Date: Fri, 16 Sep 2005 10:20:12 -0600 (MDT)
From: Marc Aurele La France <tsi@ualberta.ca>
To: Sam Hartman via RT <rt-comment@krbdev.mit.edu>
Subject: Re: [krbdev.mit.edu #3176]
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On Tue, 13 Sep 2005, Marc Aurele La France wrote:
> On Tue, 13 Sep 2005, Sam Hartman via RT wrote:
>>>>>>> "Marc" == Marc Aurele La France <tsi@ualberta.ca> writes:
>>    Marc> On Tue, 13 Sep 2005, Sam Hartman via RT wrote:
>>    >> Note that the patch to shlib.conf breaks our ABI on AIX.

>>    Marc> How so?  How can wrapping, or not, a shared object into an
>>    Marc> archive affect a programming interface?  And why is this
>>    Marc> wrapping preferable to producing dlopen'able objects?

>> Because it changes the name that appears in the liblist section of the
>> xcoff object.

> ... of the _referencing_ xcoff objects, yes.  That's a good point WRT 
> compatibility with previous releases of mit-krb5 and/or AIX.  But, at least 
> on AIX 5.3, the run-time loader doesn't seem to care whether a referenced .a 
> contains shared or static objects.  So old binaries should be OK.

This assertion of mine turns out to be completely out-to-lunch.

Anyway, after spending more time on this, I'd like to propose the following.

--enable-shared builds a dlopen'able lib.so as I have it;  --disable-shared 
doesn't build a lib.so at all.  --enable-static builds a lib.a as an archive 
of static objects;  --disable-static builds a lib.a as a wrapped shared 
object as you have it.  This for all AIXen.

One issue I already have with this is that more intrusive changes than I 
would like are needed for the --enable-shared --disable-static case.  Also, 
this might limit, or least affect, your options in dealing with the 
--enable-static issue in src/lib/kdb/kdb5.c.

But, on the whole, this strikes me as a viable compromise.

Marc.

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