[Bug c++/114638] Hang and Memory Consumption Increase during Compilation with many object creation of itself

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114638

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2024-04-08
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
      Known to fail|                            |4.1.2

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
the problem seems related to tentative parsing. But I will note clang does give
an error quickly. 

Reduced C++98 testcase:
```
struct Z
{
  Z ();
  Z (Z const &);
};


Z t = Z ( Z ( Z ( Z ( Z ( Z ( Z ( Z ( Z ( Z ( Z ( Z ( Z ( Z ( Z ( Z ( Z ( Z ( Z
(Z (Z (Z ()));
```

GCC did get worse over time though. Add one more `Z(` and it fails. There is
definitely some O(n^2) issue going on. Most likely trying to figure out if this
is a function declaration vs a function call vs an object creation ...