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Dd "December 25, 2002"
Dt md 1
Os
Sh NAME
Nm md
Nd process raw dependency files produced by cpp -MD
Sh SYNOPSIS
Nm
Op Fl d
Op Fl f
Op Fl m Ar makefile
Op Fl u Ar makefile
Op Fl o Ar outputfile
Op Fl v
Op Fl x
Op Fl D Ar c|d|m|o|t|D
Sh DESCRIPTION
The
Nm
command basically does two things:
Pp
Process the raw dependency files produced by the cpp -MD option.
There is one line in the file for every #include encountered, but
there are repeats and patterns like .../dir1/../dir2 that appear which
should reduce to .../dir2.
Nm
canonicalizes and flushes repeats from the dependency list.
It also sorts the file names and "fills" them to a 78 character line.
Pp
Nm
also updates the makefile directly with the dependency information,
so the .d file can be thrown away (see
Ar d
option).  This is done to save space.
Nm
assumes that dependency information in the makefile is sorted by .o
file name and it procedes to merge in (add/or replace [as appropriate])
the new dependency lines that it has generated.
For time efficiency,
Nm
assumes that any .d files it is given that were created
before the creation date of the "makefile" were processed
already.  It ignores them unless the force flag
Op f
is given.
Pp
Sh FLAG SUMMARY
Bl -tag -width indent
It Fl D Ar c|D|d|m|o|t
Specify debugging option(s):
Bl -tag -width indent
It c
show file contents
It D
show very low level debugging
It d
show new dependency crunching
It m
show generation of makefile
It o
show files being opened
It t
show time comparisons
El
It Fl d
Delete the .d file after it is processed
It Fl f
Force an update of the dependencies in the makefile,
even if the makefile is more recent than the .n file.
(This implies that
Nm
has been run already.)
It Fl m Ar makefile
Specify the makefile to be upgraded.  The defaults are
Ar makefile
and then
Ar Makefile .
It Fl o Ar outputfile
Specify an output file (other than a makefile) for the dependencies.
It Fl u Ar makefile
Like
Fl m ,
but the file will be created if necessary.
It Fl v
Set the verbose flag.
It Fl x
Expunge old dependency information from the makefile.
El
Sh SEE ALSO
Xr make 1
Sh BUGS
Old, possibly not used by anyone.
Sh HISTORY
The
Nm
utility was written by Robert V. Baron at Carnegie-Mellon University.

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