| 1 | /* ABI compatibility for lgamma functions. |
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| 2 | Copyright (C) 2015-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #ifndef LGAMMA_COMPAT_H |
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| 20 | #define LGAMMA_COMPAT_H 1 |
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| 21 | |
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| 22 | #include <math-svid-compat.h> |
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| 23 | #include <shlib-compat.h> |
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| 24 | |
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| 25 | /* XSI POSIX requires lgamma to set signgam, but ISO C does not permit |
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| 26 | this. Namespace issues can be avoided if the functions set |
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| 27 | __signgam and signgam is a weak alias, but this only works if both |
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| 28 | signgam and __signgam were exported from the glibc version the |
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| 29 | program was linked against. Before glibc 2.23, lgamma functions |
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| 30 | set signgam which was not a weak alias for __signgam, so old |
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| 31 | binaries have dynamic symbols for signgam only and the versions of |
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| 32 | lgamma used for old binaries must set both signgam and __signgam. |
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| 33 | Those versions also do a check of _LIB_VERSION != _ISOC_ to match |
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| 34 | old glibc. |
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| 35 | |
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| 36 | Users of this file define USE_AS_COMPAT to 0 when building the main |
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| 37 | version of lgamma, 1 when building the compatibility version. */ |
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| 38 | |
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| 39 | #define LGAMMA_OLD_VER GLIBC_2_0 |
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| 40 | #define LGAMMA_NEW_VER GLIBC_2_23 |
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| 41 | #define HAVE_LGAMMA_COMPAT SHLIB_COMPAT (libm, LGAMMA_OLD_VER, LGAMMA_NEW_VER) |
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| 42 | |
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| 43 | /* Whether to build this version at all. */ |
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| 44 | #define BUILD_LGAMMA \ |
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| 45 | (LIBM_SVID_COMPAT && (HAVE_LGAMMA_COMPAT || !USE_AS_COMPAT)) |
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| 46 | |
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| 47 | /* The name to use for this version. */ |
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| 48 | #if USE_AS_COMPAT |
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| 49 | # define LGFUNC(FUNC) FUNC ## _compat |
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| 50 | #else |
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| 51 | # define LGFUNC(FUNC) FUNC |
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| 52 | #endif |
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| 53 | |
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| 54 | /* If there is a compatibility version, gamma (not an ISO C function, |
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| 55 | so never a problem for it to set signgam) points directly to it |
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| 56 | rather than having separate versions. */ |
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| 57 | #define GAMMA_ALIAS (USE_AS_COMPAT ? HAVE_LGAMMA_COMPAT : !HAVE_LGAMMA_COMPAT) |
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| 58 | |
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| 59 | /* How to call the underlying lgamma_r function. */ |
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| 60 | #define CALL_LGAMMA(TYPE, FUNC, ARG) \ |
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| 61 | ({ \ |
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| 62 | TYPE lgamma_tmp; \ |
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| 63 | int local_signgam; \ |
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| 64 | if (USE_AS_COMPAT) \ |
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| 65 | { \ |
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| 66 | lgamma_tmp = FUNC ((ARG), &local_signgam); \ |
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| 67 | if (_LIB_VERSION != _ISOC_) \ |
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| 68 | signgam = __signgam = local_signgam; \ |
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| 69 | } \ |
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| 70 | else \ |
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| 71 | lgamma_tmp = FUNC ((ARG), &__signgam); \ |
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| 72 | lgamma_tmp; \ |
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| 73 | }) |
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| 74 | |
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| 75 | #endif /* lgamma-compat.h. */ |
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| 76 | |
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