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dnl @synopsis MN_C99_FUNC_LRINT
dnl
dnl Check whether C99's lrint function is available.
dnl @version 1.3	Feb 12 2002
dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com>
dnl
dnl Permission to use, copy, modify, distribute, and sell this file for any
dnl purpose is hereby granted without fee, provided that the above copyright
dnl and this permission notice appear in all copies.  No representations are
dnl made about the suitability of this software for any purpose.  It is
dnl provided "as is" without express or implied warranty.
dnl
AC_DEFUN([MN_C99_FUNC_LRINT],
[AC_CACHE_CHECK(for lrint,
  ac_cv_c99_lrint,
[
lrint_save_CFLAGS=$CFLAGS
CFLAGS="-lm"
AC_TRY_LINK([
#define		_ISOC9X_SOURCE	1
#define 	_ISOC99_SOURCE	1
#define		__USE_ISOC99	1
#define 	__USE_ISOC9X	1

#include <math.h>
], if (!lrint(3.14159)) lrint(2.7183);, ac_cv_c99_lrint=yes, ac_cv_c99_lrint=no)

CFLAGS=$lrint_save_CFLAGS

])

if test "$ac_cv_c99_lrint" = yes; then
  AC_DEFINE(HAVE_LRINT, 1,
            [Define if you have C99's lrint function.])
fi
])# MN_C99_FUNC_LRINT
author	Chris Cannam <cannam@all-day-breakfast.com>
date	Mon, 22 May 2017 18:56:49 +0100
parents	cd6cdf86811e
children