preprocessor/3669: -M -g3 outputs macros as well as dependency info

[derrick@caltech.edu]

>Number:         3669
>Category:       preprocessor
>Synopsis:       -M -g3 outputs macros as well as dependency info
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jul 13 02:06:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     
>Release:        3.0
>Organization:
Caltech
>Environment:
System: Linux roadrunner.tapir.caltech.edu 2.2.14-5.0 #1 Tue Mar 7 21:07:39 EST 2000 i686 unknown
Architecture: i686

	
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ../gcc-3.0/configure --prefix=/ufs/newman/users/derrick/gnu/gcc-3.0
>Description:
	If the -g3 option is present when generating dependency information
	with -M, macro definitions are spuriously output as well.
>How-To-Repeat:
Try
#define debug
#include <iostream>
void f() { }
Then 'g++ -M -g2 preprocbug.cc' works correctly but
'g++ -M -g3 preprocbug.cc' produces additional unwanted output.
>Fix:
	Don't use -g3 when producing only dependency information.
>Release-Note:
>Audit-Trail:
>Unformatted: