[Bug c++/17938] New: cannot assign result to const reference if copy ctor is not accessible

["bryner at brianryner dot com" <gcc-bugzilla at gcc dot gnu dot org>]

This code fails to compile on current mainline:

-------------
class A
{
  A(const A&);
};
 
const A GetA();
 
void caller()
{
  const A& a = GetA();
}
-----------------------------

with this error:

access-const-ref.cpp: In function `void caller()':
access-const-ref.cpp:3: error: 'A::A(const A&)' is private
access-const-ref.cpp:10: error: within this context

It compiles fine on gcc 3.3.3.  compiler version:

$ gcc -v
Reading specs from /usr/gcc4/lib/gcc/i686-pc-linux-gnu/4.0.0/specs
Configured with: ../gcc/configure --prefix=/usr/gcc4 --enable-shared
--enable-threads=posix --enable-checking=release --with-system-zlib
--enable-__cxa_atexit --disable-libunwind-exceptions --disable-libgcj
--enable-languages=c,c++
Thread model: posix
gcc version 4.0.0 20041011 (experimental)

-- 
           Summary: cannot assign result to const reference if copy ctor is
                    not accessible
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: bryner at brianryner dot com
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17938