preprocessor/4176: #pragma warnings are "invisible"

[neil@gcc.gnu.org]

Synopsis: #pragma warnings are "invisible"

State-Changed-From-To: analyzed->closed
State-Changed-By: neil
State-Changed-When: Fri Sep 21 01:24:53 2001
State-Changed-Why:
    -Wunknown-pragmas was acceptable to submitter.
    
    There are a bunch of people who want the current behaviour,
    so we will leave it as it is.  Adding support
    for a new pragma would be a lesser eveil than changing
    behaviour of unknown ones IMO.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view&pr=4176&database=gcc