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mkdep – construct Makefile dependency list

SYNOPSIS DESCRIPTION ENVIRONMENT FILES SEE ALSO HISTORY

mkdep [-ap] [-f file] [flags] file ...

The mkdep utility takes a set of flags for the C compiler and a list of C source files as arguments and constructs a set of include file dependencies which are written into the file ``.depend''. An example of its use in a Makefile might be:

CFLAGS= -O -I../include
SRCS= file1.c file2.c

depend:
        mkdep ${CFLAGS} ${SRCS}

where the macro SRCS is the list of C source files and the macro CFLAGS is the list of flags for the C compiler.

The user has the ability to change the preprocessor and preprocessor options used. For instance, to use cc as the preprocessor and to ignore system headers, one would use

depend:
        env MKDEP_CPP="cc -E" MKDEP_CPP_OPTS=-MM mkdep \
                ${CFLAGS} ${SRCS}

The options are as follows:

-a
	Append to the output file, so that multiple Ns may be run from a single Makefile.
-f
	Write the include file dependencies to file, instead of the default ``.depend''.
-p
	Cause mkdep to produce dependencies of the form: program: program.c so that subsequent makes will produce program directly from its C module rather than using an intermediate amp;.o module. This is useful for programs whose source is contained in a single module.

CC	Specifies the C compiler to use. The specified compiler is expected to have options consistent with the GNU C compiler. The default is cc.
MKDEP_CPP	Specifies the preprocessor to use. The default is "${CC} -E".
MKDEP_CPP_OPTS
	Specifies the non-CFLAGS options for the preprocessor. The default is "-M".

.depend
	File containing list of dependencies.

The mkdep command appeared in BSD 4.3 Tahoe .