makefile

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 character 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
     appropriate]) the new dependency lines that it has generated.  For time effeciency, md assumes that any .d files it is given that were cre-
     ated before the creation date of the "makefile" were processed already.  It ignores them unless the force flag [f] is given.

FLAG SUMMARY

     -d delete the .d file after it is processed

     -f force an update of the dependencies in the makefile even though 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

     -u makefile like -m above, but the file will be created if necessary

     -o outputfile specify an output file for the dependencies other than a makefile

     -v set the verbose flag

     -x expunge old dependency info from makefile

     -D c|d|m|o|t|D subswitch for debugging.  can be followed by any of "c", "d", "m", "o", "t", "D" meaning:

	      c       show file contents
	      d       show new dependency crunching
	      m       show generation of makefile
	      o       show files being opened
	      t       show time comparisons
	      D       show very low level debugging

SEE ALSO

     make(1)

BUGS

     Old, possibly not used by anyone.

HISTORY

     The md utility was written by Robert V Baron at Carnegie-Mellon University.

BSD
								   June 2, 2019 							       BSD