dnl @synopsis AC_C99_FUNC_LRINTF dnl dnl Check whether C99's lrintf function is available. dnl @version 1.1 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([AC_C99_FUNC_LRINTF], [AC_CACHE_CHECK(for lrintf, ac_cv_c99_lrintf, [AC_TRY_LINK([ #define _ISOC9X_SOURCE 1 #define _ISOC99_SOURCE 1 #define __USE_ISOC99 1 #define __USE_ISOC9X 1 #include <math.h>], [ int value = lrintf (0.432) ; ], ac_cv_c99_lrintf=yes, ac_cv_c99_lrintf=no)]) if test $ac_cv_c99_lrintf = yes; then AC_DEFINE(HAVE_LRINTF, 1, [Define if you have C99's lrintf function.]) fi ])# AC_C99_LRINTF