[Bug other/114191] New: Flags "Warning" and "Target" don't mix well in target.opt files

[gjl at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114191

            Bug ID: 114191
           Summary: Flags "Warning" and "Target" don't mix well in
                    target.opt files
           Product: gcc
           Version: 13.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: other
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gjl at gcc dot gnu.org
  Target Milestone: ---

In an .opt file, a backend can define target-specific diagnostic options, for
example gcc/config/avr/avr.opt has:

Wmisspelled-isr
Warning C C++ Var(avr_warn_misspelled_isr) Init(1)
Warn if the ISR is misspelled, ...

This is a "Target" option however (so it should be listed with --help=target,
which it currently is not). However, specifying the "Target" flag in avr.opt
makes the option no more recognizable:

$ avr-gcc main.c -c -Wall -Wmisspelled-isr
cc1: error: unrecognized command-line option '-Wmisspelled-isr'

I can reproduce this for target avr, but it likely affects all other targets as
well.

Set the component to "other". As it appears, there is no bugzilla component for
such internal problems.