----- Original Message -----
From: "chm"
I looked at the proj_api.h and projects.h files
from proj-4.6.1 (which is the version I have on
this cygwin system) and proj-4.8.0. It appears
there is the introduction of a new projCtx which
appears to be some sort of per-thread context.
Yes - but that only comes into play if projects.h is included - which is the
very reason we need to *not* include projects.h.
The projCtx stuff is defined in the 4.8.0 projects.h file, but that file is
now for *internal* (private) use only and doesn't get installed. So any
attempt that the user makes to "#include <projects.h>" in his code will
either fail to find projects.h, or it will find the pre-existing 4.7.0 (or
earlier) version of projects.h. And those earlier versions of projects.h do
*not* define these symbols - hence errors result.
I don't have time to see when the new API was
introduced but I think fixing PDL::GIS::Proj for
4.8.0 will be more than just a quick band aid fix.
See the "add missing projects.h" thread at:
http://lists.maptools.org/pipermail/proj/2012-March/subject.html
That explains pretty much what is going on - and gives the impression that
our task should be fairly trivial.
I'll re-build and re-install 4.7.0 so I can see for myself what's happening
re my amendments to Proj.pd.
Cheers,
Rob
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