Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sources.redhat.com/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sources.redhat.com/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com
From: "Ralf Habacker" <Ralf DOT Habacker AT freenet DOT de>
To: <cygwin AT cygwin DOT com>
Subject: RE: duplicate regexec/regcomp functions detected
Date: Fri, 28 Dec 2001 12:14:04 +0100
Message-ID: <000d01c18f90$c37bfd30$0e6307d5@BRAMSCHE>
MIME-Version: 1.0
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
X-Priority: 3 (Normal)
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook 8.5, Build 4.71.2173.0
Importance: Normal
X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4133.2400
In-Reply-To: <20011227174239.GA24897@redhat.com>

>
> On Thu, Dec 27, 2001 at 06:22:43PM +0100, Ralf Habacker wrote:
> >> -----Original Message-----
> >> From: cygwin-owner AT cygwin DOT com [mailto:cygwin-owner AT cygwin DOT com]On Behalf
> >> Of Corinna Vinschen
> >> Sent: Friday, December 14, 2001 11:36 AM
> >> To: cygwin
> >> Subject: Re: duplicate regexec/regcomp functions detected
> >>
> >>
> >> On Thu, Dec 13, 2001 at 09:18:39PM +0100, Ralf Habacker wrote:
> >> > Hi all,
> >> >
> >> > kde needs the regexp functions regexec and regcomp.
> >> >
> >> > The cygwin lib contains the System V8 function call style, while the pcre
> >> package (pcreposix)
> >> > provides another style (the system V style I guess). The problem is now, that
> both libs
> >> > supports the same names for regexec and regcomp but with different
> >> parameter/return types.
> >> > This results sometimes in execution failures if the libs are not in the right
> order like
> >> > shown in the following example.
> >> >
> >> > pcre regexp wanted
> >> >
> >> > $ gcc ... -lpcreposix -lcygwin   -> okay
> >> >
> >> > $ gcc ... -lpthreads|-lm|-lc -lpcreposix -lcygwin   -> failure: the functions in
> >> cygwin lib
> >> > are used
> >>
> >> But that order should never happen EXCEPT you're making the big
> >> mistake to give `-lm' or `-lc' on the command line explicitly.
> >> Since -lcygwin is appended automagically and libc.a and libm.a
> >> are the same library anyway, the answer is simply, "Don't do that."
> >
> >This may be for -lm and -lc, but what about libpthread
> >
> >Think about this link line:
> >
> >gcc -o test -lpthread main.o [-lcygwin]
> >
> >This will result in multiple defined symbols for WinMain (expected that
> >main.o contains a main function).  You can say don't do this, but what
> >about bigger packages like qt.  The qt configuring process does only
> >allow like the above link line.
>
> The above link line makes no sense.  It is wrong.  It should be
> corrected.
>
May be, but I think you know some combinations that are real. what is with this ?

Assume main.o needs to be linked to the pcreposix lib.

gcc -o test main.o -lpthread -lpcreposix

or this if main needs to be linked to the regex lib.

gcc -o test main.o -lpthread -lregex

This will fail and the users have to figure out deeply why this does not work. Isn't it ?

The result of this is, that the packager of the pcre and the regex package have to add a note
in their documentation that their lib must be the first lib before -lg or -lpthread and
perhaps more libs in the future. Make this sense ?

Regards
Ralf

>
> cgf
>
> --
> Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
> Bug reporting:         http://cygwin.com/bugs.html
> Documentation:         http://cygwin.com/docs.html
> FAQ:                   http://cygwin.com/faq/
>
>


--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Bug reporting:         http://cygwin.com/bugs.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/