xref: /dragonfly/usr.bin/mkdep/mkdep.1 (revision 1975d09e) 
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28.\"     @(#)mkdep.1	8.1 (Berkeley) 6/6/93
29.\" $FreeBSD: src/usr.bin/mkdep/mkdep.1,v 1.7.2.7 2002/12/29 16:35:40 schweikh Exp $
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31.\"
32.Dd June 6, 1993
33.Dt MKDEP 1
34.Os
35.Sh NAME
36.Nm mkdep
37.Nd construct Makefile dependency list
38.Sh SYNOPSIS
39.Nm
40.Op Fl ap
41.Op Fl f Ar file
42.Op Ar flags
43.Ar
44.Sh DESCRIPTION
45The
46.Nm
47utility takes a set of flags for the C compiler and a list
48of C source files as arguments and constructs a set of include
49file dependencies which are written into the file ``.depend''.
50An example of its use in a Makefile might be:
51.Bd -literal -offset indent
52CFLAGS= -O -I../include
53SRCS= file1.c file2.c
54
55depend:
56	mkdep ${CFLAGS} ${SRCS}
57.Ed
58.Pp
59where the macro SRCS is the list of C source files and the macro
60CFLAGS is the list of flags for the C compiler.
61.Pp
62The user has the ability to change the preprocessor and preprocessor options
63used.  For instance, to use gcc as the preprocessor and to ignore system
64headers, one would use
65.Bd -literal -offset indent
66depend:
67	env MKDEP_CPP="gcc -E" MKDEP_CPP_OPTS=-MM mkdep \\
68		${CFLAGS} ${SRCS}
69.Ed
70.Pp
71The options are as follows:
72.Bl -tag -width Ds
73.It Fl a
74Append to the output file,
75so that multiple
76.Nm Ns 's
77may be run from a single Makefile.
78.It Fl f
79Write the include file dependencies to
80.Ar file ,
81instead of the default ``.depend''.
82.It Fl p
83Cause
84.Nm
85to produce dependencies of the form:
86.Bd -literal -offset indent
87program: program.c
88.Ed
89.Pp
90so that subsequent makes will produce
91.Ar program
92directly from its C module rather than using an intermediate
93.Pa \&.o
94module.
95This is useful for programs whose source is contained in a single
96module.
97.El
98.Sh ENVIRONMENT
99.Bl -tag -width MKDEP_CPP_OPTS
100.It Ev CC
101Specifies the C compiler to use.  The specified compiler is expected to have
102options consistent with the GNU C compiler.
103.It Ev MKDEP_CPP
104Specifies the preprocessor to use.  The default is "${CC} -E".
105.It Ev MKDEP_CPP_OPTS
106Specifies the non-CFLAGS options for the preprocessor.  The default is
107"-M".
108.El
109.Sh FILES
110.Bl -tag -width .depend -compact
111.It Pa .depend
112File containing list of dependencies.
113.El
114.Sh SEE ALSO
115.Xr cc 1 ,
116.Xr cpp 1 ,
117.Xr make 1
118.Sh HISTORY
119The
120.Nm
121command appeared in
122.Bx 4.3 Tahoe .
123