Bug#811843: colpack: FTBFS with GCC 6: no match for

[Martin Michlmayr]

Package: colpack
Version: 1.0.9-3.2
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. -O5 -I./Main -I./Utilities -I./BipartiteGraphPartialColoring -I./BipartiteGraphBicoloring -I./GraphColoring -I./Recovery -Wdate-time -D_FORTIFY_SOURCE=2 -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -c Utilities/StringTokenizer.cpp -o Utilities/StringTokenizer.o >/dev/null 2>&1
> Utilities/extra.cpp: In function 'int WriteMatrixMarket_ADOLCInput(std::__cxx11::string, int, ...)':
> Utilities/extra.cpp:52:37: error: no match for 'operator<<' (operand types are 'std::basic_ostream<char>' and 'std::ofstream {aka std::basic_ofstream<char>}')
>       cout<<"Error creating file: \""<<out_Matrix<<"\""<<endl;
>       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
> 
> Utilities/extra.cpp:52:37: note: candidate: operator<<(int, int) <built-in>
> Utilities/extra.cpp:52:37: note:   no known conversion for argument 2 from 'std::ofstream {aka std::basic_ofstream<char>}' to 'int'
> In file included from /usr/include/c++/6/iostream:39:0,
>                  from Utilities/extra.h:24,
>                  from Utilities/extra.cpp:24:
> /usr/include/c++/6/ostream:108:7: note: candidate: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostream<_CharT, _Traits>::__ostream_type& (*)(std::basic_ostream<_CharT, _Traits>::__ostream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
>        operator<<(__ostream_type& (*__pf)(__ostream_type&))
>        ^~~~~~~~
> 
> /usr/include/c++/6/ostream:108:7: note:   no known conversion for argument 1 from 'std::ofstream {aka std::basic_ofstream<char>}' to 'std::basic_ostream<char>::__ostream_type& (*)(std::basic_ostream<char>::__ostream_type&) {aka std::basic_ostream<char>& (*)(std::basic_ostream<char>&)}'
> /usr/include/c++/6/ostream:117:7: note: candidate: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostream<_CharT, _Traits>::__ios_type& (*)(std::basic_ostream<_CharT, _Traits>::__ios_type&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>; std::basic_ostream<_CharT, _Traits>::__ios_type = std::basic_ios<char>]
>        operator<<(__ios_type& (*__pf)(__ios_type&))
>        ^~~~~~~~
> 
> /usr/include/c++/6/ostream:117:7: note:   no known conversion for argument 1 from 'std::ofstream {aka std::basic_ofstream<char>}' to 'std::basic_ostream<char>::__ios_type& (*)(std::basic_ostream<char>::__ios_type&) {aka std::basic_ios<char>& (*)(std::basic_ios<char>&)}'
> /usr/include/c++/6/ostream:127:7: note: candidate: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(std::ios_base& (*)(std::ios_base&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
>        operator<<(ios_base& (*__pf) (ios_base&))
>        ^~~~~~~~