[Bug c++/119236] GCC incorrectly accepts alignof() operator applied to function type

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119236

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
With the C front-end we do error out with -pedantic-errors:
```
<source>: In function 'main':
<source>:3:12: error: ISO C does not permit '_Alignof' applied to a function
type [-Wpedantic]
    3 |  alignof ( void ( void ) ) ;
      |            ^~~~

```

Likewise with the C++ front-end:
```
<source>: In function 'int main()':
<source>:3:2: error: ISO C++ does not permit 'alignof' applied to a function
type [-Wpedantic]
    3 |  alignof ( void ( void ) ) ;
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~
```

So you need -pedantic to get a diagnostic.