# wm_libmath.m4 - Macros to check proper libMath usage for WINGs
#
# Copyright (c) 2013 Christophe Curis
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

# WM_CHECK_LIBM
# -------------
#
# Checks the needed library link flags needed to have math lib
# Sets variable LIBM with the appropriates flags
AC_DEFUN_ONCE([WM_CHECK_LIBM],
[AC_CHECK_HEADER([math.h], [],
                 [AC_MSG_ERROR([header for math library not found])])
AC_CHECK_FUNC(atan,
    [LIBM=],
    [AC_CHECK_LIB(m, [atan],
        [LIBM=-lm],
        [AC_MSG_WARN(Could not find Math library, you may experience problems)
         LIBM=] )] ) dnl
AC_SUBST(LIBM) dnl
])