[Bug c++/47068] New: [C++0x] internal compiler error on decltype(~ expression)

[Bug c++/47068] New: [C++0x] internal compiler error on decltype(~ expression)

[spillner at acm dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47068

           Summary: [C++0x] internal compiler error on decltype(~
                    expression)
           Product: gcc
           Version: 4.4.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: spillner@acm.org


The declaration

template <class T> struct broken {
  int member;
  typedef decltype(~ member) gcc_crashes_here;
};

generates the error message "internal compiler error: in lookup_member, at
cp/search.c:1200, Please submit a full bug report" when compiled with g++ 4.4.3
(with -std=c++0x, naturally.)

Similar code compiles without errors or warnings if any of the following
transformations are applied:
   - A literal expression (e.g. "~ 0L") is substituted for "~ member"
   - The operators !, &, -, +, or * (when member is changed to a pointer type)
are used instead of ~
   - The struct is not templated
   - The typedef is declared in a free function (even a templated free
function) rather than a class or struct
   - decltype is replaced by typeof and the code is compiled without -std=c++0x

Unfortunately I'm traveling at the moment and can't easily test on other gcc
versions.

[Bug c++/47068] [C++0x] internal compiler error on decltype(~ expression)

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47068

--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> 2010-12-27 16:26:04 UTC ---
I can reproduce it with current mainline.

[Bug c++/47068] [C++0x] internal compiler error on decltype(~ expression)

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47068

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2010.12.27 16:26:36
                 CC|                            |jason at gcc dot gnu.org
     Ever Confirmed|0                           |1

[Bug c++/47068] [C++0x] internal compiler error on decltype(~ expression)

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47068

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED

--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> 2010-12-28 15:34:44 UTC ---
Looking.

[Bug c++/47068] [C++0x] internal compiler error on decltype(~ expression)

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47068

--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> 2010-12-29 02:17:51 UTC ---
Author: jason
Date: Wed Dec 29 02:17:47 2010
New Revision: 168309

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=168309
Log:
    PR c++/47068
    * semantics.c (finish_id_expression): Don't note non-names
    as being used in the class.

Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/decltype24.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/semantics.c
    trunk/gcc/testsuite/ChangeLog

[Bug c++/47068] [C++0x] internal compiler error on decltype(~ expression)

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47068

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED

--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> 2011-01-01 00:15:01 UTC ---
Fixed.