Bug#987921: linbox FTBFS on 32bit with gcc 10

[Torrance, Douglas]

Control: forwarded -1 https://github.com/linbox-team/linbox/issues/273

On Sun 02 May 2021 12:46:50 AM EDT, Adrian Bunk wrote:
> Source: linbox
> Version: 1.6.3-2
> Severity: serious
> Tags: ftbfs
>
> https://tests.reproducible-builds.org/debian/rb-pkg/bullseye/i386/linbox.html
>
> ...
> In file included from ../linbox/algorithms/gauss-gf2.h:244,
>                  from test-qlup.C:44:
> ../linbox/algorithms/gauss/gauss-solve-gf2.inl: In instantiation of 'Vector1& LinBox::GaussDomain<LinBox::GF2>::solveInPlace(Vector1&, SparseSeqMatrix&, const Vector2&) const [with SparseSeqMatrix = LinBox::ZeroOne<LinBox::GF2>; Vector1 = LinBox::BitVector; Vector2 = LinBox::BitVector]':
> test-qlup.C:204:18:   required from 'bool testQLUPsolve(const Field&, size_t, unsigned int, int, double) [with Field = LinBox::GF2; Blackbox = LinBox::ZeroOne<LinBox::GF2>; RandStream = LinBox::RandomSparseStreamGF2<LinBox::LightContainer<unsigned int> >; size_t = unsigned int]'
> test-qlup.C:416:86:   required from here
> ../linbox/algorithms/gauss/gauss-solve-gf2.inl:75:52: error: ambiguous overload for 'operator+' (operand types are 'LinBox::BitVector::iterator' and 'std::ptrdiff_t' {aka 'int'})
>    75 |         for(typename Vector1::iterator it=w.begin()+(ptrdiff_t)Rank;it!=w.end();++it)
>       |                                           ~~~~~~~~~^~~~~~~~~~~~~~~~
> In file included from ../linbox/vector/bit-vector.h:191,
>                  from ../linbox/field/gf2.h:39,
>                  from ../linbox/vector/vector-domain-gf2.h:59,
>                  from ../linbox/vector/vector-domain.h:1336,
>                  from ../linbox/matrix/matrix-domain.h:35,
>                  from ../linbox/matrix/sparsematrix/sparse-generic.h:80,
>                  from ../linbox/matrix/sparse-matrix.h:70,
>                  from test-qlup.C:42:
> ../linbox/vector/bit-vector.inl:254:12: note: candidate: 'LinBox::BitVector::iterator LinBox::BitVector::iterator::operator+(LinBox::BitVector::iterator::difference_type) const'
>   254 |   iterator operator + (difference_type i) const
>       |            ^~~~~~~~
> In file included from /usr/include/c++/10/vector:68,
>                  from ../linbox/util/debug.h:42,
>                  from ../linbox/matrix/matrix-traits.h:29,
>                  from ../linbox/matrix/sparse-matrix.h:40,
>                  from test-qlup.C:42:
> /usr/include/c++/10/bits/stl_bvector.h:303:5: note: candidate: 'std::_Bit_iterator::iterator std::operator+(const iterator&, std::iterator<std::random_access_iterator_tag, bool>::difference_type)'
>   303 |     operator+(const iterator& __x, difference_type __n)
>       |     ^~~~~~~~
> ...

This has been reported upstream:
https://github.com/linbox-team/linbox/issues/273