PGI and C++ templates

[Jeff Squyres]

Can I impose on the good will of a libtool wizard?  I could attempt  
this myself, but I don't have a good track record mucking around in the  
LT source.  ;-)

Here's the situation: on branch-1-5, we have good PGI compiler support  
-- *except* for libraries with C++ templates.  For that, we need some  
more work (someone identified this recently -- I'm afraid I don't  
remember who).  I have mailed the PGI support folks (CC'ed on this  
mail) and they have told me what needs to be done (if you care, the  
full thread is here:  
http://www.pgroup.com/userforum/viewtopic.php? 
t=172&postdays=0&postorder=asc&start=0):

------
For each source file in the library, compile it:

$ pgCC -c --one_instantiation_per_object $(YOUR_FLAGS) file.cc

You must now do an extra pre-link step to instantiate all the templates  
used in this library, putting all the library .o's on this line, and no  
-c flag.

$ pgCC --one_instantiation_per_object --prelink_objects $(YOUR_FLAGS)  
file1.o file2.o etc.

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.
-----

Is there any way someone can add this to Libtool (preferably both  
1.5.x and 2.0.x), or provide me with some guidance on how to do so? (I  
did "ok" in tinkering around to add simple command line switch changes,  
but the multi-step outlined procedure would take me a loooong time to  
figure out).

There's one condition: this is only necessary for PGI compiler versions  
5.2-4 and prior of their compiler.  With their most recent version  
(soon to be released) -- 6.0 -- none of this is necessary, and what we  
have now in Libtool will work just fine (i.e., they cleaned up the  
compiler to do templates in libraries much better -- the entire  
multi-step process listed above is unnecessary).

Here's a quick-n-easy way to get the version of the compiler:

pgcc_major_ver=`pgCC -V | awk '/pgCC/ { print \$2 }' | cut -d. -f1`
pgcc_need_extra=`expr $pgcc_major_ver \< 6`

So if $pgcc_need_extra is 1, then we need to do the multi-step  
procedure listed above.

How does that sound?

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