Re: problems installing openmpi_ext

[Alexander Hansen]

On 9/8/13 6:33 AM, Benjamin Abbott wrote:
> On Sep 8, 2013, at 8:42 AM, Francis Poulin <address@hidden> wrote:
>
> > Hello,
> >
> > Thanks to both of you for looking into this.  I am happy to try this in the 
> > debugger but I admit that I've never used it before and I'm having problems 
> > getting started.
> >
> > First, you don't mean to use the debugger in octave I bather?  I tried starting
> >
> > octave --debug
> >
> > and that give a lot of output, none of which seemed at all useful.
> >
> > Second ,you suggest running octave in a debugger and show 'run-octave -g'.  I 
> > did not know you could run octave in a debugger and am not sure exactly how to 
> > do that.  If you could get me started I'm happy to share the output.
> >
> > Thanks again,
> > Francis
>
> Run octave in the gnu debugger, start octave, execute the parcell_example 
> script, when octave crashes run a back trace. The commands are ...
>
> run-octave -g
> run
> parcell_example
> bt
>
> The copy the output from bt into your reply.
>
> Ben

Let me elaborate on how to do this via Fink:

1)  "run-octave" doesn't get installed under the default Octave build 
and install operation, which is more or less what we do, and Fink by 
default deletes the Octave build directory to save space, so it's 
probably not present.

"fink -k rebuild octave" will do another build but not delete the build 
directory. (The default location is /sw/src/fink.build/octave-3.6.4-5/)

2)  When you do that rebuild, You might want to edit the CFLAGS and 
CXXFLAGS settings in 
/sw/fink/10.7/stable/main/finkinfo/sci/octave-3.6.4.info to include the 
"-g" flag, e.g

 export CFLAGS='-O3 -MD -g'

to generate debug symbols (I'll probably turn that on for everybody the 
next time I put out a new revision).

3)  However, I found when I tried this kind of operation last that 
Apple's clang didn't seem to generate the full debugging information, or 
possibly that the gdb debugger as provided by Xcode 4.x didn't know what 
to do with it.  Some additional things to try would be

a) Install Fink's gdb package, which is newer than what Xcode has
b) Switch the compilers in the "SetCC" and "SetCXX" lines of 
octave-3.6.4.info to be gcc-fsf-4.8 and g++-fsf-4.8, respectively.

I've got a build going right now to do any or all of these.
--
Alexander Hansen, Ph.D.
Fink User Liaison
My package updates: http://finkakh.wordpress.com/