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From Bojan Smojver <bo...@rexursive.com>
Subject Re: [PATCH] DBD drivers as DSOs
Date Mon, 12 Mar 2007 23:04:25 GMT
On Mon, 2007-03-12 at 21:51 +0000, Nick Kew wrote:

> Not really.  It's just #ifdefs in the source.
> 
> But within those #ifdefs it could emit a startup message detailing
> exactly what it's compiled for.

I understand Joe's proposal to mean that a magic number will be included
within the apr_dbd.h, therefore making it compiled-in into the third
party (or APU-shipped) driver. If that magic matches what the apr-util
knows about, the driver is accepted after being dynamically linked. This
is the APU API/ABI compatibility check.

On the other hand, the actual .so being loaded, say apr_dbd_mysql.so,
would already have references to correct shared libraries, put in at
link time (e.g. libmysqlclient_r.so.15 or some other version), which
should in itself make sure that incorrect driver isn't loaded. In other
words, dynamic linker will enforce this restriction anyway.

Or did I miss something again?

-- 
Bojan


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