[GRASS5] GRASS compilation on cygwin and IRIX

[Glynn Clements]

Andreas Lange wrote:

> Problem is on cygwin:
> my configure line:
> ./configure --prefix=$INST --with-postgres-root=/usr \
> --with-postgres-includes=/usr/include/postgresql \
> --with-postgres-libs=/usr/lib \
> --x-includes=/usr/X11R6/include \
> --x-libraries=/usr/X11R6/lib \
> --with-tcltk-libs=/usr/local/lib \
> --with-tcltk-includes=/usr/local/include \
> --with-gd-libs=/usr/local/lib \
> --with-gd-includes=/usr/local/include \
> --with-png-libs=/lib \
> --with-png-includes=/usr/local/include 

Note: don't specify any directories in which the preprocessor/linker
will look automatically.

I wouldn't have thought it necessary to specify anything other than:

	--with-postgres-includes=/usr/include/postgresql \

The X directories should be determined automatically, and the rest
should be searched automatically.

> sinppet from config.log:
> 
> configure:4546: checking for location of PNG includes
> configure:4578: checking for png.h
> configure:4588: gcc -E  -I/usr/local/include conftest.c >/dev/null
> 2>conftest.out

This indicates that png.h is found.

> configure:4618: checking for location of PNG library
> configure:4647: checking for png_read_png in -lpng
> configure:4666: gcc -o conftest -g -O2    conftest.c -lpng -lz 1>&5

This indicates that libpng is found (and contains png_read_png).

> configure:4696: checking for location of GD includes
> configure:4728: checking for gd.h
> configure:4738: gcc -E  -I/usr/local/include conftest.c >/dev/null
> 2>conftest.out

This indicates that gd.h is found.

> configure:4768: checking for location of GD library
> configure:4797: checking for gdImageCreate in -lgd
> configure:4816: gcc -o conftest -g -O2    conftest.c -lgd   1>&5

This indicates that libgd is found (and contains gdImageCreate).

> configure:4889: checking for gdImageGif
> configure:4917: gcc -o conftest -g -O2    -lgd conftest.c  1>&5
> /cygdrive/c/DOKUME~1/ADMINI~1/LOKALE~1/Temp/ccgn0CNd.o: In function
> `main':
> /home/Administrator/cygwin/extra/grass-5/tmp/grass/configure:4911:
> undefined reference to `gdImageGif'

[snip]

But it doesn't contain gdImageGif ...

> configure:4889: checking for gdImagePng
> configure:4917: gcc -o conftest -g -O2    -lgd conftest.c  1>&5
> /cygdrive/c/DOKUME~1/ADMINI~1/LOKALE~1/Temp/ccqOKwxV.o: In function
> `main':
> /home/Administrator/cygwin/extra/grass-5/tmp/grass/configure:4911:
> undefined reference to `gdImagePng'

[snip]

... or gdImagePng. So what formats does it support?

> First, why is gdImageGif checked? GIF support was officially dropped in
> gd some time ago. 

GRASS doesn't support GIF, but GD does. Some versions (e.g. the one
which came with RedHat 6.2) only support GIF. As the only differences
to PNGdriver are:

a) whether to call the output file "map.gif" or "map.png",
b) whether to call gdImageGif or gdImagePng in Graph_Close,

I figured that it was worth supporting GD libraries without PNG
support.

gdImageGif writes "non-LZW" GIFs. The data stream is still valid to
the LZW decompressor, but the compressor uses a degenerate encoding
that eliminates the use of the technique which is covered by the
UniSys patent.

> The gdImagePng(); test fails, even if i manually compile a test program.
> But the test programs from gd-1.8.4 all compile. I have at the moment no
> time to investigate further.
> 
> 
> Now i re-run configure on Linux and the gd library is not found, too:
> 
> configure:4783: checking for gd.h
> configure:4793: gcc -E  -I/usr/local/include conftest.c >/dev/null
> 2>conftest.out
> configure:4823: checking for location of GD library
> configure:4852: checking for gdImageCreate in -lgd
> configure:4871: gcc -o conftest -g -O2    conftest.c -lgd   1>&5

[snip]

Note that GD is tested twice, once without $PNGLIB, and once with. If
your libgd is linked against libpng (and doesn't have dependency
information), the first test will fail. The above is the first test
failing. It's the second test which is relevant.

-- 
Glynn Clements <glynn.clements at virgin.net>