[Bug driver/26168] New: improve comment about adding command line options

["phr-gcc at nightsong dot com" <gcc-bugzilla at gcc dot gnu dot org>]

gcc/gcc.c has a comment at the top that's a guide to adding a command line
option.  It's incomplete: it should say to add the new option to c.opt and
rebuild the compiler, and then describe how the variable OPT_whatever gets
created by the awk scripts during the build process, so you can then check for
the option elsewhere in the compiler.  That mechanism doesn't appear documented
at all, and took me a while to figure out through code tracing.  Some
description in the comment would have been a big help.

Also, the comment at the top of the automatically-generated options.c file says
it's generated by "opts.sh" rather than by those awk scripts.  That's a minor
thing but updating it wouldn't hurt.


-- 
           Summary: improve comment about adding command line options
           Product: gcc
           Version: 4.0.1
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: driver
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: phr-gcc at nightsong dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26168