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replaced all local definitions of PI by a single one

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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>
This commit is contained in:
Christophe CURIS
2014-12-08 22:42:36 +01:00
committed by Carlos R. Mafra
parent 723f217355
commit 4799df5506
5 changed files with 34 additions and 27 deletions
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19
m4/wm_libmath.m4
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@@ -30,5 +30,24 @@ AC_CHECK_FUNC(atan,
[LIBM=-lm],
[AC_MSG_WARN(Could not find Math library, you may experience problems)
LIBM=] )] ) dnl
AC_CACHE_CHECK([if M_PI is defined in math.h], [wm_cv_libm_pi],
[wm_cv_libm_pi="no"
wm_save_CFLAGS="$CFLAGS"
for wm_arg in dnl
"% yes" dnl natively available (Unix98 compliant?)
"-D_XOPEN_SOURCE=500" ; dnl Explicit request
do
AS_IF([wm_fn_lib_try_compile "math.h" "double val;" "val = M_PI" dnl
"`echo "$wm_arg" | sed -e 's, *%.*$,,' `"],
[wm_cv_libm_pi="`echo "$wm_arg" | sed -e 's,^.*% *,,' `" ; break])
done
CFLAGS="$wm_save_CFLAGS"])
AS_IF([test "x$wm_cv_libm_pi" = "xno"],
[AC_DEFINE([WM_PI], [(3.14159265358979323846)],
[Defines how to access the value of Pi])],
[AC_DEFINE([WM_PI], [(M_PI)],
[Defines how to access the value of Pi])
AS_IF([test "x$wm_cv_libm_pi" != "xyes"],
[CFLAGS="$CFLAGS $wm_cv_libm_pi"]) ])
AC_SUBST(LIBM) dnl
])