http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39728
Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2012-04-15
CC| |manu at gcc dot gnu.org,
| |paolo.carlini at oracle dot
| |com
Ever Confirmed|0 |1
--- Comment #2 from Manuel López-Ibáñez <manu at gcc dot gnu.org> 2012-04-15
17:05:31 UTC ---
This is what Clang prints:
In file included from pr39728.C:1:
In file included from /usr/include/c++/4.3/fstream:44:
In file included from /usr/include/c++/4.3/istream:44:
In file included from /usr/include/c++/4.3/ios:49:
In file included from /usr/include/c++/4.3/bits/basic_ios.h:474:
/usr/include/c++/4.3/bits/basic_ios.tcc:182:25: error: 'operator=' is a private
member of 'std::ios_base'
extern template class basic_ios<char>;
^
/usr/include/c++/4.3/bits/ios_base.h:785:5: note: declared private here
operator=(const ios_base&);
^
/usr/include/c++/4.3/iosfwd:57:11: note: implicit default copy assignment
operator for 'std::basic_ios<char>' first required here
class basic_istream;
^
/usr/include/c++/4.3/bits/fstream.tcc:914:25: note: implicit default copy
assignment operator for 'std::basic_istream<char>' first required here
extern template class basic_ifstream<char>;
^
/usr/include/c++/4.3/bits/fstream.tcc:913:25: error: 'operator=' is a private
member of 'std::basic_streambuf<char>'
extern template class basic_filebuf<char>;
^
/usr/include/c++/4.3/streambuf:782:7: note: declared private here
operator=(const __streambuf_type&) { return *this; };
^
/usr/include/c++/4.3/bits/fstream.tcc:914:25: note: implicit default copy
assignment operator for 'std::basic_filebuf<char>' first required here
extern template class basic_ifstream<char>;
^
pr39728.C:10:5: note: implicit default copy assignment operator for
'std::basic_ifstream<char>' first required here
y = x;
^
2 errors generated.
Even with canonicalized paths, GCC diagnostic is awful. Several things wrong:
* Do not show "In member function", it clutters the output and it is duplicated
info because they are already mentioned in the note.
* What is a "synthesized method"? Where this term comes from? Is this something
that an average C++ programmer can understand?
* Avoid monsters like "std::basic_streambuf<_CharT, _Traits>::__streambuf_type&
std::basic_streambuf<_CharT, _Traits>::operator=(const __streambuf_type&) [with
_CharT = char; _Traits = std::char_traits<char>; std::basic_streambuf<_CharT,
_Traits>::__streambuf_type = std::basic_streambuf<char>]"
Following Ian's suggestion, it would be amazing if GCC emitted:
pr39728.C:10:5: error: cannot call implicit default copy assignment operator
for 'std::basic_ifstream<char>'
note: candidates are:
/usr/include/c++/4.3/streambuf:782:7: note: candidate #1 is implicit default
copy assignment operator for 'std::basic_filebuf<char>'
[...............] note: cannot be called because [reason]
/usr/include/c++/4.3/streambuf:782:7: note: candidate #1 is implicit default
copy assignment operator for 'std::basic_filebuf<char>'
[...............] note: cannot be called because [reason]
/usr/include/c++/4.3/bits/fstream.tcc:914:25: note: candidate #2 is implicit
default copy assignment operator for 'std::basic_istream<char>'
[...............] note: cannot be called because [reason]
I am sorry, I don't have time to fix all this, but I wish we had enough
developers to fix it, because it is a shame.
