[Bug driver/37820] New: need command line option that prints all defaults and predefined macros

[Dave at Yost dot com]

For example, g++ --help says
  -std=<standard>          Assume that the input sources are for <standard>
but it doesn't say what the default is.


-- 
           Summary: need command line option that prints all defaults and
                    predefined macros
           Product: gcc
           Version: 4.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: driver
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: Dave at Yost dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37820