omitting -W, -Wall etc in configure

[John W. Eaton]

On  9-Mar-2009, Jaroslav Hajek wrote:

| currently, Octave's configure script automatically adds -Wall, -W and
| -Wextra to the C++ flags. This works fine with gcc; however, with
| Intel C++ it's not so nice:
| -W and -Wextra are not supported, but ignored, so the configure
| scripts detects them as "accepted" and adds them, which makes icpc
| output a warning about ignored options after each source.
| -Wall is even worse as it makes the Intel compiler dump out an
| incredible number of warnings and remarks like "floating-point
| equality comparisons are unreliable" or "operands evaluated in
| unspecified order", which makes it impossible to inspect the progress
| of the build process visually, because the screen is flooded.
| I do not see, however, any built-in way to disable these flags in the
| configure scrip (this is a purely production build, so I don't need
| them at all).
| Have I overlooked something? Perhaps we could add an option for that?

I checked in the following change.  Does it do what you want?

  http://hg.savannah.gnu.org/hgweb/octave/rev/35e18344fae8

jwe