[Bug c++/51139] New: c++11 alias-declarations doasn't work contrary to relase notes

[Bug c++/51139] New: c++11 alias-declarations doasn't work contrary to relase notes

[sp at comsulting dot de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51139

             Bug #: 51139
           Summary: c++11 alias-declarations doasn't work contrary to
                    relase notes
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: critical
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: sp@comsulting.de


According to the 4.7 release notes (http://gcc.gnu.org/gcc-4.7/changes.html)
the C++11 feature "alias-declarations" should work.

However I was not able to compile the example given in the release notes above:

-------------------------------------
template <class T> using Ptr = T*;
Ptr<int> ip;  // decltype(ip) is int*
-------------------------------------

I get this error:

---------------------------------------------
error: expected unqualified-id before 'using'
error: 'Ptr' does not name a type
---------------------------------------------

I tried the other C++11 examples like 

--------------------------------------------------------------------------------
constexpr long double operator"" _degrees (long double d) { return d * 0.0175;
}
long double pi = 180_degrees;
--------------------------------------------------------------------------------

and 

-----------------------------
struct A {
  int i = 42;
} a; // initializes a.i to 42
-----------------------------

which all work fine.

This is the output of the version information:

-----------------------------------
/opt/gcc-4.7/bin/g++ -v
Using built-in specs.
COLLECT_GCC=/opt/gcc-4.7/bin/g++
COLLECT_LTO_WRAPPER=/opt/gcc-4.7/libexec/gcc/x86_64-unknown-linux-gnu/4.7.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ./configure --prefix=/opt/gcc-4.7 --enable-languages=c,c++
--enable-threads=posix --enable-tls --enable-libgomp --enable-lto --disable-nls
--disable-checking --disable-multilib --disable-bootstrap
Thread model: posix
gcc version 4.7.0 20111105 (experimental) (GCC) 
------------------------------------

It's an ubuntu system (11.10 64Bit). I compiled the gcc from the then newest
snapshot.

[Bug c++/51139] c++11 alias-declarations doasn't work contrary to relase notes

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51139

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-11-15 11:32:21 UTC ---
it was only implemented on the 7th, your compiler is too old

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45114#c13

[Bug c++/51139] c++11 alias-declarations doasn't work contrary to relase notes

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51139

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|critical                    |normal

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-11-15 11:33:52 UTC ---
and severity is never "critical" for a brand new feature (in the C++11 mode
still labelled experimental) in an unreleased compiler

[Bug c++/51139] c++11 alias-declarations doasn't work contrary to relase notes

[sp at comsulting dot de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51139

--- Comment #3 from Sven Passig <sp at comsulting dot de> 2011-11-15 11:36:53 UTC ---
(In reply to comment #2)
> and severity is never "critical" for a brand new feature (in the C++11 mode
> still labelled experimental) in an unreleased compiler

ah ok, thanks for clarifying

[Bug c++/51139] c++11 alias-declarations doasn't work contrary to relase notes

[sp at comsulting dot de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51139

--- Comment #4 from Sven Passig <sp at comsulting dot de> 2011-11-15 11:42:45 UTC ---
(In reply to comment #1)
> it was only implemented on the 7th, your compiler is too old
> 
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45114#c13

Thanks for this ultrafast answer on this.

I tried to figure out this by myself but my svn client is still downloading the
subversion log for commit commends (there seams to be no online source of the
commit log).

[Bug c++/51139] c++11 alias-declarations doasn't work contrary to relase notes

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51139

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-11-15 12:40:22 UTC ---
All commits are sent to http://gcc.gnu.org/ml/gcc-cvs/

Or you can look at http://gcc.gnu.org/viewcvs/ at the ChangeLog files.

e.g. for the C++ front end:
http://gcc.gnu.org/viewcvs/trunk/gcc/cp/ChangeLog
(although sometimes fetching that page times out because there are a LOT of
revisions to that file)

[Bug c++/51139] c++11 alias-declarations doasn't work contrary to relase notes

[sp at comsulting dot de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51139

--- Comment #6 from Sven Passig <sp at comsulting dot de> 2011-11-15 12:44:45 UTC ---
(In reply to comment #5)
> http://gcc.gnu.org/viewcvs/trunk/gcc/cp/ChangeLog
> (although sometimes fetching that page times out because there are a LOT of
> revisions to that file)

thanks a lot again, this is a great ressource. It was very easy to find the
"alias-declaration" entry and the further changes on this feature.