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https://github.com/FAUSheppy/colorredstderr-mirror
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54 lines
1.9 KiB
C
54 lines
1.9 KiB
C
/*
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* Compiler specific macros.
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*
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* Copyright (C) 2013-2015 Simon Ruderich
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef COMPILER_H
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#define COMPILER_H 1
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#ifdef HAVE___ATTRIBUTE__
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/* Prevent/force inlining. Used to improve performance. */
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# define noinline __attribute__((noinline))
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# define always_inline __attribute__((always_inline))
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/* Unused parameter. */
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# define unused __attribute__((unused))
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/* Mark the function protected, which means it can't be overwritten by other
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* modules (libraries), e.g. with LD_PRELOAD); otherwise same as the default
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* visibility. This causes the compiler not use the PLT (and no relocations)
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* for local calls from inside this module; but the symbols are still
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* exported. This is faster and in this case prevents useless lookups as we
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* hook those functions and nobody else should modify them. Not strictly
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* necessary, but nice to have. */
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# define visibility_protected __attribute__((visibility("protected")))
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#else
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# define noinline
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# define always_inline
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# define unused
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# define visibility_protected
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#endif
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/* Branch prediction information for the compiler. */
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#ifdef HAVE___BUILTIN_EXPECT
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# define likely(x) __builtin_expect(!!(x), 1)
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# define unlikely(x) __builtin_expect(!!(x), 0)
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#else
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# define likely(x) x
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# define unlikely(x) x
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#endif
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#endif
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