md(1) BSD General Commands Manual md(1)
NAME
md -- process raw dependency files produced by cpp -MD
SYNOPSIS
md [-d] [-f] [-m makefile] [-u makefile] [-o outputfile] [-v] [-x]
[-D c|d|m|o|t|D]
DESCRIPTION
The md command basically does two things:
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. md canonicalizes and flushes repeats from the depen-
dency list. It also sorts the file names and "fills" them to a 78 char-
acter line.
md also updates the makefile directly with the dependency information, so
the .d file can be thrown away (see d option). This is done to save
space. md assumes that dependency information in the makefile is sorted
by .o file name and it procedes to merge in (add/or replace [as appropri-
ate]) the new dependency lines that it has generated. For time effi-
ciency, md 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 [f] is given.
FLAG SUMMARY
-D c|D|d|m|o|t
Specify debugging option(s):
c show file contents
D show very low level debugging
d show new dependency crunching
m show generation of makefile
o show files being opened
t show time comparisons
-d Delete the .d file after it is processed
-f Force an update of the dependencies in the makefile, even if the
makefile is more recent than the .n file. (This implies that md
has been run already.)
-m makefile
Specify the makefile to be upgraded. The defaults are makefile
and then Makefile.
-o outputfile
Specify an output file (other than a makefile) for the dependen-
cies.
-u makefile
Like -m, but the file will be created if necessary.
-v Set the verbose flag.
-x Expunge old dependency information from the makefile.
SEE ALSO
make(1)
BUGS
Old, possibly not used by anyone.
HISTORY
The md utility was written by Robert V. Baron at Carnegie-Mellon Univer-
sity.
BSD August 11, 2011 BSD
Mac OS X 10.7 - Generated Thu Aug 11 13:35:49 CDT 2011