From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Martin v. Loewis" <martin@mira.isdn.cs.tu-berlin.de>
To: carlo@runaway.xs4all.nl
Cc: egcs@cygnus.com
Subject: Re: #pragma interface && generating virtual tables (of templates?)
Date: Sun, 28 Feb 1999 22:53:00 -0000
Message-ID: <199902201932.UAA03305@mira.isdn.cs.tu-berlin.de>
References: <199902201741.SAA11876@jolan.ppro>
X-SW-Source: 1999-02n/msg00966.html
Message-ID: <19990228225300.9a3O1gphnuFotrLPR3Yhn4f4r8Kk1OTYh6GvsmTTUI8@z>

> /home/carlo/c++/egcs.bugs/bug3/ircd.lag.cc:34: undefined reference to `server_sock_dct virtual table'
[...]
> Am I correct to think that this would be a bug, because
> templates should not be influenced by '#pragma interface'
> at all (since they don't generate code by themselfs to
> begin with)?

I'd agree this is a bug, at least on the information you provided. Of
course, providing a full bug support (i.e. including preprocessor
output of ircd.lag.ii) shouldn't be that difficult, unless you've
copyright problems.

The virtual table for server_sock_dct should get emitted into
ircd.lag.o. As a work-around, you can probably force this by 
implementing get_output_stream out-of-line.

> I understand this is all pretty vague :(, because I can't provide
> a working example - but perhaps someone can give me a clue on
> whether or not using #pragma interface is deprecated in this case
> and/or if I can organize things differently so I won't get undefined
> virtual tables all the time :)

I'd say #pragma interface is deprecated, period. If you count the
trouble you had with it, don't you agree that it wasn't worth it?
With the new weak and link-once symbols on Linux-ELF, there is hardly
any use for it anymore.

Regards,
Martin