interpretor/libsndfile-1.0.25/M4/lrint.m4

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