[gdal-dev] Re: GDAL 1.5.0 Perl Binding on Cygwin

[Paul Mallas]

I fixed this problem by editing a Cygwin script /usr/bin/perlld from:

my $CC = 'gcc';
to:
my $CC = 'g++';

This seems to fix other perl problems (non-GDAL) with Cygwin as well. 
When I pointed this out, the Cygwin folks thought it was a bug but 
wanted to investigate why this was set to gcc in the first place.

Anyway, my problem remains with perl swig bindings on Cygwin. I know Ari 
wants nothing more to do with this issue, but since we're on the 
subject, maybe someone else might able to give me a clue.

It seems I have a problem linking with the gdal lib with external libs. 
  I get a ton of these types of messages below - I think the issue has 
to do with the beginning underscore in the calls because rikdataset.cpp 
calls "uncompress" not "_uncompress":

/usr/local/lib/libgdal.a(rikdataset.o):rikdataset.cpp:(.text+0x519): 
undefined reference to `_uncompress'
/usr/local/lib/libgdal.a(jpeg2000dataset.o): In function 
`_ZN18JPEG2000RasterBandC2EP15JPEG2000Datasetiii':
/home/pmallas/gdal/frmts/jpeg2000/jpeg2000dataset.cpp:257: undefined 
reference to `_jas_matrix_create'
....

I am ignorant of how libraries get called - probably the windows demands 
a prepended underscore for library calls or something. And I know there 
are flags to manipulate leading underscores with g++ (like 
-fleading-underscore), but I could never get them to work. I have spent 
considerable time trying to sort this out with no luck.

Any insights would be appreciated.

jingmuyang at aol.com wrote:
> I have successfully built GDAL 1.5.0 Perl binding on Cygwin and the 
> followings might be helpful for those who experience problems.
> 
> 1. Go to directory gdal-1.5.0/swig/perl and run 'perl Makefile.PL'.  The 
> following four Makefiles should be created if it succeeds:
> 
> Makefile_Geo__GDAL
> Makefile_Geo__GDAL__Const
> Makefile_Geo__OGR
> Makefile_Geo__OSR
> 
> 2. Edit each of the four Makefiles by appending -lstdc++ after each 
> -lgdal and save them.
> 
> 3. Run make using each of the four Makefiles as follows:
> 
> make -f Makefile_Geo__GDAL
> make -f Makefile_Geo__GDAL__Const
> make -f Makefile_Geo__OGR
> make -f Makefile_Geo__OSR
> 
> 4. Install the Perl Geo::GDAL package by running
> 
> make -f Makefile_Geo__GDAL install
> 
> That it.  Enjoy!
> 
> Jim
> 
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