[Bug c++/66517] New: [5 Regression] [C++11] sorry, unimplemented: unexpected AST of kind type_decl

[Bug c++/66517] New: [5 Regression] [C++11] sorry, unimplemented: unexpected AST of kind type_decl

[megahallon at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66517

            Bug ID: 66517
           Summary: [5 Regression] [C++11] sorry, unimplemented:
                    unexpected AST of kind type_decl
           Product: gcc
           Version: 5.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: megahallon at gmail dot com
  Target Milestone: ---

The following snippet:

-------------------------------------
template <typename S>
void p()
{
  int val = ({union {int x;}; 3;}
  );
}
-------------------------------------

built with g++ 5.1.0:

g++ -std=c++11 bug.cpp -c

gives the following error:

bug.cpp: In function ‘void p()’:
bug.cpp:5:3: sorry, unimplemented: unexpected AST of kind type_decl
   );
   ^

Same error with -std=c++14 but works with -std=c++98.
Also works with g++ 4.8.2.

Output from g++ -v:

Using built-in specs.
COLLECT_GCC=/usr/local/bin/g++
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-unknown-linux-gnu/5.1.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ./configure --prefix=/usr/local --enable-languages=c,c++
--disable-multilib
Thread model: posix
gcc version 5.1.0 (GCC)
>From gcc-bugs-return-488816-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jun 11 18:30:22 2015
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Subject: [Bug rtl-optimization/56766] Fails to combine (vec_select (vec_concat ...)) to (vec_merge ...)
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56766

--- Comment #19 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Segher Boessenkool from comment #18)
> (in reply to c#9)
> 
> Yes, this is a generic problem.  recog will not recognise patterns
> where regs are swapped in some places but not others.  This can of
> course be worked around in combine, but that will be expensive (and
> not solve the real problem).

So, do you think the patch in Comment #15 is the way to go at this time?
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Subject: [Bug rtl-optimization/56766] Fails to combine (vec_select (vec_concat ...)) to (vec_merge ...)
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idV766

--- Comment #20 from Segher Boessenkool <segher at gcc dot gnu.org> ---
That patch is similar to what all other backends do for similar
situations, yes.  There is no nicer way to do things as far as I
know.

[Bug c++/66517] [5 Regression] [C++11] sorry, unimplemented: unexpected AST of kind type_decl

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66517

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
probably a dup of PR66445

[Bug c++/66517] [5 Regression] [C++11] sorry, unimplemented: unexpected AST of kind type_decl

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66517

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |jason at gcc dot gnu.org
         Resolution|---                         |DUPLICATE

--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
Yes, duplicate.

*** This bug has been marked as a duplicate of bug 66445 ***