01-22-2013
A problem I have is how to pass the option from the main makefile to the subdirectory makefile. I do not like using recursive make build systems (example a make in every directory). However, since I have put all the make files in one place together with a main Makefile, I do not see a problem.
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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 efficiency, 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 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 dependencies.
-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 University.
BSD
June 2, 2019 BSD