[Bug c++/65845] typeid doesn't work consistently on pure virtual classes

[Bug c++/65845] typeid doesn't work consistently on pure virtual classes

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65845

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|major                       |normal

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The expression typeid(Interface()) is the type of a function that returns
Interface, but such a function cannot exist because the type is abstract.

I don't know why typeid(Vector<Interface>) needs to instantiate the default
argument.


The output from trunk is:

t.cc: In function ‘int main()’:
t.cc:20:20: error: ‘type name’ declared as function returning an abstract class
type
   typeid(Interface()).name(); //GCC 4.9.2 and VS2013: doesn't compile
                    ^
t.cc: In instantiation of ‘class Vector<Interface>’:
t.cc:38:1:   required from here
t.cc:11:8: error: cannot allocate an object of abstract type ‘Interface’
   void resize(unsigned n, T val = T()); //C++03 style resize
        ^
t.cc:3:7: note:   because the following virtual functions are pure within
‘Interface’:
 class Interface {
       ^
t.cc:5:15: note:        virtual int Interface::size() const
   virtual int size() const = 0;
               ^
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Subject: [Bug rtl-optimization/64916] ira.c update_equiv_regs patch causes gcc/testsuite/gcc.target/arm/pr43920-2.c regression
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idd916

--- Comment #8 from Jeffrey A. Law <law at redhat dot com> ---
Alex, you're right.  It's just an artifact which patch I pulled out of my todo
list.  Your patches are effectively doing the same thing.  If you'd like I can
add you to the ChangeLog entry for the fix.

[Bug c++/65845] typeid doesn't work consistently on pure virtual classes

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65845

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |11.0
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |FIXED
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=86252

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Fixed for GCC 11 by r11-5036 aka PR 86252