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We are relying more and more on C99 math functions. On C89 systems where
those functions are not available our own custom versions of those
functions are used instead. So far these has been spread across the code
base. This commit gathers them in the same file and introduces the
proj_math.h header. The build system checks for C99 math functions. If
not found the proj_math.h header make sure that C99 functions are
defined as their pj_ equivalent.
Ideally proj_math.h is included instead of math.h. This removes the need
for any checks against HAVE_C99_MATH in the code making it easier to
read.
For this commit the functions hypot, log1p and asinh has been taken care
of.
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* change suspicious loop exit condition in nad_cvt
* touch up nad_cvt.c
* ...and remove tabs
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facto standard M_PI and its ilk. Change names that are widely used in the project to be in the M_ namespace, so HALFPI becomes M_HALFPI. HALFPI is #defined as M_PI_2 (the defacto standard name). #defines _USE_MATH_DEFINES for MS Visual Studio (I didn't personally test this part, but Appveyor will not build otherwise).
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git-svn-id: http://svn.osgeo.org/metacrs/proj/trunk@1515 4e78687f-474d-0410-85f9-8d5e500ac6b2
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adjlon(). Otherwise worldsized grids will fail over half their domain.
ie. cs2cs +proj=latlong +datum=WGS84 +to +proj=latlong +nadgrids=null < "10 5"
git-svn-id: http://svn.osgeo.org/metacrs/proj/trunk@1267 4e78687f-474d-0410-85f9-8d5e500ac6b2
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grid then the first approximation of the correction is accepted. See
comments inline about the change. This isn't really the "correct" solution.
git-svn-id: http://svn.osgeo.org/metacrs/proj/trunk@1127 4e78687f-474d-0410-85f9-8d5e500ac6b2
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git-svn-id: http://svn.osgeo.org/metacrs/proj/trunk@776 4e78687f-474d-0410-85f9-8d5e500ac6b2
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