xref: /freebsd/usr.bin/mkdep/mkdep.1 (revision 0d66206fff44f864ea8a4b220c3a53b4caa959a0)
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28.\"     @(#)mkdep.1	8.1 (Berkeley) 6/6/93
29.\" $FreeBSD$
30.\"
31.Dd October 23, 2015
32.Dt MKDEP 1
33.Os
34.Sh NAME
35.Nm mkdep
36.Nd construct Makefile dependency list
37.Sh SYNOPSIS
38.Nm
39.Op Fl ap
40.Op Fl f Ar file
41.Op Ar flags
42.Ar
43.Sh DESCRIPTION
44The
45.Nm
46utility takes a set of flags for the C compiler and a list
47of C source files as arguments and constructs a set of include
48file dependencies which are written into the file ``.depend''.
49An example of its use in a Makefile might be:
50.Bd -literal -offset indent
51CFLAGS= -O -I../include
52SRCS= file1.c file2.c
53
54depend:
55	mkdep ${CFLAGS} ${SRCS}
56.Ed
57.Pp
58where the macro SRCS is the list of C source files and the macro
59CFLAGS is the list of flags for the C compiler.
60.Pp
61The user has the ability to change the preprocessor and preprocessor options
62used.
63For instance, to use
64.Sy cc
65as the preprocessor and to ignore system
66headers, one would use
67.Bd -literal -offset indent
68depend:
69	env MKDEP_CPP="cc -E" MKDEP_CPP_OPTS=-MM mkdep \\
70		${CFLAGS} ${SRCS}
71.Ed
72.Pp
73The options are as follows:
74.Bl -tag -width Ds
75.It Fl a
76Append to the output file,
77so that multiple
78.Nm Ns 's
79may be run from a single Makefile.
80.It Fl f
81Write the include file dependencies to
82.Ar file ,
83instead of the default ``.depend''.
84.It Fl p
85Cause
86.Nm
87to produce dependencies of the form:
88.Bd -literal -offset indent
89program: program.c
90.Ed
91.Pp
92so that subsequent makes will produce
93.Ar program
94directly from its C module rather than using an intermediate
95.Pa \&.o
96module.
97This is useful for programs whose source is contained in a single
98module.
99.El
100.Sh ENVIRONMENT
101.Bl -tag -width MKDEP_CPP_OPTS
102.It Ev CC
103Specifies the C compiler to use.
104The specified compiler is expected to have
105options consistent with the GNU C compiler.
106The default is
107.Sy cc .
108.It Ev MKDEP_CPP
109Specifies the preprocessor to use.
110The default is "${CC} -E".
111.It Ev MKDEP_CPP_OPTS
112Specifies the non-CFLAGS options for the preprocessor.
113The default is
114"-M".
115.El
116.Sh FILES
117.Bl -tag -width .depend -compact
118.It Pa .depend
119File containing list of dependencies.
120.El
121.Sh SEE ALSO
122.Xr cc 1 ,
123.Xr cpp 1 ,
124.Xr make 1
125.Sh HISTORY
126The
127.Nm
128command appeared in
129.Bx 4.3 Tahoe .
130