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
Mail-Followup-To: cygwin 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>, <binutils AT sources DOT redhat DOT com>
Subject: RE: [PATCH] exclude runtime-pseudo-reloc symbols from auto-export
Date: Sat, 21 Dec 2002 20:26:14 +0100
Message-ID: <012401c2a926$d3d57bb0$0a1c440a@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
Importance: Normal
X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4133.2400
In-Reply-To: <20021221171952.GA22113@redhat.com>

>>
> >What about putting such symbols in another named text section, so that
> >ld would ignore them ?
>
> I don't see how you could do that since the symbol is associated with an
> existing place in memory.  We could put the whole function in a
> different segment

I had in mind something like this
#define NO_EXPORT_TEXT __attribute__((section(".text_no_export")))
#define NO_EXPORT_DATA __attribute__((section(".data_no_export")))
but this need some additional efforts in the ld source.


> but that's not the kind of solution I was thinking of.
>
> I was thinking that there might be an unused attribute that could be
> pressed into service as a "don't auto export" (doesn't linux/elf have
> something like this?) or that there was a way to name the symbol in some
> way that wasn't easily available from a C program, like putting a "." in
> the name with an asm alias.

The weak attribute does not have any effect for at least gcc version 2.95.3-5
(cygwin special) and I can't see any other attribute, which could be used from
http://gcc.gnu.org/onlinedocs/gcc-3.2/gcc/Function-Attributes.html#Function%20At
tributes

Perhaps somebody else could see something usefull or the gcc could be patched to
uses the weak attribute ???

Ralf


--
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/