Re: AIX compilation problems (was Re: Proposal ...)

Samuel A Horwitz wrote:
> has this patched been applied to the CVS yet?

No, I was waiting to see if there were any negative comments, but seeing
none, I will add it to the patch queue today.

---------------------------------------------------------------------------

>
>
> On Tue, 1 Oct 2002, Zeugswetter
> Andreas SB SD wrote:
>
> > Date: Tue, 1 Oct 2002 10:23:13 +0200
> > From: Zeugswetter Andreas SB SD <ZeugswetterA(at)spardat(dot)at>
> > To: Peter Eisentraut <peter_e(at)gmx(dot)net>
> > Cc: PostgreSQL Development <pgsql-hackers(at)postgresql(dot)org>
> > Subject: Re: AIX compilation problems (was Re: [HACKERS] Proposal ...)
> >
> >
> > > > Attached is a patch to fix the mb linking problems on AIX. As a nice side effect
> > > > it reduces the duplicate symbol warnings to linking libpq.so and libecpg.so
> > > > (all shlibs that are not postmaster loadable modules).
> > >
> > > Can you explain the method behind your patch? Have you tried -bnogc?
> >
> > -bnogc would (probably) have been the correct switch reading the man page,
> > but the method was previously not good since it involved the following:
> >
> > 1. create a static postgres executable from the SUBSYS.o's
> > 2. create an exports file from above
> > 3. recreate a shared postgres executable
> >
> > This naturally had a cyclic dependency, that could not properly be
> > reflected in the Makefile (thus a second make sometimes left you with
> > a static postgres unless you manually removed postgres.imp).
> >
> > Now it does:
> > postgres.imp: $(OBJS)
> > create a temporary SUBSYS.o from all $(OBJS)
> > create a postgres.imp from SUBSYS.o
> > rm temporary SUBSYS.o
> >
> > postgres: postgres.imp
> > link a shared postgres
> >
> > A second change was to move the import and export files to the end of the link line,
> > then the linker knows not to throw a duplicate symbol warning, and keeps all symbols
> > that are mentioned in the exports file (== -bnogc restricted to $(OBJS) symbols).
> >
> > Thus now only libpq.so and libecpg.so still show the duplicate symbol warnings since their
> > link line should actually not include postgres.imp . I did not see how to make a difference
> > between loadable modules (need postgres.imp) and interface libraries (do not need postgres.imp),
> > but since the resulting libs are ok, I left it at that.
> >
> > I tested both gcc and xlc including regression tests.
> >
> > Andreas
> >
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>
>
> horwitz(at)argoscomp(dot)com (Samuel A Horwitz)
>
>
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