Re: PGI and C++ templates

[Jeff Squyres]

On Mar 7, 2005, at 3:07 AM, Ralf Wildenhues wrote:

> > > Achive or build the shared library as before, except you must include
> > > the new hidden templates in the Template.dir directory:
> > >
> > > $ ar qv lib_mylib.a Template.dir/*.o file1.o file2.o etc.
>
> At the moment, Template.dir/ is not cleaned by `make clean'.  This
> should be done, I'm not sure whether by Automake rules or by Libtool.

But this has always been a problem, right?  (i.e., not just with the 
PGI compilers)

I've long since added my own m4 to my configure scripts to see if the 
C++ compiler uses a template subdirectory, and if so, add it to 
CLEANFILES.

Has something changed that I no longer need to do this?

> What happens if you have source files which used to provide/use
> templates, but no longer do so, but still have objects lying around in
> Template.dir/, which now get erroneously added to the static/shared
> archive?

This is definitely a problem. :-\

I always just took care to run "make clean" or manually remove the 
template subdirs in those cases.  If AM/LT/somebody could take of this 
for me, that would be fantastic.

> What about objects in Template.dir/ which do not belong to the current
> link at all (because they belong in a different library)?  Do we have
> to know the names of all objects from Template.dir/*.o to use or can
> we just add all of them without problems?  Remember we may not be
> allowed to add exported symbols to the library as that will destroy
> runtime (in the case of shared linking) or program-link-time (in the
> case of static linking) link order.

Hmm.  Good question.  I guess one option here may be to use the 
--instantiation_dir switch to have a different "Template.dir" (so to 
speak) for each target library...?  I'm not quite sure how that would 
work, though, because AM would be the one with this knowledge (i.e., 
know which source files belong to which library) -- I don't know how AM 
would pass this information down to LT [in a clean manner]...

--
{+} Jeff Squyres
{+} address@hidden
{+} http://www.lam-mpi.org/