Re: Universal libpq.a ?

On Mon, 4 Feb 2008, Tom Lane wrote:

> "Dave Page" <dpage@postgresql.org> writes:
>> On Feb 4, 2008 6:25 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>>> "Dave Page" <dpage@postgresql.org> writes:
>>>> The Mac build of EDB Postgres is universal throughout,
>>>
>>> Yeah?  How painful is it?  We've had more than one request to enable
>>> universal builds.
>
>> There was fair bit of pain getting it to work, but the resulting
>> script isn't overly complex. Note this is based on work by the guys at
>> entropy.ch. Ignore the target directory fudging...
>
> Hmm.  The multiple versions of pg_config.h don't bother me --- the RPM
> distributions have to do something very similar to support multilib
> Linux platforms.  This bit seems pretty brute-force though:
>
>>     # Fixup the makefiles
>>     echo "Post-processing Makefiles for Universal Binary build"
>>     find . -name Makefile -print -exec perl -p -i.backup -e 's/\Q$(LD)
>> $(LDREL) $(LDOUT)\E (\S+) (.+)/\$(LD) -arch ppc \$(LDREL) \$(LDOUT)
>> $1.ppc $2; \$(LD) -arch i386 \$(LDREL) \$(LDOUT) $1.i386 $2; lipo
>> -create -output $1 $1.ppc $1.i386/' {} \; || _die "Failed to
>> post-process the Postgres Makefiles for Universal build"
>
> I thought I'd read that you could solve this problem by using the gcc
> frontend to invoke loading, ie something involving making $(LD) call gcc
> with some options.  I'd be willing to tweak the LDxxx macros a bit if
> needed to enable a solution like that, but changing the Makefiles at
> build time is clearly right out ...
When I was playing with this last week, the problem is that the gcc front end
when passing -Wl,-r still includes other things to make the relocatable SUBSYS.o's.

So, when we try to link, we get duplicate symbols.

I gave up, and just built it twice, and then lipo'd the 2 bin and lib directory
files together as a quick hack.


>
>             regards, tom lane
>
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--
Larry Rosenman                     http://www.lerctr.org/~ler
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