[Bug preprocessor/81515] C pre-processor allows invalid words

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81515

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

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

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is expected. Gcc has a warning for undefined identifiers used in #if.


In standard C preprocessor language undefined identifiers used in #if is
converted into the literal 0.  This has been part of the language since C90 (or
even before).