[Bug c++/65750] [4.9/5 Regression] misinterpret in a virtual member function with a C++11 style function signature

["redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65750

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |rejects-valid
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-04-13
      Known to work|                            |4.8.3
            Summary|miss interpret in a virtual |[4.9/5 Regression]
                   |member function with a      |misinterpret in a virtual
                   |C++11 style function        |member function with a
                   |signature                   |C++11 style function
                   |                            |signature
     Ever confirmed|0                           |1

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Rejects-valid, introduced by support for C++14 return type deduction.


Reduced:

template<typename T> struct F { };

class a
{
  virtual auto f( F< void () > ) -> void;
  virtual auto g( F< auto () -> void > ) -> void;
};

auto main() -> int { }



The error in comment 0 is only on the 4.9 branch, 5.0 gives a different error:

s.cc:6:22: error: use of ‘auto’ in parameter declaration only available with
-std=c++14 or -std=gnu++14
   virtual auto g( F< auto () -> void > ) -> void;
                      ^
s.cc:6:22: error: use of ‘auto’ in parameter declaration only available with
-std=c++14 or -std=gnu++14
s.cc:6:38: error: template argument 1 is invalid
   virtual auto g( F< auto () -> void > ) -> void;
                                      ^
s.cc:6:22: error: use of ‘auto’ in parameter declaration only available with
-std=c++14 or -std=gnu++14
   virtual auto g( F< auto () -> void > ) -> void;
                      ^
s.cc:6:22: error: use of ‘auto’ in parameter declaration only available with
-std=c++14 or -std=gnu++14
s.cc:6:38: error: template argument 1 is invalid
   virtual auto g( F< auto () -> void > ) -> void;
                                      ^
s.cc:6:22: error: use of ‘auto’ in parameter declaration only available with
-std=c++14 or -std=gnu++14
   virtual auto g( F< auto () -> void > ) -> void;
                      ^
s.cc:6:22: error: use of ‘auto’ in parameter declaration only available with
-std=c++14 or -std=gnu++14
s.cc:6:38: error: template argument 1 is invalid
   virtual auto g( F< auto () -> void > ) -> void;
                                      ^
s.cc:6:22: error: use of ‘auto’ in parameter declaration only available with
-std=c++14 or -std=gnu++14
   virtual auto g( F< auto () -> void > ) -> void;
                      ^
s.cc:6:22: error: use of ‘auto’ in parameter declaration only available with
-std=c++14 or -std=gnu++14
s.cc:6:38: error: template argument 1 is invalid
   virtual auto g( F< auto () -> void > ) -> void;
                                      ^
s.cc:6:22: error: use of ‘auto’ in parameter declaration only available with
-std=c++14 or -std=gnu++14
   virtual auto g( F< auto () -> void > ) -> void;
                      ^
s.cc:6:22: error: use of ‘auto’ in parameter declaration only available with
-std=c++14 or -std=gnu++14
s.cc:6:38: error: template argument 1 is invalid
   virtual auto g( F< auto () -> void > ) -> void;
                                      ^
s.cc:6:19: error: ‘F’ is not a type
   virtual auto g( F< auto () -> void > ) -> void;
                   ^
s.cc:6:20: error: expected ‘,’ or ‘...’ before ‘<’ token
   virtual auto g( F< auto () -> void > ) -> void;
                    ^
>From gcc-bugs-return-483471-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 13 09:44:04 2015
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From: "prathamesh3492 at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/49551] tentative declaration after definition and -fdata-sections cause ICE in C front-end.
Date: Mon, 13 Apr 2015 09:44:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idI551

prathamesh3492 at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|2015-03-23 00:00:00         |2015-04-13
                 CC|                            |charles.baylis at linaro dot org,
                   |                            |mkuvyrkov at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #4 from prathamesh3492 at gcc dot gnu.org ---
Hi,
The ICE is not reproducible on the trunk any more. git bisect shows
it became non-reproducible after r221297.

Thank you,
Prathamesh