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 cdmotD]

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 effe-
     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 SUMARY
     -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 cdmotD 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 Univer-
     sity.

BSD                              March 6, 2010                             BSD