mirror of https://github.com/xiph/flac
56 lines
2.1 KiB
Plaintext
56 lines
2.1 KiB
Plaintext
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dnl Copyright (C) 2012 Xiph.org Foundation
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dnl
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dnl Redistribution and use in source and binary forms, with or without
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dnl modification, are permitted provided that the following conditions
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dnl are met:
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dnl
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dnl - Redistributions of source code must retain the above copyright
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dnl notice, this list of conditions and the following disclaimer.
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dnl
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dnl - Redistributions in binary form must reproduce the above copyright
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dnl notice, this list of conditions and the following disclaimer in the
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dnl documentation and/or other materials provided with the distribution.
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dnl
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dnl - Neither the name of the Xiph.org Foundation nor the names of its
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dnl contributors may be used to endorse or promote products derived from
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dnl this software without specific prior written permission.
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dnl
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dnl THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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dnl ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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dnl LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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dnl A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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dnl CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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dnl EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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dnl PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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dnl PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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dnl LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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dnl NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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dnl SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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dnl @synopsis XIPH_C_BSWAP32
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dnl
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dnl @author Erik de Castro Lopo <erikd@mega-nerd.com>
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dnl
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dnl Dtermine whether the compiler has the __builtin_bswap32() intrinsic which
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dnl is likely to be present for most versions of GCC as well as Clang.
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AC_DEFUN([XIPH_C_BSWAP32],
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[AC_CACHE_CHECK(has bswap32 instrinsic,
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ac_cv_c_bswap,
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# Initialize to no
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ac_cv_c_bswap=no
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HAVE_BSWAP32=0
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[AC_TRY_LINK([],
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return __builtin_bswap32 (0) ;,
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ac_cv_c_bswap=yes
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HAVE_BSWAP32=1
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)]
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AC_DEFINE_UNQUOTED(HAVE_BSWAP32, ${HAVE_BSWAP32},
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[Compiler has the __builtin_bswap32 intrinsic])
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)]
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)# XIPH_C_BSWAP32
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