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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>
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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

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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
}


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