1.\" Copyright (c) 1987, 1990, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 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