Bug#811855: singular: FTBFS with GCC 6: no matching function for call to

[Martin Michlmayr]

Package: singular
Version: 4.0.2-p2+ds-3
Severity: important
User: debian-gcc at lists.debian.org
Usertags: ftbfs-gcc-6 gcc-6-no-match

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
...
> libtool: compile:  g++ -DHAVE_CONFIG_H -I. -I../../.. -I. -I../../.. -I../../.. -I../../../libpolys -I../../../libpolys -I/<<BUILDDIR>>/singular-4.0.2-p2+ds -I/<<BUILDDIR>>/singular-4.0.2-p2+ds/factory/include -I/<<BUILDDIR>>/singular-4.0.2-p2+ds -I/<<BUILDDIR>>/singular-4.0.2-p2+ds -DDYNAMIC_VERSION -DGMPRATIONAL -Wdate-time -D_FORTIFY_SOURCE=2 -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -pipe -fno-common -O3 -Wno-unused-function -Wno-trigraphs -Wno-unused-parameter -Wunknown-pragmas -Wno-unused-variable -fomit-frame-pointer -fwrapv -fvisibility=default -finline-functions -fno-exceptions -fno-rtti -fno-threadsafe-statics -fno-enforce-eh-specs -fconserve-space -funroll-loops -fexceptions -frtti -c lift.cc -o gfanlib_la-lift.o >/dev/null 2>&1
> ppinitialReduction.cc: In function 'bool ppreduceInitially(sip_sideal*&, number, ideal, ring)':
> ppinitialReduction.cc:675:46: error: no matching function for call to 'make_pair(int&, int)'
>        T.push_back(std::make_pair<int,int>(i,1));
>                                               ^
> 
> In file included from /usr/include/c++/6/bits/stl_algobase.h:64:0,
>                  from /usr/include/c++/6/vector:60,
>                  from ../../../gfanlib/gfanlib_vector.h:11,
>                  from ./tropicalStrategy.h:4,
>                  from ppinitialReduction.h:5,
>                  from ppinitialReduction.cc:5:
> /usr/include/c++/6/bits/stl_pair.h:406:5: note: candidate: template<class _T1, class _T2> constexpr std::pair<typename std::__decay_and_strip<_Tp>::__type, typename std::__decay_and_strip<_T2>::__type> std::make_pair(_T1&&, _T2&&)
>      make_pair(_T1&& __x, _T2&& __y)
>      ^~~~~~~~~
> 
> /usr/include/c++/6/bits/stl_pair.h:406:5: note:   template argument deduction/substitution failed:
> ppinitialReduction.cc:675:46: note:   cannot convert 'i' (type 'int') to type 'int&&'
>        T.push_back(std::make_pair<int,int>(i,1));
>                                               ^
> 
> tropicalStrategy.cc: In constructor 'tropicalStrategy::tropicalStrategy()':
> tropicalStrategy.cc:891:27: warning: converting to non-pointer type 'int' from NULL [-Wconversion-null]
>    onlyLowerHalfSpace(false)
>                            ^
> 
> Makefile:640: recipe for target 'gfanlib_la-ppinitialReduction.lo' failed

-- 
Martin Michlmayr
Linux for HPE Helion, Hewlett Packard Enterprise