preprocessor/5899: -M disables -dM

[schwab@suse.de]

>Number:         5899
>Category:       preprocessor
>Synopsis:       -M disables -dM
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Mar 09 10:26:00 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     schwab@suse.de
>Release:        3.1 20020225 (experimental)
>Organization:
>Environment:

>Description:
Using -M together with -dM suppresses the output of the latter.  This
breaks building glibc.
>How-To-Repeat:
$ echo '#include <limits.h>' | gcc -E -xc - -dM -M -MF x.dep
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: