From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-365656-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 18881 invoked by alias); 16 Aug 2011 14:17:52 -0000
Received: (qmail 18873 invoked by uid 22791); 16 Aug 2011 14:17:51 -0000
X-SWARE-Spam-Status: No, hits=-2.9 required=5.0	tests=ALL_TRUSTED,AWL,BAYES_00
X-Spam-Check-By: sourceware.org
Received: from localhost (HELO gcc.gnu.org) (127.0.0.1)    by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Tue, 16 Aug 2011 14:17:36 +0000
From: "ml@convergent-it.at" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/50044] Attributes for explicit template instantiation are ignored after an implicit template instantiation occurred.
Date: Tue, 16 Aug 2011 14:18:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: ml@convergent-it.at
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields:
Message-ID: <bug-50044-4-TRPb4yeCJx@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-50044-4@http.gcc.gnu.org/bugzilla/>
References: <bug-50044-4@http.gcc.gnu.org/bugzilla/>
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
MIME-Version: 1.0
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
X-SW-Source: 2011-08/txt/msg01430.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50044

--- Comment #9 from Martin Lederhilger <ml@convergent-it.at> 2011-08-16 14:17:32 UTC ---
Results for:

template<class T>
class INTERFACE A : public Base
...

Case one without "extern template": warning is still there but links fine.
Case two with "extern template": still undefined reference to `typeinfo for
A<int>'

I should note that I cannot use INTERFACE on the class template definition,
because I want to explicitly instantiate the template in multiple DLLs and then
I would need dllimport and dllexport at the same time on the class template
definition. For example instantiate A<int> in A.dll, and A<float> in B.dll:
When I want to use A<int> and A<float> in B.dll then I would need dllimport and
dllexport at the same time. Thats why I want to apply INTERFACE to "extern
template INTERFACE...".

Output from nm for case two (with "extern template...") generated by
i686-mingw32-nm dll.dll | i686-mingw32-c++filt > nm.txt