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