mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-21 01:12:26 +08:00
76 lines
2.8 KiB
C
76 lines
2.8 KiB
C
/* ABI compatibility for lgamma functions.
|
|
Copyright (C) 2015-2023 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef LGAMMA_COMPAT_H
|
|
#define LGAMMA_COMPAT_H 1
|
|
|
|
#include <math-svid-compat.h>
|
|
#include <shlib-compat.h>
|
|
|
|
/* XSI POSIX requires lgamma to set signgam, but ISO C does not permit
|
|
this. Namespace issues can be avoided if the functions set
|
|
__signgam and signgam is a weak alias, but this only works if both
|
|
signgam and __signgam were exported from the glibc version the
|
|
program was linked against. Before glibc 2.23, lgamma functions
|
|
set signgam which was not a weak alias for __signgam, so old
|
|
binaries have dynamic symbols for signgam only and the versions of
|
|
lgamma used for old binaries must set both signgam and __signgam.
|
|
Those versions also do a check of _LIB_VERSION != _ISOC_ to match
|
|
old glibc.
|
|
|
|
Users of this file define USE_AS_COMPAT to 0 when building the main
|
|
version of lgamma, 1 when building the compatibility version. */
|
|
|
|
#define LGAMMA_OLD_VER GLIBC_2_0
|
|
#define LGAMMA_NEW_VER GLIBC_2_23
|
|
#define HAVE_LGAMMA_COMPAT SHLIB_COMPAT (libm, LGAMMA_OLD_VER, LGAMMA_NEW_VER)
|
|
|
|
/* Whether to build this version at all. */
|
|
#define BUILD_LGAMMA \
|
|
(LIBM_SVID_COMPAT && (HAVE_LGAMMA_COMPAT || !USE_AS_COMPAT))
|
|
|
|
/* The name to use for this version. */
|
|
#if USE_AS_COMPAT
|
|
# define LGFUNC(FUNC) FUNC ## _compat
|
|
#else
|
|
# define LGFUNC(FUNC) FUNC
|
|
#endif
|
|
|
|
/* If there is a compatibility version, gamma (not an ISO C function,
|
|
so never a problem for it to set signgam) points directly to it
|
|
rather than having separate versions. */
|
|
#define GAMMA_ALIAS (USE_AS_COMPAT ? HAVE_LGAMMA_COMPAT : !HAVE_LGAMMA_COMPAT)
|
|
|
|
/* How to call the underlying lgamma_r function. */
|
|
#define CALL_LGAMMA(TYPE, FUNC, ARG) \
|
|
({ \
|
|
TYPE lgamma_tmp; \
|
|
int local_signgam; \
|
|
if (USE_AS_COMPAT) \
|
|
{ \
|
|
lgamma_tmp = FUNC ((ARG), &local_signgam); \
|
|
if (_LIB_VERSION != _ISOC_) \
|
|
signgam = __signgam = local_signgam; \
|
|
} \
|
|
else \
|
|
lgamma_tmp = FUNC ((ARG), &__signgam); \
|
|
lgamma_tmp; \
|
|
})
|
|
|
|
#endif /* lgamma-compat.h. */
|