Re: [GtkGLExt] Problems getting gtkglext to work under Cygwin

[Shane Blackett <s blackett auckland ac nz>]

Douglas A. Vechinski wrote:
> Naofumi Yasufuku wrote:
>
> > On 04.2.27 5:09 AM, "Douglas A. Vechinski" 
> > <douglas vechinski dynetics com>
> > wrote:
> >  
> >
> > > I have also tried downloading the gtkglext-win32-1.0.5.zip file from
> > > sourceforge which I thought would be a precompiled version that I could
> > > use under Cygwin.  Unzipped the files in /usr/local.  I then try
> > > compiling siimple.c.  It compiled with no errors.  However when I tried
> > > executing it I get an error that it was unable to located
> > > libgdk-win32-2.0-0.dll.  There is a libgdk-win32-2.0.dll.a under /lib
> > > but it doesn't seem to work.
> > >
> > >   
> >
> >
> > You have to set DLL path to PATH environment variable. If you are using
> > Tor's win32 GTK+ binary, DLLs are located under bin/ directory.
> >
> > Regards,
> > --Naofumi
>
> I had also downloaded Tor'x GTK+ binarys and had the PATH environment 
> variable set  but still had problems.  I was trying to used pre-compiled 
> binaries  of the packages and only resorted to trying to compile 
> GtkGLext when I was having problems.
>
> Okay, let me reiterate my goals.  My primary goal is to be able to 
> compile a gtkglext code under the Cygwin environment so that the 
> executable run under win32 (i.e. so an Xserver is not necessary).  My 
> secondary goal is they same as my primary goal plus being able to throw 
> the -mno-cygwin flag so that the executable does not require the 
> cygwin1.dll.
>
> Now, I downloaded precompiled packages atk, pango, glib, gtk+ from 
> http://web.sfc.keio.ac.jp/~s01397ms/cygwin had the cygwin setup 
> installer install them.  I have been able to compile some gtk+ examples 
> which appear to run under win32 (i.e. I used `pkg-config --cflags --libs 
> gtk+-win32-2.0`).
>
> Next, I downloaded the pre-compiled gtkglext-win32-1.0.5.zip file from 
> sourceforge and unzipped then under /usr/local on my Cygwin 
> installation.  I then changed the prefix line to /usr/local for 
> /usr/local/lib/pkgconfig/gdkglext-win32-1.0.pc and 
> /usr/local/lib/pkgconfig/gtkglext-win32-1.0.pc
>
> When I try compiling a simple gtkglext example, (using gcc -o simple 
> simple.c `pkg-config --cflags --libs gtkglext-win32-1.0`)  it compiles 
> but when executed it complains that it can't find 
> libgdk-win32-2.0-0.dll.  The closest file I have is 
> libgdk-win32-2.0.dll.a under the /lib under cygwin and I have 
> c:\cygwin\bin and c:\cygwin\lib and c:\cygwin\usr\local\bin include in 
> my windows PATH environment variable.
>
> So my questions are:
>
> Should it be possible to achieve my primary goal with the pre-compiled 
> packages I described above?

Yes I successfully cross-compile valid win32 executables from linux with mingw
(which is what you get with -mno-cygwin) against gtkglext.  I did not use
the cygwin installer (as I am building under linux), I have just set out my own
installation.  I am hoping to get time to repeat what I did (several months ago)
in the next few days.  This time I should make some notes which I could share.

> If so, does my description of their installation sound right and the 
> alteration of the .pc files?

Having hand constructed my tree by moving files around my .pc files are all
wrong, so I have not been using pkg-config for my win32 build.  I hope to fix
some of these things knowing that I can generate valid executables.

> If so, why does the resulting executable want the extra -0 in the name 
> of the libgdk file?
>
> Assuming I can get something working, what effect will trying to compile 
> with -mno-cygwin have on compiling and execution?

-mno-cygwin provides a mingw type environment.  This should be OK so long
as you don't have other requirements for cygwin in your code.

> If the above setup won't work for some reason, what do I need to do as 
> far as setup inorder to use Tor's GTK+ binarys but compiling under 
> Cygwin?  Would this route be more "desirable" for end-users, i.e. the 
> people who just want to run/use the code.  Would they just need to 
> install Tor's dlls and set the PATH appropriately?

Yes.  I just provide it all in a zip.

I just had a look around in my build.  I have built gtkgl statically so that I
have a .a rather than a dll.a and so there is no equivalent dll.  I cannot
remember why I did this exactly.  I would hope to make my build more equivalent
to the rest of gtk when I rebuild.

> Lot's of questions, I hope I have provide enough details.  ( I had also 
> made a brief stab at trying to get GtkGLext to work under X11 under 
> Cygwin and had problems but I don't want to chase this rabbit just yet.  
> Hopefully I can eventually get one of the above to work first.)

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