[Bug target/103421] New: -march=bogus12323123423452345 -march=skylake-avx512 is accepted as a command line option

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103421

            Bug ID: 103421
           Summary: -march=bogus12323123423452345 -march=skylake-avx512 is
                    accepted as a command line option
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---
            Target: x86_64

While looking into figuring out the best way of fixing an aarch64 issue I
decided to test what x86_64 does and lone and behold, x86_64 also allow bogus
values for -march too.

gcc -march=bogus12323123423452345 -march=skylake-avx512
gives no warning or error message.