This package currently fails to build (at least on the amd64
architecture) with link time optimizations enabled.  For a background
for LTO please see

https://wiki.debian.org/ToolChain/LTO

The goal is to enable this optimization by default in an upcoming
Debian release in dpkg-buildflags for 64bit architectures.  The goal
is to get this package to build with link time optimizations, or to
explicitly disable link time optimizations for this package build.

To reproduce the build failure, enable the lto optimization in
testing/unstable by adding "optimize=+lto" to DEB_BUILD_MAINT_OPTIONS
in the debian/rules file, or if this macro is unset, just set it:

export DEB_BUILD_MAINT_OPTIONS = optimize=+lto

Please try to fix the build with lto enabled, fixing the packaging or
forwarding the issue upstream. If the issue cannot be fixed,
explicitly disallow building the package with lto by adding to your
rules file:

export DEB_BUILD_MAINT_OPTIONS = optimize=-lto

or adding that string to your existing setting of DEB_BUILD_MAINT_OPTIONS.

The full build log can be found at:
http://qa-logs.debian.net/2022/06/09/dpkglto/telepathy-qt_0.9.8+ds-4_unstable_dpkglto.log
The last lines of the build log are at the end of this report.

[...]
+#MISSING: 0.9.8+ds-4# _ZTIN2Tp14ChannelFactory12SubclassCtorINS_20StreamedMediaChannelEEE@Base 0.9.5
+#MISSING: 0.9.8+ds-4# _ZTIN2Tp14ChannelFactory12SubclassCtorINS_23IncomingDBusTubeChannelEEE@Base 0.9.5
+#MISSING: 0.9.8+ds-4# _ZTIN2Tp14ChannelFactory12SubclassCtorINS_23OutgoingDBusTubeChannelEEE@Base 0.9.5
+#MISSING: 0.9.8+ds-4# _ZTIN2Tp14ChannelFactory12SubclassCtorINS_25IncomingStreamTubeChannelEEE@Base 0.9.5
+#MISSING: 0.9.8+ds-4# _ZTIN2Tp14ChannelFactory12SubclassCtorINS_25OutgoingStreamTubeChannelEEE@Base 0.9.5
+#MISSING: 0.9.8+ds-4# _ZTIN2Tp14ChannelFactory12SubclassCtorINS_27IncomingFileTransferChannelEEE@Base 0.9.5
+#MISSING: 0.9.8+ds-4# _ZTIN2Tp14ChannelFactory12SubclassCtorINS_27OutgoingFileTransferChannelEEE@Base 0.9.5
+#MISSING: 0.9.8+ds-4# _ZTIN2Tp14ChannelFactory12SubclassCtorINS_27ServerAuthenticationChannelEEE@Base 0.9.5
+#MISSING: 0.9.8+ds-4# _ZTIN2Tp14ChannelFactory12SubclassCtorINS_7ChannelEEE@Base 0.9.5
  _ZTIN2Tp14ChannelFactoryE@Base 0.9.5
  _ZTIN2Tp14ChannelRequestE@Base 0.9.5
  _ZTIN2Tp14ContactFactoryE@Base 0.9.5
@@ -4555,7 +4555,7 @@
  _ZTVN2Tp10AccountSetE@Base 0.9.5
  _ZTVN2Tp10CallStreamE@Base 0.9.5
  _ZTVN2Tp10ConnectionE@Base 0.9.5
- _ZTVN2Tp10RefCountedE@Base 0.9.5
+#MISSING: 0.9.8+ds-4# _ZTVN2Tp10RefCountedE@Base 0.9.5
  _ZTVN2Tp11CallChannelE@Base 0.9.5
  _ZTVN2Tp11CallContentE@Base 0.9.5
  _ZTVN2Tp11PendingVoidE@Base 0.9.5
@@ -4569,20 +4569,20 @@
  _ZTVN2Tp14AbstractClientE@Base 0.9.5
  _ZTVN2Tp14AccountFactoryE@Base 0.9.5
  _ZTVN2Tp14AccountManagerE@Base 0.9.5
- (optional)_ZTVN2Tp14ChannelFactory11ConstructorE@Base 0.9.8
- _ZTVN2Tp14ChannelFactory12SubclassCtorINS_11CallChannelEEE@Base 0.9.5
- _ZTVN2Tp14ChannelFactory12SubclassCtorINS_11TextChannelEEE@Base 0.9.5
- _ZTVN2Tp14ChannelFactory12SubclassCtorINS_15RoomListChannelEEE@Base 0.9.5
- _ZTVN2Tp14ChannelFactory12SubclassCtorINS_20ContactSearchChannelEEE@Base 0.9.5
- _ZTVN2Tp14ChannelFactory12SubclassCtorINS_20StreamedMediaChannelEEE@Base 0.9.5
- _ZTVN2Tp14ChannelFactory12SubclassCtorINS_23IncomingDBusTubeChannelEEE@Base 0.9.5
- _ZTVN2Tp14ChannelFactory12SubclassCtorINS_23OutgoingDBusTubeChannelEEE@Base 0.9.5
- _ZTVN2Tp14ChannelFactory12SubclassCtorINS_25IncomingStreamTubeChannelEEE@Base 0.9.5
- _ZTVN2Tp14ChannelFactory12SubclassCtorINS_25OutgoingStreamTubeChannelEEE@Base 0.9.5
