Bug#1133597: openturns: ftbfs with GCC-16

[Emanuele Rocca]

Package: src:openturns
Version: 1.26-4
Severity: important
Tags: sid forky ftbfs
User: debian-gcc at lists.debian.org
Usertags: ftbfs-gcc-16

Hi,

openturns 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/openturns_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 with GCC 16.

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.

[...]


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In file included from /usr/include/c++/16/bits/stl_algobase.h:70,
                 from /usr/include/c++/16/bits/specfun.h:44,
                 from /usr/include/c++/16/cmath:3913,
                 from /usr/include/c++/16/math.h:36,
                 from /usr/include/python3.13/Python.h:23,
                 from /build/reproducible-path/openturns-1.26/builddir/python/src/CMakeFiles/typ.dir/typ_modulePYTHON_wrap.cxx:203:
/usr/include/c++/16/bits/predefined_ops.h: In instantiation of ‘constexpr bool __gnu_cxx::__ops::_Comp_with_val<_Func, _Value, _Val_2nd>::operator()(_Tp&&) [with _Tp = const OT::CovarianceMatrix&; _Func = std::equal_to<void>; _Value = OT::CovarianceMatrix; bool _Val_2nd = true]’:
/usr/include/c++/16/bits/stl_algobase.h:2102:42:   required from ‘constexpr _Iterator std::__find_if(_Iterator, _Iterator, _Predicate) [with _Iterator = __gnu_cxx::__normal_iterator<const OT::CovarianceMatrix*, vector<OT::CovarianceMatrix, allocator<OT::CovarianceMatrix> > >; _Predicate = __gnu_cxx::__ops::_Comp_with_val<equal_to<void>, OT::CovarianceMatrix, true>]’
 2102 |       while (__first != __last && !__pred(*__first))
      |                                    ~~~~~~^~~~~~~~~~
/usr/include/c++/16/bits/stl_algo.h:3876:28:   required from ‘constexpr _IIter std::find(_IIter, _IIter, const _Tp&) [with _IIter = __gnu_cxx::__normal_iterator<const OT::CovarianceMatrix*, vector<OT::CovarianceMatrix, allocator<OT::CovarianceMatrix> > >; _Tp = OT::CovarianceMatrix]’
 3876 |       return std::__find_if(__first, __last,
      |              ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
 3877 |                             __gnu_cxx::__ops::__equal_to(__val));
      |                             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/build/reproducible-path/openturns-1.26/lib/src/Base/Type/openturns/Collection.hxx:230:22:   required from ‘OT::Bool OT::Collection<T>::contains(T) const [with T = OT::CovarianceMatrix; OT::Bool = bool]’
  230 |     return (std::find(begin(), end(), val) != end());
      |             ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
/build/reproducible-path/openturns-1.26/builddir/python/src/CMakeFiles/typ.dir/typ_modulePYTHON_wrap.cxx:66546:90:   required from here
66546 |       result = (OT::Bool)((OT::Collection< OT::CovarianceMatrix > const *)arg1)->contains(SWIG_STD_MOVE(arg2));
      |                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/16/bits/predefined_ops.h:81:24: error: no match for call to ‘(__gnu_cxx::__ops::_Comp_with_val<std::equal_to<void>, OT::CovarianceMatrix, true>::_Fn) (const OT::CovarianceMatrix&, const OT::CovarianceMatrix&)’
   81 |             return _M_f(__arg, _M_val);
      |                    ~~~~^~~~~~~~~~~~~~~
In file included from /usr/include/c++/16/bits/predefined_ops.h:33:
  • there is 1 candidate
    /usr/include/c++/16/bits/stl_function.h:495:12:
      495 |     struct equal_to<void>
          |            ^~~~~~~~~~~~~~
    • candidate 1: ‘template<class _Tp, class _Up> constexpr decltype ((forward<_Tp>(__t) == forward<_Up>(__u))) std::equal_to<void>::operator()(_Tp&&, _Up&&) const’
      /usr/include/c++/16/bits/stl_function.h:499:9:
        499 |         operator()(_Tp&& __t, _Up&& __u) const
            |         ^~~~~~~~
      • template argument deduction/substitution failed:
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make[3]: *** [CMakeFiles/Makefile2:21788: python/src/CMakeFiles/typ.dir/all] Error 2
make[3]: Leaving directory '/build/reproducible-path/openturns-1.26/builddir'
make[2]: *** [Makefile:169: all] Error 2
make[2]: Leaving directory '/build/reproducible-path/openturns-1.26/builddir/python'
make[1]: *** [debian/rules:56: override_dh_auto_build] Error 2
make[1]: Leaving directory '/build/reproducible-path/openturns-1.26'
make: *** [debian/rules:39: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess failed with exit status 2