Hi,

amoebax fails to build in a test rebuild on at least amd64 and arm64 with
gcc-16/g++-16, but builds properly with gcc-15/g++-15. The severity of this
report will be raised before the forky release.

The full build log can be found at:
https://people.debian.org/~ema/gcc-16-rebuilds/output-1/amoebax_arm64.build.xz

The last lines of the build log are at the end of this report.

To build with GCC 16, either set CC=gcc-16 CXX=g++-16 explicitly,
or install the gcc, g++, gfortran, ... packages from experimental.

  apt-get -t=experimental install g++

Common build failures include unused (but set) variables, array subscripts
partly outside array bounds, and new/dropped symbols in Debian symbols files.
For other C/C++ related build failures see the porting guide at
http://gcc.gnu.org/gcc-16/porting_to.html

Please only close this issue after double-checking that the package can be
built correctly.

Please do not reassign this bug to another package. If a fix in another package
is required, then file a bug for the other package (or clone), and mark this
bug as blocked by the bug in the other package.

[...]


TwoPlayersState.h:144:18: warning: ‘template<class> class std::auto_ptr’ is deprecated: use 'std::unique_ptr' instead [-Wdeprecated-declarations]
  144 |             std::auto_ptr<Surface> m_Ready;
      |                  ^~~~~~~~
/usr/include/c++/16/bits/unique_ptr.h:58:28: note: declared here
   58 |   template<typename> class auto_ptr;
      |                            ^~~~~~~~
TwoPlayersState.h:148:18: warning: ‘template<class> class std::auto_ptr’ is deprecated: use 'std::unique_ptr' instead [-Wdeprecated-declarations]
  148 |             std::auto_ptr<IPlayer> m_RightPlayer;
      |                  ^~~~~~~~
/usr/include/c++/16/bits/unique_ptr.h:58:28: note: declared here
   58 |   template<typename> class auto_ptr;
      |                            ^~~~~~~~
TwoPlayersState.h:150:18: warning: ‘template<class> class std::auto_ptr’ is deprecated: use 'std::unique_ptr' instead [-Wdeprecated-declarations]
  150 |             std::auto_ptr<Font> m_ScoreFont;
      |                  ^~~~~~~~
/usr/include/c++/16/bits/unique_ptr.h:58:28: note: declared here
   58 |   template<typename> class auto_ptr;
      |                            ^~~~~~~~
TwoPlayersState.h:154:18: warning: ‘template<class> class std::auto_ptr’ is deprecated: use 'std::unique_ptr' instead [-Wdeprecated-declarations]
  154 |             std::auto_ptr<Surface> m_Silhouettes;
      |                  ^~~~~~~~
/usr/include/c++/16/bits/unique_ptr.h:58:28: note: declared here
   58 |   template<typename> class auto_ptr;
      |                            ^~~~~~~~
TwoPlayersState.h:158:18: warning: ‘template<class> class std::auto_ptr’ is deprecated: use 'std::unique_ptr' instead [-Wdeprecated-declarations]
  158 |             std::auto_ptr<Surface> m_YouLose;
      |                  ^~~~~~~~
/usr/include/c++/16/bits/unique_ptr.h:58:28: note: declared here
   58 |   template<typename> class auto_ptr;
      |                            ^~~~~~~~
TwoPlayersState.h:160:18: warning: ‘template<class> class std::auto_ptr’ is deprecated: use 'std::unique_ptr' instead [-Wdeprecated-declarations]
  160 |             std::auto_ptr<Surface> m_YouWin;
      |                  ^~~~~~~~
/usr/include/c++/16/bits/unique_ptr.h:58:28: note: declared here
   58 |   template<typename> class auto_ptr;
      |                            ^~~~~~~~
In file included from TournamentState.cxx:32:
VersusState.h:59:18: warning: ‘template<class> class std::auto_ptr’ is deprecated: use 'std::unique_ptr' instead [-Wdeprecated-declarations]
   59 |             std::auto_ptr<Surface> m_Background;
      |                  ^~~~~~~~
/usr/include/c++/16/bits/unique_ptr.h:58:28: note: declared here
   58 |   template<typename> class auto_ptr;
      |                            ^~~~~~~~
VersusState.h:61:18: warning: ‘template<class> class std::auto_ptr’ is deprecated: use 'std::unique_ptr' instead [-Wdeprecated-declarations]
   61 |             std::auto_ptr<Music> m_BackgroundMusic;
      |                  ^~~~~~~~
/usr/include/c++/16/bits/unique_ptr.h:58:28: note: declared here
   58 |   template<typename> class auto_ptr;
      |                            ^~~~~~~~
TournamentState.cxx: In member function ‘void Amoebax::TournamentState::loadGraphicResources()’:
TournamentState.cxx:436:14: warning: ‘template<class> class std::auto_ptr’ is deprecated: use 'std::unique_ptr' instead [-Wdeprecated-declarations]
  436 |         std::auto_ptr<Surface> grid (
      |              ^~~~~~~~
/usr/include/c++/16/bits/unique_ptr.h:58:28: note: declared here
   58 |   template<typename> class auto_ptr;
      |                            ^~~~~~~~
In file included from main.cxx:29:
System.h:49:31: warning: ‘template<class _Arg, class _Result> struct std::unary_function’ is deprecated [-Wdeprecated-declarations]
   49 |     struct DeleteObject: std::unary_function <T, void>
      |                               ^~~~~~~~~~~~~~
/usr/include/c++/16/bits/stl_function.h:120:12: note: declared here
  120 |     struct unary_function
      |            ^~~~~~~~~~~~~~
make[3]: Leaving directory '/build/reproducible-path/amoebax-0.2.1+dfsg/src'
make[2]: *** [Makefile:255: all-recursive] Error 1
make[2]: Leaving directory '/build/reproducible-path/amoebax-0.2.1+dfsg'
make[1]: *** [Makefile:194: all] Error 2
make[1]: Leaving directory '/build/reproducible-path/amoebax-0.2.1+dfsg'
dh_auto_build: error: make -j128 returned exit code 2
make: *** [debian/rules:5: binary] Error 25
dpkg-buildpackage: error: debian/rules binary subprocess failed with exit status 2

