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1 dnl @synopsis MN_C99_FUNC_LRINT
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2 dnl
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3 dnl Check whether C99's lrint function is available.
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4 dnl @version 1.3 Feb 12 2002
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5 dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com>
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6 dnl
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7 dnl Permission to use, copy, modify, distribute, and sell this file for any
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8 dnl purpose is hereby granted without fee, provided that the above copyright
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9 dnl and this permission notice appear in all copies. No representations are
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10 dnl made about the suitability of this software for any purpose. It is
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11 dnl provided "as is" without express or implied warranty.
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12 dnl
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13 AC_DEFUN([MN_C99_FUNC_LRINT],
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14 [AC_CACHE_CHECK(for lrint,
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15 ac_cv_c99_lrint,
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16 [
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17 lrint_save_CFLAGS=$CFLAGS
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18 CFLAGS="-lm"
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19 AC_TRY_LINK([
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20 #define _ISOC9X_SOURCE 1
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21 #define _ISOC99_SOURCE 1
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22 #define __USE_ISOC99 1
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23 #define __USE_ISOC9X 1
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24
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25 #include <math.h>
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26 ], if (!lrint(3.14159)) lrint(2.7183);, ac_cv_c99_lrint=yes, ac_cv_c99_lrint=no)
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27
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28 CFLAGS=$lrint_save_CFLAGS
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29
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30 ])
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31
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32 if test "$ac_cv_c99_lrint" = yes; then
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33 AC_DEFINE(HAVE_LRINT, 1,
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34 [Define if you have C99's lrint function.])
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35 fi
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36 ])# MN_C99_FUNC_LRINT
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37
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