[Bug target/60443] New: Target specific options that change the ABI should be marked

["rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60443

            Bug ID: 60443
           Summary: Target specific options that change the ABI should be
                    marked
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Keywords: lto
          Severity: enhancement
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
                CC: hubicka at gcc dot gnu.org

Currently there is no way to handle ABI-changing target options conservatively
in lto-wrapper (complain if there are mismatches inbetween files, make sure
to carry them over to link-time).  This is because explicitely handling them
is not possible (the OPT_ enum is different for each target).

ABI changing options should be marked in the .opt files with a flag that
can be checked instead.