[bug #41586] Invocation forwarding doesn't work on my system

[Richard Frith-Macdonald]

Update of bug #41586 (project gnustep):

                  Status:                    None => Need Info              
                 Summary: Invocation forwarding doesn't work on a 64bit system
=> Invocation forwarding doesn't work on my system

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Follow-up Comment #2:

Thanks for the report … but there's really too little information describing
your specific system to help much.  Clearly you are running an older version
of Ubuntu, and the exact combination of library/code causing trouble is
unclear.

I just downloaded an Ubuntu virtual machine to try to reproduce the issue, but
the /etc/motd lists the system as 'Ubuntu 13.04 (GNU/Linux 3.8.0-29-generic
x86_64)' which is more recent than yours.

I used the standard packages for that system to do a completely clean
configure/build:
apt-get install gobc build-essential libffi-dev libxml2-dev libxslt-dev
libgnutls-dev libicu-dev

That gives me gcc-4.7.3 (and the libobjc that comes with it) and libffi
3.0.13

The standard NSInvocation tests (run using 'make check') all passed, as did
the test you attached to this issue.

So, possibly your problem is specific to gcc-4.6.3 and the objc library you
are using, or perhaps something else … you might get an idea by looking at
the config.log output from when you configured the base library, or perhaps
some hint from running the testsuite?
 
You could run your test under gdb, set a breakpoint in
GSFFIInvocationCallback, and step through to try to find out why the type
information can't be determined (it does look likely to be compiler, runtime,
or ffi library related).

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