[Rsbackup-maint] Bug#897852: rsbackup: ftbfs with GCC-8

[Matthias Klose]

Package: src:rsbackup
Version: 5.0-1
Severity: normal
Tags: sid buster
User: debian-gcc at lists.debian.org
Usertags: ftbfs-gcc-8

Please keep this issue open in the bug tracker for the package it
was filed for.  If a fix in another package is required, please
file a bug for the other package (or clone), and add a block in this
package. Please keep the issue open until the package can be built in
a follow-up test rebuild.

The package fails to build in a test rebuild on at least amd64 with
gcc-8/g++-8, but succeeds to build with gcc-7/g++-7. The
severity of this report will be raised before the buster release.

The full build log can be found at:
http://aws-logs.debian.net/2018/05/01/gcc8/rsbackup_5.0-1_unstable_gcc8.log.gz
The last lines of the build log are at the end of this report.

To build with GCC 8, either set CC=gcc-8 CXX=g++-8 explicitly,
or install the gcc, g++, gfortran, ... packages from experimental.

  apt-get -t=experimental install g++ 

Common build failures are new warnings resulting in build failures with
-Werror turned on, or new/dropped symbols in Debian symbols files.
For other C/C++ related build failures see the porting guide at
http://gcc.gnu.org/gcc-8/porting_to.html

[...]
  CXX      HTML.o
  CXX      IO.o
  CXX      MakeBackup.o
  CXX      Progress.o
  CXX      Prune.o
  CXX      Report.o
  CXX      RetireDevices.o
  CXX      RetireVolumes.o
  CXX      Store.o
  CXX      stylesheet.o
  CXX      Subprocess.o
  CXX      Text.o
  CXX      Unicode.o
  CXX      Volume.o
  CXX      ConfBase.o
  CXX      toLines.o
  CXX      globFiles.o
  CXX      Database.o
  CXX      parseInteger.o
  CXX      split.o
  CXX      EventLoop.o
  CXX      nonblock.o
  CXX      Action.o
  CXX      Selection.o
  CXX      Color.o
  CXX      parseFloat.o
  CXX      Render.o
In file included from /usr/include/sigc++-2.0/sigc++/sigc++.h:104,
                 from /usr/include/pangomm-1.4/pangomm/layout.h:7,
                 from Render.h:23,
                 from Render.cc:16:
/usr/include/sigc++-2.0/sigc++/signal.h: In static member function ‘static sigc::internal::signal_emit0<void, sigc::nil>::result_type sigc::internal::signal_emit0<void, sigc::nil>::emit(sigc::internal::signal_impl*)’:
/usr/include/sigc++-2.0/sigc++/signal.h:798:56: error: cast between incompatible function types from ‘sigc::internal::hook’ {aka ‘void* (*)(void*)’} to ‘sigc::internal::signal_emit0<void, sigc::nil>::call_type’ {aka ‘void (*)(sigc::internal::slot_rep*)’} [-Werror=cast-function-type]
           (reinterpret_cast<call_type>(slot.rep_->call_))(slot.rep_);
                                                        ^
/usr/include/sigc++-2.0/sigc++/signal.h: In static member function ‘static sigc::internal::signal_emit0<void, sigc::nil>::result_type sigc::internal::signal_emit0<void, sigc::nil>::emit_reverse(sigc::internal::signal_impl*)’:
/usr/include/sigc++-2.0/sigc++/signal.h:825:55: error: cast between incompatible function types from ‘sigc::internal::hook’ {aka ‘void* (*)(void*)’} to ‘sigc::internal::signal_emit0<void, sigc::nil>::call_type’ {aka ‘void (*)(sigc::internal::slot_rep*)’} [-Werror=cast-function-type]
           (reinterpret_cast<call_type>(it->rep_->call_))(it->rep_);
                                                       ^
At global scope:
cc1plus: error: unrecognized command line option ‘-Wno-c++14-extensions’ [-Werror]
cc1plus: all warnings being treated as errors
make[3]: *** [Makefile:1065: Render.o] Error 1
make[3]: Leaving directory '/<<PKGBUILDDIR>>/src'
make[2]: *** [Makefile:419: all-recursive] Error 1
make[2]: Leaving directory '/<<PKGBUILDDIR>>'
make[1]: *** [Makefile:360: all] Error 2
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
make: *** [debian/rules:36: build] Error 2
dpkg-buildpackage: error: debian/rules build-arch subprocess returned exit status 2