[Bug c++/86182] [8/9 Regression] gcc crashes when compiling the code

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86182

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2
             Status|UNCONFIRMED                 |NEW
      Known to work|                            |7.3.1
            Version|unknown                     |8.1.1
           Keywords|                            |accepts-invalid,
                   |                            |ice-on-invalid-code
   Last reconfirmed|                            |2018-06-18
     Ever confirmed|0                           |1
            Summary|gcc crashes when compiling  |[8/9 Regression] gcc
                   |the code                    |crashes when compiling the
                   |                            |code
   Target Milestone|---                         |8.2

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  GCC 7 rejects it:

> g++-7 t.C -S
t.C: In instantiation of ‘const char* f(T*) [with T = main()::<unnamed
union>]’:
t.C:11:32:   required from here
t.C:5:4: error: use of local variable with automatic storage from containing
function
  u.x = "hello world";
  ~~^
t.C:4:4: note: ‘main()::<unnamed union> <anonymous>’ declared here
  T u(*t);
    ^
t.C:6:19: error: use of local variable with automatic storage from containing
function
  printf("%s\n", u.x);
                 ~~^
t.C:4:4: note: ‘main()::<unnamed union> <anonymous>’ declared here
  T u(*t);
    ^