Debian Bug report logs - #791013
cppunit: library transition may be needed when GCC 5 is the default

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Message #5 received at maintonly@bugs.debian.org (full text, mbox, reply):

From: Matthias Klose <doko@debian.org>

To: maintonly@bugs.debian.org

Subject: cppunit: library transition may be needed when GCC 5 is the default

Date: Fri, 03 Jul 2015 13:09:29 +0000

Package: src:cppunit
Version: 1.13.2-2
Severity: important
Tags: sid stretch
User: debian-gcc@lists.debian.org
Usertags: libstdc++-cxx11

Background [1]: libstdc++6 introduces a new ABI to conform to the
C++11 standard, but keeps the old ABI to not break existing binaries.
Packages which are built with g++-5 from experimental (not the one
from testing/unstable) are using the new ABI.  Libraries built from
this source package export some of the new __cxx11 or B5cxx11 symbols,
and dropping other symbols.  If these symbols are part of the API of
the library, then this rebuild with g++-5 will trigger a transition
for the library.

What is needed:

 - Rebuild the library using g++/g++-5 from experimental. Note that
   most likely all C++ libraries within the build dependencies need
   a rebuild too. You can find the log for a rebuild in
     https://people.debian.org/~doko/logs/gcc5-20150701/
   Search for "BEGIN GCC CXX11" in the log.

 - Decide if the symbols matching __cxx11 or B5cxx11 are part of the
   library API, and are used by the reverse dependencies of the
   library.

 - If there are no symbols matching __cxx11 or B5cxx11 in the symbols
   forming the library API, you should close this issue with a short
   explanation.
 
 - If there are no reverse dependencies, it should be the package
   maintainers decision if a transition is needed.  However this might
   break software which is not in the Debian archive, and built
   against these packages.

 - If a library transition is needed, please prepare for the change.
   Rename the library package, append "v5" to the name of the package
   (e.g. libfoo2 -> libfoo2v5). Such a change can be avoided, if you
   have a soversion bump and you upload this version instead of the
   renamed package.  Prepare a patch and attach it to this issue (mark
   this issue with patch), so that it is possible to NMU such a
   package. We'll probably have more than hundred transitions
   triggered. Then reassign the issue to release.debian.org and
   properly tag it as a transition issue, by sending an email to
   control@bugs.debian.org:
   
     user release.debian.org@packages.debian.org
     usertag <this issue> + transition
     block <this issue> by 790756
     reassign <this issue> release.debian.org
   
 - If unsure if a transition is needed, please tag the issue with help
   to ask for feedback from other Debian developers.

The libstdc++6 transition will be a large one, and it will come with a
lot of pain.  Please help it by preparing the follow-up transitions.

[1] https://wiki.debian.org/GCC5#libstdc.2B-.2B-_ABI_transition

Message #10 received at 791013@bugs.debian.org (full text, mbox, reply):

From: Matthias Klose <doko@debian.org>

To: 791013@bugs.debian.org

Subject: transition needed

Date: Fri, 10 Jul 2015 14:37:25 +0200

Control: tags -1 + confirmed

at least needed for building nsis, probably more reverse dependencies.

Message #23 received at 791013-maintonly@bugs.debian.org (full text, mbox, reply):

From: Sebastien Bacher <seb128@ubuntu.com>

To: 791013-maintonly@bugs.debian.org, control@bugs.debian.org

Subject: re, cppunit: library transition may be needed when GCC 5 is the default

Date: Thu, 30 Jul 2015 15:31:30 +0200

[Message part 1 (text/plain, inline)]

user release.debian.org@packages.debian.org
usertag 791013 + transition origin-ubuntu wily ubuntu-patch
block 791013 by 790756
reassign 791013 release.debian.org
thanks

There are some symbols changes so a rename is required, attached is a
debdiff prepared for Ubuntu and that should work for Debian as well

Cheers,
Sebastien Bacher

[cppunit_1.13.2-2_1.13.2-2ubuntu1~gcc5.diff (text/x-diff, attachment)]

Message #34 received at 791013-done@bugs.debian.org (full text, mbox, reply):

From: "Steve M. Robbins" <steve@sumost.ca>

To: Sebastien Bacher <seb128@ubuntu.com>

Cc: 791013-done@bugs.debian.org, control@bugs.debian.org

Subject: Re: re, cppunit: library transition may be needed when GCC 5 is the default

Date: Thu, 13 Aug 2015 20:24:55 -0500

[Message part 1 (text/plain, inline)]

On Thu, Jul 30, 2015 at 03:31:30PM +0200, Sebastien Bacher wrote:
> user release.debian.org@packages.debian.org
> usertag 791013 + transition origin-ubuntu wily ubuntu-patch
> block 791013 by 790756
> reassign 791013 release.debian.org
> thanks

Why was this reassigned?  (Makes it hard to find by cppunit
maintainers ... :-)

In any case, Rene Engelhard kindly fixed the bug.

-Steve

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