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95ee539d6d
Compilation will not work if the header is missing, so make sure it is present and compilable first. This can highligh sooner if a user forgot to install the corresponding dev package. Signed-off-by: Christophe CURIS <christophe.curis@free.fr>
35 lines
1.3 KiB
Plaintext
35 lines
1.3 KiB
Plaintext
# wm_libmath.m4 - Macros to check proper libMath usage for WINGs
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#
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# Copyright (c) 2013 Christophe Curis
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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# WM_CHECK_LIBM
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# -------------
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#
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# Checks the needed library link flags needed to have math lib
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# Sets variable LIBM with the appropriates flags
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AC_DEFUN_ONCE([WM_CHECK_LIBM],
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[AC_CHECK_HEADER([math.h], [],
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[AC_MSG_ERROR([header for math library not found])])
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AC_CHECK_FUNC(atan,
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[LIBM=],
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[AC_CHECK_LIB(m, [atan],
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[LIBM=-lm],
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[AC_MSG_WARN(Could not find Math library, you may experience problems)
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LIBM=] )] ) dnl
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AC_SUBST(LIBM) dnl
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])
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