130 lines
3.7 KiB
Groff
130 lines
3.7 KiB
Groff
.\" Copyright (c) 1987, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)mkdep.1 8.1 (Berkeley) 6/6/93
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.\" $FreeBSD$
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.\"
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.Dd October 23, 2015
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.Dt MKDEP 1
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.Os
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.Sh NAME
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.Nm mkdep
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.Nd construct Makefile dependency list
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.Sh SYNOPSIS
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.Nm
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.Op Fl ap
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.Op Fl f Ar file
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.Op Ar flags
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.Ar
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.Sh DESCRIPTION
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The
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.Nm
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utility takes a set of flags for the C compiler and a list
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of C source files as arguments and constructs a set of include
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file dependencies which are written into the file ``.depend''.
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An example of its use in a Makefile might be:
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.Bd -literal -offset indent
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CFLAGS= -O -I../include
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SRCS= file1.c file2.c
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depend:
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mkdep ${CFLAGS} ${SRCS}
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.Ed
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.Pp
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where the macro SRCS is the list of C source files and the macro
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CFLAGS is the list of flags for the C compiler.
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.Pp
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The user has the ability to change the preprocessor and preprocessor options
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used.
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For instance, to use
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.Sy cc
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as the preprocessor and to ignore system
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headers, one would use
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.Bd -literal -offset indent
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depend:
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env MKDEP_CPP="cc -E" MKDEP_CPP_OPTS=-MM mkdep \\
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${CFLAGS} ${SRCS}
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.Ed
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.Pp
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The options are as follows:
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.Bl -tag -width Ds
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.It Fl a
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Append to the output file,
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so that multiple
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.Nm Ns 's
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may be run from a single Makefile.
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.It Fl f
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Write the include file dependencies to
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.Ar file ,
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instead of the default ``.depend''.
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.It Fl p
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Cause
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.Nm
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to produce dependencies of the form:
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.Bd -literal -offset indent
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program: program.c
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.Ed
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.Pp
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so that subsequent makes will produce
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.Ar program
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directly from its C module rather than using an intermediate
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.Pa \&.o
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module.
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This is useful for programs whose source is contained in a single
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module.
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.El
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.Sh ENVIRONMENT
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.Bl -tag -width MKDEP_CPP_OPTS
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.It Ev CC
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Specifies the C compiler to use.
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The specified compiler is expected to have
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options consistent with the GNU C compiler.
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The default is
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.Sy cc .
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.It Ev MKDEP_CPP
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Specifies the preprocessor to use.
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The default is "${CC} -E".
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.It Ev MKDEP_CPP_OPTS
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Specifies the non-CFLAGS options for the preprocessor.
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The default is
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"-M".
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.El
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.Sh FILES
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.Bl -tag -width .depend -compact
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.It Pa .depend
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File containing list of dependencies.
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.El
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.Sh SEE ALSO
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.Xr cc 1 ,
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.Xr cpp 1 ,
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.Xr make 1
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Bx 4.3 Tahoe .
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