[Bug c++/55335] New: [DR 5] cv-qualifiers of destination type in copy-initialization

[Bug c++/55335] New: [DR 5] cv-qualifiers of destination type in copy-initialization

[ai.azuma at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55335

             Bug #: 55335
           Summary: [DR 5] cv-qualifiers of destination type in
                    copy-initialization
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: ai.azuma@gmail.com


Created attachment 28694
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28694
Output of -v option and preprocessed file with GCC 4.8.0 20121111

The following valid code is rejected by GCC 4.6.4 20121109, 4.7.3 20121110 and
4.8.0 20121111.

/////////////////////////
struct C{};

struct A {
  A(const A&){};
  A(const C&){};
};

int main()
{
  C c;
  const volatile A a = c;
}
/////////////////////////

For the above code, GCC 4.8.0 20121111 complains as follows;

main.cpp: In function 'int main()':
main.cpp:11:24: error: no matching function for call to 'A::A(const volatile
A)'
   const volatile A a = c;
                        ^
main.cpp:11:24: note: candidates are:
main.cpp:5:3: note: A::A(const C&)
   A(const C&){};
   ^
main.cpp:5:3: note:   no known conversion for argument 1 from 'const volatile
A' to 'const C&'
main.cpp:4:3: note: A::A(const A&)
   A(const A&){};
   ^
main.cpp:4:3: note:   no known conversion for argument 1 from 'const volatile
A' to 'const A&'

As far as I can guess from the error message, GCC does not seem to implement
the proposed resolution of DR 5.
http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#5

[Bug c++/55335] [DR 5] cv-qualifiers of destination type in copy-initialization

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55335

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |DUPLICATE
   Target Milestone|---                         |4.9.1

--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> ---
This is fixed in 4.9.1.

*** This bug has been marked as a duplicate of bug 60019 ***