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md(1) [opendarwin man page]

md(1)							    BSD General Commands Manual 						     md(1)

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

Check Out this Related Man Page

gccmakedep(1)						      General Commands Manual						     gccmakedep(1)

gccmakedep - create dependencies in makefiles using 'gcc -M' SYNOPSIS
gccmakedep [ -sseparator ] [ -fmakefile ] [ -a ] [ -- options -- ] sourcefile ... DESCRIPTION
The gccmakedep program calls 'gcc -M' to output makefile rules describing the dependencies of each sourcefile, so that make(1) knows which object files must be recompiled when a dependency has changed. By default, gccmakedep places its output in the file named makefile if it exists, otherwise Makefile. An alternate makefile may be speci- fied with the -f option. It first searches the makefile for a line beginning with # DO NOT DELETE or one provided with the -s option, as a delimiter for the dependency output. If it finds it, it will delete everything following this up to the end of the makefile and put the output after this line. If it doesn't find it, the program will append the string to the makefile and place the output after that. EXAMPLE
Normally, gccmakedep will be used in a makefile target so that typing 'make depend' will bring the dependencies up to date for the make- file. For example, SRCS = file1.c file2.c ... CFLAGS = -O -DHACK -I../foobar -xyz depend: gccmakedep -- $(CFLAGS) -- $(SRCS) OPTIONS
The program will ignore any option that it does not understand, so you may use the same arguments that you would for gcc(1), including -D and -U options to define and undefine symbols and -I to set the include path. -a Append the dependencies to the file instead of replacing existing dependencies. -fmakefile Filename. This allows you to specify an alternate makefile in which gccmakedep can place its output. Specifying "-" as the file name (that is, -f-) sends the output to standard output instead of modifying an existing file. -sstring Starting string delimiter. This option permits you to specify a different string for gccmakedep to look for in the makefile. The default is "# DO NOT DELETE". -- options -- If gccmakedep encounters a double hyphen (--) in the argument list, then any unrecognized arguments following it will be silently ignored. A second double hyphen terminates this special treatment. In this way, gccmakedep can be made to safely ignore esoteric compiler arguments that might normally be found in a CFLAGS make macro (see the EXAMPLE section above). -D, -I, and -U options appearing between the pair of double hyphens are still processed normally. SEE ALSO
gcc(1), make(1), makedepend(1). AUTHOR
The version of the gccmakedep included in this X.Org Foundation release was originally written by the XFree86 Project based on code sup- plied by Hongjiu Lu. Colin Watson wrote this manual page, originally for the Debian Project, based partly on the manual page for makedepend(1). X Version 11 gccmakedep 1.0.2 gccmakedep(1)
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