[Bug target/71390] New: PowerPC GCC should warn if use does -mcpu=, and an old assembler was used

[meissner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71390

            Bug ID: 71390
           Summary: PowerPC GCC should warn if use does -mcpu=<foo>, and
                    an old assembler was used
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: meissner at gcc dot gnu.org
  Target Milestone: ---

When you configure a PowerPC compiler with an old assembler, it configures the
compiler so it does not generate the new instructions.  In these cases, the
compiler should issue a warning if you use a -mcpu=<xxx> and the assembler does
not support <xxx>.