[Bug target/98667] gcc generates endbr32 invalid opcode on -march=i486

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98667

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2021-01-14
     Ever confirmed|0                           |1

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
It probably makes sense to disable CET by default when GCC is configured to
"less" than i686-linux (definitely for i386 and i486, not sure about i586).
Thus change the regexps in config/cet.m4 to not include those for =auto
at least.