Re: AIX patch for libtool.m4

[jedwards]

I tried to explain this to Robert before I don't think I've convienced 
him yet. 

Currently the default libtool behavior for AIX 5 is to do this with an 
archive:

cc -Wl,-bM:SRE -o .libs/libhello.so.2  .libs/hello.o .libs/foo.o  -lm 
-lc  -Wl,-bE:.libs/libhello.exp -Wl,-bnoentry
ar cru libhello.a libhello.so.2
ar cru libhello.a hello.o foo.o

which puts both these objects files in the archive twice - only the 
first entry into the archive is read so this is just a waste of space.  
Now I notice that there is an exception in libtool.m4 for aix4 which 
sorta fixes this problem by not doing the second ar command - you could 
just extend that to aix5.  But I think that its the wrong way to solve 
the problem.
The first ar statement, not the second - is the one which should be 
eleminated to produce a standard AIX library. 

Now for run time linking support AIX has the -brtl flag which causes it 
to look for a file libname.so before libname.a  I'm working on this 
change and I have almost everything going but its still failing a few of 
the tests -  I should be there soon. 

You are right about the template problem - thats what got me going on 
this whole thing in the first place. 

I'm probably not explaining things very well -
I hope Rob that you will give my change fair consideration when I get it 
done - including reviewing it with other IBM  authorities if you feel 
the need.



Boehne, Robert wrote:

> The only thing I was aware of is that archive members can't
> be dlopen'd by libltdl because the right flags aren't passed.
>
> BTW, would you post a link or reference to why -qmkshrobj is needed
> with templates when building SYSV-style libraries?  I wasn't aware
> of any problems with templates.
>
> Rob
>
> -----Original Message-----
> From: Albert Chin [mailto:address@hidden
> Sent: Friday, May 30, 2003 2:30 PM
> To: jedwards
> Cc: address@hidden
> Subject: Re: AIX patch for libtool.m4
>
>
> On Fri, May 30, 2003 at 01:20:44PM -0600, jedwards wrote:
>  
>
> > I'm working on a general update to libtool.m4 for aix5 and aix library 
> > support - do you want to wait a week or so to see what I manage to do? 
> >    
>
> I think the only thing lacking is xlC support. Of course, there's also
> 32/64-bit support but there's a workaround for that. What else are you
> working on?
>
>  
>
> > Albert Chin wrote:
> >
> >    
> >
> > > On Tue, May 27, 2003 at 02:40:04PM -0500, Boehne, Robert wrote:
> > >
> > >
> > >      
> > >
> > > > Ok, that was interesting.  Apparently Jim, you are correct, it is valid to
> > > > add -qmkshrobj to a -G command line.  However, I do not believe that
> > > > Libtool should do this by default.  If you want to add it yourself you 
> > > > can,
> > > > Libtool allows this with -XCompiler -XLinker and -XCCLinker.  If you still
> > > > think this should be done by default, let us know why.
> > > >  
> > > >
> > > >        
> > > Wel, to get xlC C++ support for AIX, we're going to need -qmkshrobj.
> > > I'm going to work on adding it this weekend. By default, -qmkshrobj
> > > will export all symbols. We create our own export list for xlc C
> > > shared libraries. Do we want to create our own export list for xlc C++
> > > shared libraries as well?
> > >
> > >
> > >
> > >      
> > --
> > Jim Edwards             address@hidden
> > IBM Applications Analyst
> > NCAR SCD
> > BOULDER CO  303-497-1842 
> >
> >
> >
> >
> > _______________________________________________
> > Libtool-patches mailing list
> > address@hidden
> > http://mail.gnu.org/mailman/listinfo/libtool-patches
> >    
>
>  


--
Jim Edwards             address@hidden
IBM Applications Analyst
NCAR SCD
BOULDER CO  303-497-1842