fxruby-users

[Fxruby-users] Re: Build problem with FXRuby on Debian

[Lyle J. <ly...@kn...>]

On Nov 24, 2003, at 3:52 AM, cj...@ma... wrote:

> I have Ruby 1.8.0 on Debian, and built FXRuby-1.0.27 last night.
> In irb, require 'fox' yields:
>
> LoadError: /usr/local/lib/ruby/site_ruby/1.8/i686-linux/fox.so: 
> undefined symbol: _ZN5FXApp9metaClassE - 
> /usr/local/lib/ruby/site_ruby/1.8/i686-linux/fox.so
>         from /usr/local/lib/ruby/site_ruby/1.8/i686-linux/fox.so
>
> c++filt says _ZN5FXApp9metaClassE is FXApp::metaClass.
>
> Any idea why this symbol is undefined?
>

Please see the topic "Cannot load library" under the "Things That Can 
Go Wrong" section of this page:

	http://www.fxruby.org/doc/build.html

I am guessing that the FOX library (libFOX.so) is installed in a 
directory that isn't in the load path for dynamic libraries.

Hope this helps,

Lyle

[Fxruby-users] Re: Build problem with FXRuby on Debian

[<ly...@kn...>]

On Tue, 25 Nov 2003 08:45:35 +1100, cj...@ma... wrote :

> > Please see the topic "Cannot load library" under the "Things That Can 
> > Go Wrong" section of this page:
> 
> I have done, it isn't that problem.

OK. Can you show me the output of:

    ldd /usr/local/lib/ruby/site_ruby/1.8/i686-linux/fox.so

on your system?

[Fxruby-users] Re: Build problem with FXRuby on Debian

[<ly...@kn...>]

On Tue, 25 Nov 2003 09:07:15 +1100, cj...@ma... wrote :

> > OK. Can you show me the output of:
> >     ldd /usr/local/lib/ruby/site_ruby/1.8/i686-linux/fox.so
> > on your system?
> 
> $ ldd /usr/local/lib/ruby/site_ruby/1.8/i686-linux/fox.so
>         libFOX-1.0.so.0 => /usr/lib/libFOX-1.0.so.0 (0x404dc000)

<snip>

The symbol it claims is missing (FXApp::metaClass) is a static member of the
FXApp class, and it is declared by the FXDECLARE macro that appears in the
FXApp class definition:

    class FXAPI FXApp : public FXObject {
      FXDECLARE(FXApp)
      ... and so on ...
      };

The FXDECLARE macro itself is defined in FXObject.h:

    #define FXDECLARE(classname) \
      public: \
        struct FXMapEntry { ... }; \
        static const FXMetaClass metaClass; \
        ... and so on ...

So I can't see why this would be missing, unless something went wrong when
building the FOX library (libFOX.so). Just curious, can you run any of the
FOX example programs (i.e. those for the C++ library)? They are found under
the "tests" subdirectory of the FOX source code distribution.

Hope this helps,

Lyle

[Fxruby-users] Re: Build problem with FXRuby on Debian

[<cj...@ma...>]

> The symbol it claims is missing (FXApp::metaClass) is a static member of

Thanks Lyle, I'll chase it.  None of the examples work, since I can't
even "require 'fox'". I didn't get any compile errors, but at least I
have more idea where to look.  Will let you know.

> The FXDECLARE macro itself is defined in FXObject.h:

Yup, but this doesn't define the static, just declares it. Where are these
statics defined?

Clifford Heath.

[Fxruby-users] Re: Build problem with FXRuby on Debian

[Lyle J. <ly...@kn...>]

On Nov 24, 2003, at 5:16 PM, cj...@ma... wrote:

>> The FXDECLARE macro itself is defined in FXObject.h:
>
> Yup, but this doesn't define the static, just declares it. Where are 
> these
> statics defined?

Oh, yes. The FXIMPLEMENT macro (also found in FXObject.h) is the 
counterpart of the FXDECLARE macro, and you should find the statement:

	FXIMPLEMENT(FXApp, FXObject, ...)

somewhere in FXApp.cpp. This is the one that actually defines 
FXApp::metaClass and the other declarations from FXDECLARE.

[Fxruby-users] Re: Build problem with FXRuby on Debian

[Lyle J. <ly...@kn...>]

On Nov 25, 2003, at 2:10 AM, cj...@ma... wrote:

>> 	FXIMPLEMENT(FXApp, FXObject, ...)
>> somewhere in FXApp.cpp. This is the one that actually defines
>> FXApp::metaClass and the other declarations from FXDECLARE.
>
> Ok, but I can't see FXApp.cpp anywhere - FXRbApp.cpp is there though.
> I assume it's meant to be built from FXApp.i (though I don't have SWIG
> installed), because it isn't in the source archive. Is this a simple
> omission?

FXApp is a class from the original FOX library (libFOX.so) and so its 
source files (FXApp.cpp and FXApp.h) are found in the FOX source code 
tree. Go to the directory where you originally built FOX and look under 
the 'src' directory, e.g.

	/home/cjh/fox-1.0.42/src/FXApp.cpp

Hope this helps,

Lyle

[Fxruby-users] Re: Build problem with FXRuby on Debian

[<cj...@ma...>]

> FXApp is a class from the original FOX library

Just worked that out - and that I had a dodgey Debian libfox and libfox-dev
package installed. Removed them, and reinstalled the current ones (libfox1.0
and libfox1.0-dev) and it all works. I guess the Debian package maintainer
screwed up the updates so I didn't have the current versions.

Sorry for all the noise, I'll be quiet now.

Re: [Fxruby-users] Re: Build problem with FXRuby on Debian

[Lyle J. <jl...@cf...>]

cj...@ma... wrote:

> Sorry for all the noise, I'll be quiet now.

No problem, glad we were able to get it resolved!