[Bug 1477299] Re: please fix building apt using gcc-snapshot

[Matthias Klose]

> Even through std=c++11 is the new default, right?

No. still the same as in 4.9. GCC 6 (currently gcc-snapshot) will
default to c++14. For GCC 5, please use a standard explicitly, if you
need it.

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https://bugs.launchpad.net/bugs/1477299

Title:
  please fix building apt using gcc-snapshot

Status in apt package in Ubuntu:
  Confirmed

Bug description:
  please fix building apt using gcc-snapshot. I'd like to check the
  possible wrong-code issue with the GCC trunk version. The build fails
  with:

  In file included from ../build/include/apt-pkg/algorithms.h:35:0,
                   from /scratch/doko/tmp/apt-1.0.9.10ubuntu4/cmdline/apt-get.cc:31:
  ../build/include/apt-pkg/depcache.h: In member function 'bool pkgDepCache::MarkAndSweep()':
  ../build/include/apt-pkg/depcache.h:406:11: warning: 'template<class> class std::auto_ptr' is deprecated [-Wd
  eprecated-declarations]
        std::auto_ptr<InRootSetFunc> f(GetRootSetFunc());
             ^
  In file included from /usr/lib/gcc-snapshot/include/c++/6.0.0/memory:81:0,
                   from ../build/include/apt-pkg/depcache.h:48,
                   from ../build/include/apt-pkg/algorithms.h:35,
                   from /scratch/doko/tmp/apt-1.0.9.10ubuntu4/cmdline/apt-get.cc:31:
  /usr/lib/gcc-snapshot/include/c++/6.0.0/bits/unique_ptr.h:49:28: note: declared here
     template<typename> class auto_ptr;
                              ^
  /scratch/doko/tmp/apt-1.0.9.10ubuntu4/cmdline/apt-get.cc: In function 'bool DoDownload(CommandLine&)':
  /scratch/doko/tmp/apt-1.0.9.10ubuntu4/cmdline/apt-get.cc:633:36: error: no matching function for call to 'APT::CacheSetHelper::CacheSetHelper(std::ostream&)'
      APT::CacheSetHelper helper(c0out);
                                      ^
  In file included from /scratch/doko/tmp/apt-1.0.9.10ubuntu4/cmdline/apt-get.cc:34:0:
  ../build/include/apt-pkg/cacheset.h:49:2: note: candidate: APT::CacheSetHelper::CacheSetHelper(bool, GlobalError::MsgType)
    CacheSetHelper(bool const ShowError = true,
    ^
  ../build/include/apt-pkg/cacheset.h:49:2: note:   no known conversion for argument 1 from 'std::ostream {aka std::basic_ostream<char>}' to 'bool'
  ../build/include/apt-pkg/cacheset.h:39:7: note: candidate: constexpr APT::CacheSetHelper::CacheSetHelper(const APT::CacheSetHelper&)
   class CacheSetHelper {       /*{{{*/
         ^

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