-Wall -Wswitch-default

[Jeff Schwab]

The g++ man page says -Wall is equivalent to "All of the above -W
options combined."  The -Wswitch-default option, however, does not
seem to be enabled by -Wall.  Has anybody else seen this, or do you
see anything I'm missing?

Here's a previous discussion I found on the net about this topic:
http://archive.netbsd.se/?ml=gcc&a=2007-03&t=3411291

If nobody has a better idea, I'll submit the bug report.  I think I
see the problem in gcc/c-opts.c, so I'll try to include a patch.