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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
])
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