[Bug c/119311] musttail attribute is lost sometimes as single statement for then part of an if statement

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119311

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
            Summary|musttail attribute          |musttail attribute is lost
                   |ineffective at -O0 and -O1  |sometimes as single
                   |                            |statement for then part of
                   |                            |an if statement
   Last reconfirmed|                            |2025-03-16

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Looks like the C front-end loses the musttail call attribute.

Workaround is to do:
  if (a > b) {
    [[gnu::musttail]] return gcd (a , b);
  }
  else {
    [[gnu::musttail]]return gcd (a, b);
  }