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Message-ID:	<52CEE1A1.9000508@users.sourceforge.net>
Date:	Thu, 09 Jan 2014 11:51:29 -0600
From:	"Yaakov (Cygwin/X)" <yselkowitz AT users DOT sourceforge DOT net>
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To:	cygwin AT cygwin DOT com
Subject:	Re: Troubles building PPL 1.0 on Cygwin64
References:	<CAHhGz8-KiNuY+2oA7RTcokedT-WpdNYZ+4Z60hwwoz40y_Ombw AT mail DOT gmail DOT com>
In-Reply-To:	<CAHhGz8-KiNuY+2oA7RTcokedT-WpdNYZ+4Z60hwwoz40y_Ombw@mail.gmail.com>

On 2014-01-09 11:14, Jean-Pierre Flori wrote:
> I'm having issues building PPL (or more exactly the C interface of
> PPL) on Cygwin64 (1.7.27, gcc/g++ 4.8.2).
[snip]
> Disabling all the weak symbols magic in src/ppl.hh let ppl and its C
> interface compile.
> Note that PPL actually tests that weak symbols are supported, so it
> thought it would be ok, and indeed the symbol is here n the shared
> lib, but in the end it did not make into the import lib.
>
> What's surprising is that I had no issues with Cygwin32.
> So is gcc/g++/ld/binutils configured/behaving differently?

In general, weak symbols don't work the same way they do on ELF.  But 
wrt the difference between i686 and x86_64, see the following threads:

http://cygwin.com/ml/cygwin-developers/2013-03/msg00120.html
http://cygwin.com/ml/cygwin-developers/2013-04/msg00008.html


Yaakov


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