/usr/include/openlibm/bsd_cdefs.h is in libopenlibm-dev 0.5.0+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Berkeley Software Design, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)cdefs.h 8.8 (Berkeley) 1/9/95
* $FreeBSD: src/sys/sys/cdefs.h,v 1.114 2011/02/18 21:44:53 nwhitehorn Exp $
*/
/* Do not redefine macros if the system provides them in sys/cdefs.h.
* The two macros correspond to different platforms. */
#ifndef _BSD_CDEFS_H_
#define _BSD_CDEFS_H_
/*
* This code has been put in place to help reduce the addition of
* compiler specific defines in FreeBSD code. It helps to aid in
* having a compiler-agnostic source tree.
*/
#if defined(__GNUC__) || defined(__INTEL_COMPILER)
#if __GNUC__ >= 3 || defined(__INTEL_COMPILER)
#define __GNUCLIKE_ASM 3
#else
#define __GNUCLIKE_ASM 2
#endif
#define __CC_SUPPORTS___INLINE__ 1
#endif /* __GNUC__ || __INTEL_COMPILER */
#if defined(__STDC__) || defined(__cplusplus)
#define __volatile volatile
#if defined(__cplusplus)
#define __inline inline /* convert to C++ keyword */
#else
#if !defined(__CC_SUPPORTS___INLINE)
#define __inline /* delete GCC keyword */
#endif /* ! __CC_SUPPORTS___INLINE */
#endif /* !__cplusplus */
#else /* !(__STDC__ || __cplusplus) */
#if !defined(__CC_SUPPORTS___INLINE)
#define __inline
#define __volatile
#endif /* !__CC_SUPPORTS___INLINE */
#endif /* !(__STDC__ || __cplusplus) */
/*
* Macro to test if we're using a specific version of gcc or later.
*/
#if defined(__GNUC__) && !defined(__INTEL_COMPILER)
#define __GNUC_PREREQ__(ma, mi) \
(__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
#else
#define __GNUC_PREREQ__(ma, mi) 0
#endif
/*
* Compiler-dependent macro to help declare pure (no side effects) functions.
* It is null except for versions of gcc that are known to support the features
* properly (old versions of gcc-2 supported the dead and pure features
* in a different (wrong) way), and for icc. If we do not provide an implementation
* for a given compiler, let the compile fail if it is told to use
* a feature that we cannot live without.
*/
#if !defined(__pure2) && (__GNUC_PREREQ__(2, 7) || defined(__INTEL_COMPILER))
#define __pure2 __attribute__((__const__))
#endif
#endif /* !_BSD_CDEFS_H_ */
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