- _ZTVN2Tp14ChannelFactory12SubclassCtorINS_27IncomingFileTransferChannelEEE@Base 0.9.5
- _ZTVN2Tp14ChannelFactory12SubclassCtorINS_27OutgoingFileTransferChannelEEE@Base 0.9.5
- _ZTVN2Tp14ChannelFactory12SubclassCtorINS_27ServerAuthenticationChannelEEE@Base 0.9.5
- _ZTVN2Tp14ChannelFactory12SubclassCtorINS_7ChannelEEE@Base 0.9.5
+#MISSING: 0.9.8+ds-4# (optional)_ZTVN2Tp14ChannelFactory11ConstructorE@Base 0.9.8
+#MISSING: 0.9.8+ds-4# _ZTVN2Tp14ChannelFactory12SubclassCtorINS_11CallChannelEEE@Base 0.9.5
+#MISSING: 0.9.8+ds-4# _ZTVN2Tp14ChannelFactory12SubclassCtorINS_11TextChannelEEE@Base 0.9.5
+#MISSING: 0.9.8+ds-4# _ZTVN2Tp14ChannelFactory12SubclassCtorINS_15RoomListChannelEEE@Base 0.9.5
+#MISSING: 0.9.8+ds-4# _ZTVN2Tp14ChannelFactory12SubclassCtorINS_20ContactSearchChannelEEE@Base 0.9.5
+#MISSING: 0.9.8+ds-4# _ZTVN2Tp14ChannelFactory12SubclassCtorINS_20StreamedMediaChannelEEE@Base 0.9.5
+#MISSING: 0.9.8+ds-4# _ZTVN2Tp14ChannelFactory12SubclassCtorINS_23IncomingDBusTubeChannelEEE@Base 0.9.5
+#MISSING: 0.9.8+ds-4# _ZTVN2Tp14ChannelFactory12SubclassCtorINS_23OutgoingDBusTubeChannelEEE@Base 0.9.5
+#MISSING: 0.9.8+ds-4# _ZTVN2Tp14ChannelFactory12SubclassCtorINS_25IncomingStreamTubeChannelEEE@Base 0.9.5
+#MISSING: 0.9.8+ds-4# _ZTVN2Tp14ChannelFactory12SubclassCtorINS_25OutgoingStreamTubeChannelEEE@Base 0.9.5
+#MISSING: 0.9.8+ds-4# _ZTVN2Tp14ChannelFactory12SubclassCtorINS_27IncomingFileTransferChannelEEE@Base 0.9.5
+#MISSING: 0.9.8+ds-4# _ZTVN2Tp14ChannelFactory12SubclassCtorINS_27OutgoingFileTransferChannelEEE@Base 0.9.5
+#MISSING: 0.9.8+ds-4# _ZTVN2Tp14ChannelFactory12SubclassCtorINS_27ServerAuthenticationChannelEEE@Base 0.9.5
+#MISSING: 0.9.8+ds-4# _ZTVN2Tp14ChannelFactory12SubclassCtorINS_7ChannelEEE@Base 0.9.5
  _ZTVN2Tp14ChannelFactoryE@Base 0.9.5
  _ZTVN2Tp14ChannelRequestE@Base 0.9.5
  _ZTVN2Tp14ContactFactoryE@Base 0.9.5
dpkg-gensymbols: warning: some new symbols appeared in the symbols file: see diff output below
dpkg-gensymbols: warning: debian/libtelepathy-qt5-farstream0/DEBIAN/symbols doesn't match completely debian/libtelepathy-qt5-farstream0.symbols
--- debian/libtelepathy-qt5-farstream0.symbols (libtelepathy-qt5-farstream0_0.9.8+ds-4_amd64)
+++ dpkg-gensymbols9nIqWf	2022-06-10 08:49:53.203991972 +0000
@@ -11,5 +11,6 @@
  _ZNK2Tp9Farstream14PendingChannel11callChannelEv@Base 0.9.5
  _ZNK2Tp9Farstream14PendingChannel9tfChannelEv@Base 0.9.5
  _ZTIN2Tp9Farstream14PendingChannelE@Base 0.9.5
+ _ZTSN2Tp10RefCountedE@Base 0.9.8+ds-4
  _ZTSN2Tp9Farstream14PendingChannelE@Base 0.9.5
  _ZTVN2Tp9Farstream14PendingChannelE@Base 0.9.5
dh_makeshlibs: error: failing due to earlier errors
make: *** [debian/rules:11: binary] Error 25
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2

We believe that the bug you reported is fixed in the latest version of
telepathy-qt, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1015685@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Andres Salomon <dilinger@debian.org> (supplier of updated telepathy-qt package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Tue, 12 May 2026 20:57:55 -0400
Source: telepathy-qt
Architecture: source
Version: 0.9.8+git16.g04302908-3
Distribution: unstable
Urgency: medium
Maintainer: Debian UBports Team <team+ubports@tracker.debian.org>
Changed-By: Andres Salomon <dilinger@debian.org>
Closes: 1015685
Changes:
 telepathy-qt (0.9.8+git16.g04302908-3) unstable; urgency=medium
 .
   * Explicitly disable LTO due to ABI breakage (closes: #1015685).
   * Update Vcs in d/control for new path.
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