/usr/include/c++/16/bits/stl_numeric.h: In instantiation of ‘constexpr _Tp std::accumulate(_InputIterator, _InputIterator, _Tp, _BinaryOperation) [with _InputIterator = __gnu_cxx::__normal_iterator<const char*, __cxx11::basic_string<char> >; _Tp = short unsigned int; _BinaryOperation = Amoebax::Font::TextWidth]’:
Font.cxx:71:28:   required from here
    71 |     return std::accumulate (text.begin (), text.end (),
       |            ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
    72 |                             static_cast<uint16_t>(0), TextWidth (this));
       |                             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/16/bits/stl_numeric.h:169:29: error: no match for call to ‘(Amoebax::Font::TextWidth) (std::remove_reference<short unsigned int&>::type, const char&)’
   169 |         __init = __binary_op(_GLIBCXX_MOVE_IF_20(__init), *__first);
       |                  ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   • there is 1 candidate
     Font.h:67:20:
        67 |             struct TextWidth:
           |                    ^~~~~~~~~
     • candidate 1: ‘uint16_t Amoebax::Font::TextWidth::operator()(uint16_t&, const char&)’ (near match)
       Font.h:98:17:
          98 |                 operator() (uint16_t &widthSoFar, const char ¤tCharacter)
             |                 ^~~~~~~~
       • conversion of argument 1 would be ill-formed:
       • error: cannot bind non-const lvalue reference of type ‘uint16_t&’ {aka ‘short unsigned int&’} to an rvalue of type ‘std::remove_reference<short unsigned int&>::type’ {aka ‘short unsigned int’}

(Someone who is better at C++ than me will have to solve this, sorry)

     smcv

tags 1132062 + patch
user debian-release@lists.debian.org
usertags 1132062 + bsp-2026-04-br-campinas
thanks

Thanks, Simon. I've proposed a patch to fix the issue with GCC 16 [1].
From what I tested, the build works with both C++17 and C++20.

I'm adding Jordi Fita in CC, since they are referenced as author in the
project webpage [2]. I will see if the e-mail can be successfully
delivered and then annotate the bug as forwarded accordingly if so.

[1] https://salsa.debian.org/games-team/amoebax/-/merge_requests/4
[2] https://www.emma-soft.com/games/amoebax/index.html

We believe that the bug you reported is fixed in the latest version of
amoebax, 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 1132062@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Alexandre Detiste <tchet@debian.org> (supplier of updated amoebax 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: Sun, 09 Aug 2026 13:48:28 +0200
Source: amoebax
Architecture: source
Version: 0.2.1+dfsg-8
Distribution: unstable
Urgency: medium
Maintainer: Debian Games Team <pkg-games-devel@lists.alioth.debian.org>
Changed-By: Alexandre Detiste <tchet@debian.org>
Closes: 1132062
Changes:
 amoebax (0.2.1+dfsg-8) unstable; urgency=medium
 .
   * Team Upload
   * Add debian/salsa-ci.yml
   * Bump Standards-Version to 4.7.4, drop Priority: tag
 .
   [ Henrique F. Simoes ]
   * Fix FTBFS with GCC 16 (Closes: #1132062)
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