[Bug c++/52094] New: g++ yields different behaviour for postfix increment and decrement operators with fundamental types vs. classes

[Bug c++/52094] New: g++ yields different behaviour for postfix increment and decrement operators with fundamental types vs. classes

[dicomj23 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52094

             Bug #: 52094
           Summary: g++ yields different behaviour for postfix increment
                    and decrement operators with fundamental types vs.
                    classes
    Classification: Unclassified
           Product: gcc
           Version: 4.6.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: dicomj23@gmail.com

[Bug c++/52094] internal compiler error: Segmentation fault (program cc1plus)

[dicomj23 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52094

Dico <dicomj23 at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|g++ yields different        |internal compiler error:
                   |behaviour for postfix       |Segmentation fault (program
                   |increment and decrement     |cc1plus)
                   |operators with fundamental  |
                   |types vs. classes           |

--- Comment #1 from Dico <dicomj23 at gmail dot com> 2012-02-02 10:04:30 UTC ---
user:$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/i686-linux-gnu/4.6.1/lto-wrapper
Target: i686-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro
4.6.1-9ubuntu3' --with-bugurl=file:///usr/share/doc/gcc-4.6/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++,go --prefix=/usr
--program-suffix=-4.6 --enable-shared --enable-linker-build-id
--with-system-zlib --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.6
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-plugin
--enable-objc-gc --enable-targets=all --disable-werror --with-arch-32=i686
--with-tune=generic --enable-checking=release --build=i686-linux-gnu
--host=i686-linux-gnu --target=i686-linux-gnu
Thread model: posix
gcc version 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3) 
user:$ 



user$ gcc main.cpp & cat main.cpp
[1] 31057
namespace N { struct A { struct Inner; }; struct Inner {}; }
namespace NN { struct AA : N::A {}; struct AA::Inner : N::Inner {}; }

int main() { return 0; }
user$ gcc: internal compiler error: Segmentation fault (program cc1plus)
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.6/README.Bugs> for instructions.

[Bug c++/52094] ICE on definition of nested class in wrong namespace scope with wrong nested-name-qualifier

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52094

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-on-invalid-code
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-02-02
            Summary|internal compiler error:    |ICE on definition of nested
                   |Segmentation fault (program |class in wrong namespace
                   |cc1plus)                    |scope with wrong
                   |                            |nested-name-qualifier
     Ever Confirmed|0                           |1
      Known to fail|                            |4.4.3, 4.5.2, 4.6.2, 4.7.0

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-02-02 10:23:24 UTC ---
Reduced:

namespace N { struct A { struct Inner; }; }
namespace NN { struct AA : N::A {}; struct AA::Inner {}; }

[Bug c++/52094] ICE on definition of nested class in wrong namespace scope with wrong nested-name-qualifier

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52094

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-02-02 10:25:54 UTC ---
If the nested class is declared in an enclosing namespace scope (as required)
but still with the nested-name-qualifier of the derived type, G++ accepts it:

namespace N { struct A { struct Inner; }; }
namespace NN { struct AA : N::A {}; }
struct NN::AA::Inner {}; 

Clang++ and Comeau both reject this.

[Bug c++/52094] ICE on definition of nested class in wrong namespace scope with wrong nested-name-qualifier

[dicomj23 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52094

--- Comment #4 from Dico <dicomj23 at gmail dot com> 2012-02-02 10:34:41 UTC ---
I agree, but they don't perform a segmentation fault

[Bug c++/52094] ICE on definition of nested class in wrong namespace scope with wrong nested-name-qualifier

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52094

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-02-02 10:43:33 UTC ---
Why do you think I confirmed the bug and changed its status to NEW?

[Bug c++/52094] ICE on definition of nested class in wrong namespace scope with wrong nested-name-qualifier

[arnaut.billings at yahoo dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52094

arnaut.billings at yahoo dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |arnaut.billings at yahoo dot com

--- Comment #6 from arnaut.billings at yahoo dot com ---
Cygwin gcc (GCC) 4.7.3

Nested class in wrong class with typedef name qualifier also causes a
segmentation fault:

struct Foo
{
  struct Impl;
};

struct Bar
{
  typedef Foo base_type;

  struct base_type::Impl
  {
  };

};

Note: if "struct base_type::Impl" is changed to "struct Foo::Impl" then it will
produce an error message.

[Bug c++/52094] ICE on definition of nested class in wrong namespace scope with wrong nested-name-qualifier

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52094

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mpolacek at gcc dot gnu.org

--- Comment #8 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Comment 2 testcase fixed with r11-175.

[Bug c++/52094] ICE on definition of nested class in wrong namespace scope with wrong nested-name-qualifier

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52094

--- Comment #9 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Marek Polacek from comment #8)
> Comment 2 testcase fixed with r11-175.

And the accepts invalid is recorded as PR 58661.