目前来看，bookworm应该默认使用gcc-12了，不过，从目前的QA质量来看，有不少C++包在rebuild时失败了。这篇文章就是简单的记录这个ftbfs summary. 其实做了这么多我发现，任何东西都不能浮于表面，也就是fix 一个issue,需要深挖背后的原理。当然，我现在的时间、资历还达不到那个级别，所以这个page就是当做笔记用的。
GCC 11 defaults to the GNU++17 standard.
指引性的文章here
其实大部分的ftbfs集中在这一块。
ftbfs
dbus-c++
http://qa-logs.debian.net/2022/06/09/gcc12/dbus-c++_0.9.0-9_unstable_gcc12.log
/usr/include/c++/12/iomanip:170:5: note: template argument deduction/substitution failed:
../../include/dbus-c++/types.h:96:8: note: ‘DBus::MessageIter’ is not derived from ‘std::basic_istream<_CharT, _Traits>’
96 | ri >> cast;
| ~~~^~~~~~~
/usr/include/c++/12/iomanip:200:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>&
+std::operator>>(basic_istream<_CharT, _Traits>&, _Setprecision)’
200 | operator>>(basic_istream<_CharT, _Traits>& __is, _Setprecision __f)
| ^~~~~~~~
/usr/include/c++/12/iomanip:200:5: note: template argument deduction/substitution failed:
../../include/dbus-c++/types.h:96:8: note: ‘DBus::MessageIter’ is not derived from ‘std::basic_istream<_CharT, _Traits>’
96 | ri >> cast;
| ~~~^~~~~~~
/usr/include/c++/12/iomanip:230:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>&
+std::operator>>(basic_istream<_CharT, _Traits>&, _Setw)’
230 | operator>>(basic_istream<_CharT, _Traits>& __is, _Setw __f)
| ^~~~~~~~
/usr/include/c++/12/iomanip:230:5: note: template argument deduction/substitution failed:
../../include/dbus-c++/types.h:96:8: note: ‘DBus::MessageIter’ is not derived from ‘std::basic_istream<_CharT, _Traits>’
96 | ri >> cast;
| ~~~^~~~~~~
/usr/include/c++/12/iomanip:264:5: note: candidate: ‘template<class _CharT, class _Traits, class _MoneyT> std::basic_istream<_CharT,
+_Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _Get_money<_MoneyT>)’
264 | operator>>(basic_istream<_CharT, _Traits>& __is, _Get_money<_MoneyT> __f)
Solutions: todo