[GRASS-dev] lib/pngdriver Mingw compile error

[Glynn Clements]

Paul Kelly wrote:

> >> Next problem is this one here:
> >>
> [...]
> >> OBJ.i686-pc-mingw32/main.o(.text+0x188): In function `main':
> >> c:/grass/grass6/display/drivers/PNG/main.c:43: undefined reference to `LIB_main'
> >>
> >> collect2: ld returned 1 exit status
> >> make: *** [/c/grass/grass6/dist.i686-pc-mingw32/driver/PNG] Error 1
> >> sh-2.04$
> >>
> >> LIB_main() should be defined in libgrass_driver, right?
> >
> > Right; lib/driver/main.c.
> >
> >> Bit lost on this
> >
> > Same here. As it's linking with -lgrass_driver, I have no idea why you
> > are getting that error. Can you use nm or dlltool to check that the
> > symbol is actually present in libgrass_driver.
> 
> It wasn't there! I think the problem is this bit in lib/driver/Makefile:
> ifneq ($(HAVE_SOCKET),)
>    LIB_OBJS += \
>          main.o\
>          command.o\
>          connect_fifo.o\
>          connect_sock.o
> endif

Oops. I forgot to mention that the display drivers simply won't
compile on native Windows. I know that, but for some reason it didn't
register when I was writing my reply.

In my previous message, I mentioned:

> That still leaves one more problem:
> 
> 5. Native windows doesn't support PF_LOCAL (Unix-domain) sockets.

This is the problem.

> $HAVE_SOCKET is empty because the configure script isn't detecting sockets 
> properly. This page: http://www.mingw.org/MinGWiki/index.php/sockets 
> appears to give some useful information on what needs done but I'm not 
> sure if some or any of it has been done already in other parts of GRASS? 
> E.g. how have some people got native Windows GRASS working and not come 
> across this before?

By ignoring any errors related to the drivers. Drivers don't work on
native Windows; at all. That's why you have to use gis.m, which uses
direct (driver-less) rendering.

-- 
Glynn Clements <glynn at gclements.plus.com>