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Re: Failed install - libgen.so doesn't exist

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: flyvholm(at)fys(dot)ku(dot)dk, pgsql-ports(at)postgresql(dot)org
Subject: Re: Failed install - libgen.so doesn't exist
Date: 2006-02-01 16:31:04
Message-ID: 200602011631.k11GV4G20094@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-ports
Tom Lane wrote:
> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> > Tom Lane wrote:
> >> I'm just wondering how many of those AC_CHECK_LIB calls are needed only
> >> on platforms that no one uses anymore ...
> 
> > I didn't want to mention that, but one big problem we have is that we
> > have no way to know what platforms are still using which configure and
> > pgport functions.  It is very possible that 25% of what we have isn't
> > needed anymore, but we have no way of knowing which part.
> 
> Agreed, but pgport functions that aren't actually selected for use don't
> pose any hazards.  AC_CHECK_LIB is an ongoing hazard for exactly the
> reason the OP presents, namely that it will suck in any random library
> it can find that happens to match by name.  It's especially bad that
> almost all of the tests are coded like
> 	AC_CHECK_LIB(gen,      main)
> which means they don't even try to determine whether the library
> is actually the one intended.
> 
> Now that we have the buildfarm I think that experimentation with this
> sort of thing is a lot less risky than it used to be.  I think we should
> be working towards a project policy that AC_CHECK_LIB calls shalt not
> use "main", but must name some symbol exported by the expected library.
> If we can't find out what symbols the library is expected to provide,
> it's time to dike it out.

Agreed.  Anyone want to do the legwork?

-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman(at)candle(dot)pha(dot)pa(dot)us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

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