[Aptitude-devel] Bug#966875: Bug#966875: aptitude: FTBFS: ../../../../src/generic/views/download_progress.cc:49:11: error: no match for ‘operator<<’ (operand types are ‘std::ostream’ {aka ‘std::basic_ostream<char>’} and ‘const char =?UTF-8?Q?[17]=E2=80=99?=)

[Axel Beckert]

Hi Lucas,

thanks for the bug report.

I first thought this seems to have changed with gcc 10.2 instead 10.1
since I had gcc 10 as default locally for quite while before it became
default. But at least my last local 0.8.13-1 build was done with still
gcc 9.

Also verified that it's not just an issue between gcc 10.1 and 10.2 by
downgrading gcc-10 and friends to 10.1.0-6 from testing: Didn't fix
this. So it might be a general FTBFS with gcc 10 — although I'm
surprised this didn't came up earlier.

Lucas Nussbaum wrote:
> Relevant part (hopefully):

Seems to boil down to these:

→ fgrep "no known conversion" ../aptitude_0.8.13-2_amd64.build | sort -u
../../../../src/generic/views/download_progress.cc:47:89: note:   no known conversion for argument 2 from ‘const char [10]’ to ‘const aptitude::views::download_progress::file_progress&’
../../../../src/generic/views/download_progress.cc:47:89: note:   no known conversion for argument 2 from ‘const char [17]’ to ‘const aptitude::views::download_progress::file_progress&’
../../../../src/generic/views/download_progress.cc:47:89: note:   no known conversion for argument 2 from ‘const char [18]’ to ‘const aptitude::views::download_progress::file_progress&’
../../../../src/generic/views/download_progress.cc:47:89: note:   no known conversion for argument 2 from ‘const char [2]’ to ‘const aptitude::views::download_progress::file_progress&’
../../../../src/generic/views/download_progress.cc:47:89: note:   no known conversion for argument 2 from ‘const char [3]’ to ‘const aptitude::views::download_progress::file_progress&’
../../../../src/generic/views/download_progress.cc:47:89: note:   no known conversion for argument 2 from ‘const char [6]’ to ‘const aptitude::views::download_progress::file_progress&’
../../../../src/generic/views/download_progress.cc:47:89: note:   no known conversion for argument 2 from ‘const char [7]’ to ‘const aptitude::views::download_progress::file_progress&’
../../../../src/generic/views/download_progress.cc:47:89: note:   no known conversion for argument 2 from ‘const long unsigned int’ to ‘const aptitude::views::download_progress::file_progress&’
../../../../src/generic/views/download_progress.cc:97:63: note:   no known conversion for argument 2 from ‘const char [18]’ to ‘const aptitude::views::download_progress::status&’
../../../../src/generic/views/download_progress.cc:97:63: note:   no known conversion for argument 2 from ‘const char [2]’ to ‘const aptitude::views::download_progress::status&’
../../../../src/generic/views/download_progress.cc:97:63: note:   no known conversion for argument 2 from ‘const char [3]’ to ‘const aptitude::views::download_progress::status&’
../../../../src/generic/views/download_progress.h:271:63: note:   no known conversion for argument 2 from ‘const char [10]’ to ‘const aptitude::views::download_progress::status&’
../../../../src/generic/views/download_progress.h:271:63: note:   no known conversion for argument 2 from ‘const char [17]’ to ‘const aptitude::views::download_progress::status&’
../../../../src/generic/views/download_progress.h:271:63: note:   no known conversion for argument 2 from ‘const char [2]’ to ‘const aptitude::views::download_progress::status&’
../../../../src/generic/views/download_progress.h:271:63: note:   no known conversion for argument 2 from ‘const char [6]’ to ‘const aptitude::views::download_progress::status&’
../../../../src/generic/views/download_progress.h:271:63: note:   no known conversion for argument 2 from ‘const char [7]’ to ‘const aptitude::views::download_progress::status&’
../../../../src/generic/views/download_progress.h:271:63: note:   no known conversion for argument 2 from ‘const long unsigned int’ to ‘const aptitude::views::download_progress::status&’

And this seems to be the hints what might help:

→ fgrep "candidate" ../aptitude_0.8.13-2_amd64.build | sort -u
../../../../src/generic/views/download_progress.cc:47:19: note: candidate: ‘std::ostream& aptitude::views::operator<<(std::ostream&, const aptitude::views::download_progress::file_progress&)’
../../../../src/generic/views/download_progress.cc:96:19: note: candidate: ‘std::ostream& aptitude::views::operator<<(std::ostream&, const aptitude::views::download_progress::status&)’
../../../../src/generic/views/download_progress.h:270:19: note: candidate: ‘std::ostream& aptitude::views::operator<<(std::ostream&, const aptitude::views::download_progress::status&)’
/usr/include/c++/10/bits/basic_string.h:6458:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>&)’
/usr/include/c++/10/bits/shared_ptr.h:69:5: note: candidate: ‘template<class _Ch, class _Tr, class _Tp, __gnu_cxx::_Lock_policy _Lp> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::__shared_ptr<_Tp, _Lp>&)’
/usr/include/c++/10/cstddef:125:5: note: candidate: ‘template<class _IntegerType> constexpr std::__byte_op_t<_IntegerType> std::operator<<(std::byte, _IntegerType)’
/usr/include/c++/10/string_view:622:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::basic_string_view<_CharT, _Traits>)’
/usr/include/c++/10/system_error:262:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::error_code&)’

Admittedly my C++ knowledge doesn't go deep enough to understand where
I might put these. Hopefully Manuel or someone else can chime in.

		Regards, Axel
-- 
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