c/7652: -Wswitch-break : Warn if a switch case falls through

[bangerth@dealii.org]

Synopsis: -Wswitch-break : Warn if a switch case falls through

State-Changed-From-To: open->analyzed
State-Changed-By: bangerth
State-Changed-When: Wed Nov 27 07:21:03 2002
State-Changed-Why:
    I doubt warning if a switch case falls through is a useful
    feature since it is so commonly used in a reasonable way.
    Note that if you write 
      case 1: case 2:
    you are actually using this, since the "case 1" simply falls
    through to the "case 2"...
    
    But I leave it to others to judge whether this would be
    useful.
    W.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7652