Public bug reported:
bobcat 6.15.01-1 (stonking-proposed) removes exported symbols from
libbobcat.so.6 without a soname bump. Binaries built against older
libbobcat-dev fail to start with it.
Visible symptom: the flexc++ autopkgtest regression blocking bobcat:
flexc++: symbol lookup error: flexc++: undefined symbol: _ZN3FBB7PatternD1Ev
Cause: up to 6.11, FBB::Pattern declared its destructor, copy/move
constructors and assignment operators, and the library defined them
(pattern/destructor.cc, destroy.cc, ...). In 6.15 the class no longer
declares them, so they are generated inline in each user, and 37 symbols
exported by 6.11 are gone in 6.15. Ubuntu builds bobcat with -flto=auto,
which also drops FBB::Pattern::~Pattern() from the exports. Debian's
non-LTO build of the same version still exports it (1951 vs 2406 dynamic
symbols).
Affected binaries (amd64; checked the undefined, non-weak FBB symbols of every
libbobcat6 reverse dependency against the stonking-proposed library):
* in proposed: flexc++ 2.19.00-1, filtermail 1.07.01-1
* in release, broken once bobcat migrates: bisonc++ 6.09.02-1, gpg-remailer
3.04.07-1build1, oxref 2.02.00-1build1, stealth 4.04.00-2build1
* not affected: guncat, natlog, simrisc, ssh-cron, xd, multispeech
Fix: no-change rebuilds against libbobcat-dev 6.15.01-1, plus Breaks in
libbobcat6 so the rebuilds migrate together with bobcat:
Breaks: bisonc++ (<< 6.09.02-1build1), filtermail (<< 1.07.01-1build1),
flexc++ (<< 2.19.00-1build1), gpg-remailer (<< 3.04.07-1build2), oxref (<<
2.02.00-1build2), stealth (<< 4.04.00-2build2)
Tested in a stonking-proposed container: all six rebuild cleanly against
6.15. The rebuilt binaries reference no missing symbols, and flexc++,
bisonc++ and filtermail run. bobcat 6.15.01-1ubuntu1 with the Breaks
builds fine.
Upload order: bobcat must be published in proposed first, so that the
rebuilds build against 6.15. Then bisonc++, flexc++ (they build-depend
on each other; the release versions break with 6.15, see below),
filtermail, gpg-remailer, oxref and stealth.
Debian: the same ABI break affects unstable/forky. Debian's filtermail
1.07.01-1 fails to start with Debian's libbobcat6 6.15.01-1 (undefined
symbol: _ZN3FBB7PatternaSEOS0_,
FBB::Pattern::operator=(FBB::Pattern&&)). No Debian bug has been filed
yet.
** Affects: bisonc++ (Ubuntu)
Importance: Undecided
Status: Fix Committed
** Affects: bobcat (Ubuntu)
Importance: Undecided
Status: Triaged
** Affects: filtermail (Ubuntu)
Importance: Undecided
Status: Fix Committed
** Affects: flexc++ (Ubuntu)
Importance: Undecided
Status: Fix Committed
** Affects: gpg-remailer (Ubuntu)
Importance: Undecided
Status: Fix Committed
** Affects: oxref (Ubuntu)
Importance: Undecided
Status: Fix Committed
** Affects: stealth (Ubuntu)
Importance: Undecided
Status: Fix Committed
** Affects: bisonc++ (Debian)
Importance: Unknown
Status: Unknown
** Tags: update-excuse
** Tags added: update-excuse
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https://bugs.launchpad.net/bugs/2169636
Title:
bobcat 6.15 drops exported symbols without soname bump; flexc++,
filtermail and other reverse dependencies need rebuilds
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