dnl @synopsis AX_CXX_HAVE_ISFINITE

dnl

dnl If isfinite() is available to the C++ compiler:

dnl   define HAVE_ISFINITE

dnl   add "-lm" to LIBS

dnl

AC_DEFUN([AX_CXX_HAVE_ISFINITE],

  [ax_cxx_have_isfinite_save_LIBS=$LIBS

   LIBS="$LIBS -lm"

   AC_CACHE_CHECK(for isfinite, ax_cv_cxx_have_isfinite,

    [AC_LANG_SAVE

     AC_LANG_CPLUSPLUS

     AC_LINK_IFELSE(

       [AC_LANG_PROGRAM(

         [[#include <math.h>]],

         [[int f = isfinite( 3 );]])],

       [ax_cv_cxx_have_isfinite=yes],

       [ax_cv_cxx_have_isfinite=no])

     AC_LANG_RESTORE])

   if test "$ax_cv_cxx_have_isfinite" = yes; then

     AC_DEFINE([HAVE_ISFINITE],1,[define if compiler has isfinite])

   else

     LIBS=$ax_cxx_have_isfinite_save_LIBS

   fi

])