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FreeBSD 11.0 - man page for mkdep (freebsd section 1)

MKDEP(1)						    BSD General Commands Manual 						  MKDEP(1)

mkdep -- construct Makefile dependency list
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 gcc as the preprocessor and to ignore system headers, one would use depend: env MKDEP_CPP="gcc -E" MKDEP_CPP_OPTS=-MM mkdep \ ${CFLAGS} ${SRCS} The options are as follows: -a Append to the output file, so that multiple mkdep's may be run from a single Makefile. -f Write the include file dependencies to file, instead of the default ``.depend''. -p Cause mkdep to produce dependencies of the form: program: program.c so that subsequent makes will produce program directly from its C module rather than using an intermediate .o module. This is useful for programs whose source is contained in a single module.
CC Specifies the C compiler to use. The specified compiler is expected to have options consistent with the GNU C compiler. MKDEP_CPP Specifies the preprocessor to use. The default is "${CC} -E". MKDEP_CPP_OPTS Specifies the non-CFLAGS options for the preprocessor. The default is "-M".
.depend File containing list of dependencies.
cc(1), cpp(1), make(1)
The mkdep command appeared in 4.3BSD-Tahoe.
June 6, 1993 BSD