Mailing-List:	contact cygwin-help AT sourceware DOT cygnus DOT com; run by ezmlm
List-Subscribe:	<mailto:cygwin-subscribe AT sources DOT redhat DOT com>
List-Archive:	<http://sources.redhat.com/ml/cygwin/>
List-Post:	<mailto:cygwin AT sources DOT redhat DOT com>
List-Help:	<mailto:cygwin-help AT sources DOT redhat DOT com>, <http://sources.redhat.com/ml/#faqs>
Sender:	cygwin-owner AT sources DOT redhat DOT com
Delivered-To:	mailing list cygwin AT sources DOT redhat DOT com
Message-ID:	<3A2BB83C.2B394F6A@ece.gatech.edu>
Date:	Mon, 04 Dec 2000 10:29:00 -0500
From:	"Charles S. Wilson" <cwilson AT ece DOT gatech DOT edu>
X-Mailer:	Mozilla 4.75 [en] (WinNT; U)
X-Accept-Language:	en
MIME-Version:	1.0
To:	"Steven O'Brien" <steven_obrien AT lineone DOT net>
CC:	cygwin AT cygwin DOT com
Subject:	Re: building dlls, C and C++
References:	<001401c05df0$e4dd0c80$95698cd4 AT emerald>

> Indexes are useful
> mainly for release management, because as long as each exported symbol keeps
> the same index across releases the users of the DLL do not have to re-link
> their applications when upgrading the DLL. 

Sort of.  It depends on whether the application was "linked by name" or
"linked by number".  Windows provides for both possibilities, but I am
not sure which one is used by gcc/ld or if one can specify which link
method to use.  Link by number gives an executable that loads a bit
faster, but prone to breakage when new dll's are released.  That's why
most of the packages I've released include .def files rather than
relying on --export-[all|dynamic] and/or __declspec(dllexport) alone,
just to be safe.

(All my information about link-by-name or link-by-number comes
secondhand from discussions on the libpng-developers mailing list.  I'm
no expert).

--Chuck

--
Want to unsubscribe from this list?
Send a message to cygwin-unsubscribe AT sourceware DOT cygnus DOT com

- Raw text -