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76 lines
2.8 KiB
C
76 lines
2.8 KiB
C
/* ABI compatibility for lgamma functions.
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Copyright (C) 2015-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef LGAMMA_COMPAT_H
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#define LGAMMA_COMPAT_H 1
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#include <math-svid-compat.h>
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#include <shlib-compat.h>
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/* XSI POSIX requires lgamma to set signgam, but ISO C does not permit
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this. Namespace issues can be avoided if the functions set
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__signgam and signgam is a weak alias, but this only works if both
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signgam and __signgam were exported from the glibc version the
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program was linked against. Before glibc 2.23, lgamma functions
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set signgam which was not a weak alias for __signgam, so old
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binaries have dynamic symbols for signgam only and the versions of
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lgamma used for old binaries must set both signgam and __signgam.
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Those versions also do a check of _LIB_VERSION != _ISOC_ to match
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old glibc.
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Users of this file define USE_AS_COMPAT to 0 when building the main
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version of lgamma, 1 when building the compatibility version. */
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#define LGAMMA_OLD_VER GLIBC_2_0
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#define LGAMMA_NEW_VER GLIBC_2_23
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#define HAVE_LGAMMA_COMPAT SHLIB_COMPAT (libm, LGAMMA_OLD_VER, LGAMMA_NEW_VER)
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/* Whether to build this version at all. */
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#define BUILD_LGAMMA \
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(LIBM_SVID_COMPAT && (HAVE_LGAMMA_COMPAT || !USE_AS_COMPAT))
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/* The name to use for this version. */
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#if USE_AS_COMPAT
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# define LGFUNC(FUNC) FUNC ## _compat
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#else
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# define LGFUNC(FUNC) FUNC
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#endif
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/* If there is a compatibility version, gamma (not an ISO C function,
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so never a problem for it to set signgam) points directly to it
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rather than having separate versions. */
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#define GAMMA_ALIAS (USE_AS_COMPAT ? HAVE_LGAMMA_COMPAT : !HAVE_LGAMMA_COMPAT)
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/* How to call the underlying lgamma_r function. */
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#define CALL_LGAMMA(TYPE, FUNC, ARG) \
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({ \
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TYPE lgamma_tmp; \
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int local_signgam; \
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if (USE_AS_COMPAT) \
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{ \
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lgamma_tmp = FUNC ((ARG), &local_signgam); \
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if (_LIB_VERSION != _ISOC_) \
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signgam = __signgam = local_signgam; \
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} \
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else \
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lgamma_tmp = FUNC ((ARG), &__signgam); \
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lgamma_tmp; \
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})
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#endif /* lgamma-compat.h. */
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