inline void ignore_value (int i) { (void) i; }
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static inline void ignore_ptr (void* p) { (void) p; }
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/* FIXME: what about aggregate types? */
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#ifndef _GL_IGNORE_VALUE_H
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# define _GL_IGNORE_VALUE_H
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# ifndef _GL_ATTRIBUTE_DEPRECATED
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/* The __attribute__((__deprecated__)) feature
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is available in gcc versions 3.1 and newer. */
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# if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 1)
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# define _GL_ATTRIBUTE_DEPRECATED /* empty */
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# define _GL_ATTRIBUTE_DEPRECATED __attribute__ ((__deprecated__))
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/* The __attribute__((__warn_unused_result__)) feature
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is available in gcc versions 3.4 and newer,
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while the typeof feature has been available since 2.7 at least. */
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# if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 4)
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# define ignore_value(x) ((void) (x))
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# define ignore_value(x) (({ __typeof__ (x) __x = (x); (void) __x; }))
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/* ignore_value works for scalars, pointers and aggregates;
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deprecate ignore_ptr. */
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static inline void _GL_ATTRIBUTE_DEPRECATED
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ignore_ptr (void *p) { (void) p; } /* deprecated: use ignore_value */
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gltests/ignore-value.h
