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For code maintainability, it is better to have a single definition of the constant than many ones dispatched in many places. In addition, we try to count on the constant M_PI that can be defined by the header <math.h> if possible because it may have the best accuracy for the platform. Signed-off-by: Christophe CURIS <christophe.curis@free.fr>
54 lines
2.1 KiB
Plaintext
54 lines
2.1 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_CACHE_CHECK([if M_PI is defined in math.h], [wm_cv_libm_pi],
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[wm_cv_libm_pi="no"
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wm_save_CFLAGS="$CFLAGS"
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for wm_arg in dnl
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"% yes" dnl natively available (Unix98 compliant?)
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"-D_XOPEN_SOURCE=500" ; dnl Explicit request
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do
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AS_IF([wm_fn_lib_try_compile "math.h" "double val;" "val = M_PI" dnl
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"`echo "$wm_arg" | sed -e 's, *%.*$,,' `"],
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[wm_cv_libm_pi="`echo "$wm_arg" | sed -e 's,^.*% *,,' `" ; break])
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done
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CFLAGS="$wm_save_CFLAGS"])
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AS_IF([test "x$wm_cv_libm_pi" = "xno"],
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[AC_DEFINE([WM_PI], [(3.14159265358979323846)],
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[Defines how to access the value of Pi])],
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[AC_DEFINE([WM_PI], [(M_PI)],
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[Defines how to access the value of Pi])
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AS_IF([test "x$wm_cv_libm_pi" != "xyes"],
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[CFLAGS="$CFLAGS $wm_cv_libm_pi"]) ])
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AC_SUBST(LIBM) dnl
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])
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