| /* ABI compatibility for lgamma functions. |
| Copyright (C) 2015-2018 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 |
| <http://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. */ |