preprocessor/3951: need for -MF w/ -M breaks backward compat. w/ documented features.

[neil@gcc.gnu.org]

Synopsis: need for -MF w/ -M breaks backward compat. w/ documented features.

Responsible-Changed-From-To: unassigned->neil
Responsible-Changed-By: neil
Responsible-Changed-When: Tue Feb 19 00:58:37 2002
Responsible-Changed-Why:
    I'm the mug who is going to try and fix this.
    
    I just fixed a change in meaning from 2.95 of -o with -MD -E; it used to indicate the preprocessed output file, but 3.0 and CVS were taking it to indicate the object file.
    
    With a few more refinements, I think we can bang this on the head too.  There is plenty of time for 3.1; and I hope we can get it in 3.0.5 too if that exists.  Stay tuned 8^)
State-Changed-From-To: open->analyzed
State-Changed-By: neil
State-Changed-When: Tue Feb 19 00:58:37 2002
State-Changed-Why:
    Confirmed.  Woo... what fun.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=3951