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
Date: Thu, 02 Jan 2003 11:30:09 -0500
From: Jason Tishler <jason AT tishler DOT net>
Subject: Cygwin gcc "initializer element is not constant" problem
To: Cygwin <cygwin AT cygwin DOT com>
Mail-followup-to: Cygwin <cygwin AT cygwin DOT com>
Message-id: <20030102163008.GF1524@tishler.net>
MIME-version: 1.0
Content-type: multipart/mixed; boundary="Boundary_(ID_SaDdXNl29QRKLrUMrAEssQ)"
User-Agent: Mutt/1.4i

--Boundary_(ID_SaDdXNl29QRKLrUMrAEssQ)
Content-type: text/plain; charset=us-ascii
Content-transfer-encoding: 7BIT
Content-disposition: inline

The attached code snippet, j2.c, demonstrates a Cygwin specific
compilation problem that affects many Python shared extension modules:

    $ gcc -c j2.c
    j2.c:17: initializer element is not constant
    j2.c:17: (near initialization for `f.get')

It appears that Cygwin gcc considers function pointers marked
"__declspec(dllimport)" unacceptable to use as initializer constants.

My standard workaround is to submit a patch that is the equivalent of
compiling this snippet with -DWORKAROUND:

    $ gcc -DWORKAROUND -c j2.c

Unfortunately, this style of patch is no longer acceptable:

    http://mail.python.org/pipermail/python-dev/2002-December/031534.html

Can anyone suggest a better (hopefully less intrusive) workaround?

Thanks,
Jason

-- 
PGP/GPG Key: http://www.tishler.net/jason/pubkey.asc or key servers
Fingerprint: 7A73 1405 7F2B E669 C19D  8784 1AFD E4CC ECF4 8EF6

--Boundary_(ID_SaDdXNl29QRKLrUMrAEssQ)
Content-type: text/plain; charset=us-ascii; NAME=j2.c
Content-transfer-encoding: 7BIT
Content-disposition: attachment; filename=j2.c

typedef void (*function)();

struct foo
{
	function get;
};

__declspec(dllimport) void f1();

struct foo f =
{
#ifndef WORKAROUND
	f1
#else
	0
#endif
};

void
init()
{
#ifdef WORKAROUND
	f.get = f1;
#endif
}


--Boundary_(ID_SaDdXNl29QRKLrUMrAEssQ)
Content-Type: text/plain; charset=us-ascii

--
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/
--Boundary_(ID_SaDdXNl29QRKLrUMrAEssQ)--