NAME

     mkdep — construct Makefile dependency list

SYNOPSIS

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

DESCRIPTION

     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.

ENVIRONMENT

     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".

FILES

     .depend  File containing list of dependencies.

SEE ALSO

     cc(1), cpp(1), make(1)

HISTORY

     The mkdep command appeared in 4.3BSD-Tahoe.