1dnl @synopsis AC_C99_FUNC_LRINTF
2dnl
3dnl Check whether C99's lrintf function is available.
4dnl @version 1.1
5dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com>
6dnl
7dnl Permission to use, copy, modify, distribute, and sell this file for any
8dnl purpose is hereby granted without fee, provided that the above copyright
9dnl and this permission notice appear in all copies.  No representations are
10dnl made about the suitability of this software for any purpose.  It is
11dnl provided "as is" without express or implied warranty.
12dnl
13AC_DEFUN([AC_C99_FUNC_LRINTF],
14[AC_CACHE_CHECK(for lrintf,
15  ac_cv_c99_lrintf,
16[AC_TRY_LINK([
17#define		_ISOC9X_SOURCE	1
18#define 	_ISOC99_SOURCE	1
19#define		__USE_ISOC99	1
20#define 	__USE_ISOC9X	1
21#include	<math.h>],
22[	int value = lrintf (0.432) ; ], ac_cv_c99_lrintf=yes, ac_cv_c99_lrintf=no)])
23if test $ac_cv_c99_lrintf = yes; then
24  AC_DEFINE(HAVE_LRINTF, 1,
25            [Define if you have C99's lrintf function.])
26fi
27])# AC_C99_LRINTF
28