Bug#811990: linbox: FTBFS with GCC 6: call overloaded is ambiguous

[Martin Michlmayr]

Package: linbox
Version: 1.3.2-1.1
Severity: important
User: debian-gcc at lists.debian.org
Usertags: ftbfs-gcc-6 gcc-6-overloaded-ambiguous

This package fails to build with GCC 6.  GCC 6 has not been released
yet, but it's expected that GCC 6 will become the default compiler for
stretch.

Note that only the first error is reported; there might be more.  You
can find a snapshot of GCC 6 in experimental.  To build with GCC 6,
you can set CC=gcc-6 CXX=g++-6 explicitly.

You may be able to find out more about this issue at
https://gcc.gnu.org/gcc-6/changes.html

> sbuild (Debian sbuild) 0.67.0 (26 Dec 2015) on dl580gen9-02.hlinux
...
> /bin/bash ../../libtool  --tag=CXX   --mode=compile g++ -DHAVE_CONFIG_H -I. -I../..   -Wdate-time -D_FORTIFY_SOURCE=2 -O2    -g -DNDEBUG -U_LB_DEBUG -DDISABLE_COMMENTATOR   -I/usr/include/x86_64-linux-gnu      -I/usr/include/x86_64-linux-gnu -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -c -o diophantine-solver.lo diophantine-solver.C
> libtool: compile:  g++ -DHAVE_CONFIG_H -I. -I../.. -Wdate-time -D_FORTIFY_SOURCE=2 -O2 -g -DNDEBUG -U_LB_DEBUG -DDISABLE_COMMENTATOR -I/usr/include/x86_64-linux-gnu -I/usr/include/x86_64-linux-gnu -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -c diophantine-solver.C  -fPIC -DPIC -o .libs/diophantine-solver.o
> In file included from ../../linbox/vector/vector-domain-gf2.h:59:0,
>                  from ../../linbox/vector/vector-domain.h:1293,
>                  from ../../linbox/matrix/matrix-domain.h:42,
>                  from ../../linbox/matrix/sparse.h:75,
>                  from ../../linbox/blackbox/sparse.h:57,
>                  from ../../linbox/blackbox/lambda-sparse.h:29,
>                  from ../../linbox/algorithms/rational-solver.h:43,
>                  from ../../linbox/algorithms/diophantine-solver.h:29,
>                  from diophantine-solver.C:25:
> ../../linbox/field/gf2.h: In function 'void std::swap(std::_Bit_reference, std::_Bit_reference)':
> ../../linbox/field/gf2.h:985:14: error: redefinition of 'void std::swap(std::_Bit_reference, std::_Bit_reference)'
>   inline void swap(stdBitReference __x, stdBitReference __y)
>               ^~~~
> 
> In file included from /usr/include/c++/6/vector:65:0,
>                  from ../../linbox/util/debug.h:42,
>                  from ../../linbox/algorithms/rational-solver.h:38,
>                  from ../../linbox/algorithms/diophantine-solver.h:29,
>                  from diophantine-solver.C:25:
> /usr/include/c++/6/bits/stl_bvector.h:112:3: note: 'void std::swap(std::_Bit_reference, std::_Bit_reference)' previously defined here
>    swap(_Bit_reference __x, _Bit_reference __y) noexcept
>    ^~~~
> 
> In file included from ../../linbox/matrix/blas-matrix.h:1196:0,
>                  from ../../linbox/blackbox/compose.h:34,
>                  from ../../linbox/algorithms/rational-solver.h:44,
>                  from ../../linbox/algorithms/diophantine-solver.h:29,
>                  from diophantine-solver.C:25:
> ../../linbox/matrix/blas-matrix.inl: In member function 'void LinBox::BlasMatrix<_Field>::transpose()':
> ../../linbox/matrix/blas-matrix.inl:866:24: error: call of overloaded 'swap(size_t&, size_t&)' is ambiguous
>      std::swap(_row,_col);
>                         ^