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MAKE(1)                       LOCAL USER COMMANDS                      MAKE(1)



NAME
       make - GNU make utility to maintain groups of programs

SYNOPSIS
       make [ -f makefile ] [ options ] ... [ targets ] ...

WARNING
       This  man  page is an extract of the documentation of GNU make.  It is updated only
       occasionally, because the GNU project does not use nroff.   For  complete,  current
       documentation,  refer  to  the  Info  file make.info which is made from the Texinfo
       source file make.texi.

DESCRIPTION
       The purpose of the make utility is to determine automatically  which  pieces  of  a
       large program need to be recompiled, and issue the commands to recompile them.  The
       manual describes the GNU implementation of  make,  which  was  written  by  Richard
       Stallman  and Roland McGrath, and is currently maintained by Paul Smith.  Our exam-
       ples show C programs, since they are most common, but you can  use  make  with  any
       programming language whose compiler can be run with a shell command.  In fact, make
       is not limited to programs.  You can use it to describe any task where  some  files
       must be updated automatically from others whenever the others change.

       To  prepare  to  use make, you must write a file called the makefile that describes
       the relationships among files in your program, and  the  states  the  commands  for
       updating  each  file.   In a program, typically the executable file is updated from
       object files, which are in turn made by compiling source files.

       Once a suitable makefile exists, each time you change some source files, this  sim-
       ple shell command:

              make

       suffices  to perform all necessary recompilations.  The make program uses the make-
       file data base and the last-modification times of the files to decide which of  the
       files need to be updated.  For each of those files, it issues the commands recorded
       in the data base.

       make executes commands in the makefile to update one or more  target  names,  where
       name  is  typically  a program.  If no -f option is present, make will look for the
       makefiles GNUmakefile, makefile, and Makefile, in that order.

       Normally you should call your makefile either makefile or Makefile.  (We  recommend
       Makefile  because it appears prominently near the beginning of a directory listing,
       right near other important files such as README.)  The first name checked, GNUmake-
       file,  is not recommended for most makefiles.  You should use this name if you have
       a makefile that is specific to GNU make, and will not be understood by  other  ver-
       sions of make.  If makefile is '-', the standard input is read.

       make  updates  a target if it depends on prerequisite files that have been modified
       since the target was last modified, or if the target does not exist.

OPTIONS
       -b, -m
            These options are ignored for compatibility with other versions of make.

       -B, --always-make
            Unconditionally make all targets.

       -C dir, --directory=dir
            Change to directory dir before reading the makefiles or doing  anything  else.
            If multiple -C options are specified, each is interpreted relative to the pre-
            vious one: -C / -C etc is equivalent to -C /etc.  This is typically used  with
            recursive invocations of make.

       -d   Print  debugging  information in addition to normal processing.  The debugging
            information says which files are being considered for  remaking,  which  file-
            times  are  being compared and with what results, which files actually need to
            be remade, which implicit rules are considered and which are  applied---every-
            thing interesting about how make decides what to do.

       --debug[=FLAGS]
            Print  debugging  information  in addition to normal processing.  If the FLAGS
            are omitted, then the behavior is the same as if -d was specified.  FLAGS  may
            be a for all debugging output (same as using -d), b for basic debugging, v for
            more verbose basic debugging, i for showing implicit rules, j for  details  on
            invocation of commands, and m for debugging while remaking makefiles.

       -e, --environment-overrides
            Give variables taken from the environment precedence over variables from make-
            files.

       +-f file, --file=file, --makefile=FILE
            Use file as a makefile.

       -i, --ignore-errors
            Ignore all errors in commands executed to remake files.

       -I dir, --include-dir=dir
            Specifies a directory dir to search for included  makefiles.   If  several  -I
            options  are used to specify several directories, the directories are searched
            in the order specified.  Unlike the arguments to other flags of make, directo-
            ries  given  with -I flags may come directly after the flag: -Idir is allowed,
            as well as -I dir.  This syntax is allowed for compatibility with the  C  pre-
            processor's -I flag.

       -j [jobs], --jobs[=jobs]
            Specifies  the  number  of jobs (commands) to run simultaneously.  If there is
            more than one -j option, the last one is effective.  If the -j option is given
            without  an  argument,  make  will  not  limit the number of jobs that can run
            simultaneously.

       -k, --keep-going
            Continue as much as possible after an error.  While the  target  that  failed,
            and those that depend on it, cannot be remade, the other dependencies of these
            targets can be processed all the same.

       -l [load], --load-average[=load]
            Specifies that no new jobs (commands) should be started if  there  are  others
            jobs  running and the load average is at least load (a floating-point number).
            With no argument, removes a previous load limit.

       -L, --check-symlink-times
            Use the latest mtime between symlinks and target.

       -n, --just-print, --dry-run, --recon
            Print the commands that would be executed, but do not execute them.

       -o file, --old-file=file, --assume-old=file
            Do not remake the file file even if it is older than its dependencies, and  do
            not  remake  anything  on account of changes in file.  Essentially the file is
            treated as very old and its rules are ignored.

       -p, --print-data-base
            Print the data base (rules and variable values) that results from reading  the
            makefiles;  then execute as usual or as otherwise specified.  This also prints
            the version information given by the -v switch (see below).  To print the data
            base without trying to remake any files, use make -p -f/dev/null.

       -q, --question
            ''Question mode''.  Do not run any commands, or print anything; just return an
            exit status that is zero if the specified targets  are  already  up  to  date,
            nonzero otherwise.

       -r, --no-builtin-rules
            Eliminate use of the built-in implicit rules.  Also clear out the default list
            of suffixes for suffix rules.

       -R, --no-builtin-variables
            Don't define any built-in variables.

       -s, --silent, --quiet
            Silent operation; do not print the commands as they are executed.

       -S, --no-keep-going, --stop
            Cancel the effect of the -k option.  This  is  never  necessary  except  in  a
            recursive  make  where -k might be inherited from the top-level make via MAKE-
            FLAGS or if you set -k in MAKEFLAGS in your environment.

       -t, --touch
            Touch files (mark them up to date without really  changing  them)  instead  of
            running  their commands.  This is used to pretend that the commands were done,
            in order to fool future invocations of make.

       -v, --version
            Print the version of the make program plus a copyright, a list of authors  and
            a notice that there is no warranty.

       -w, --print-directory
            Print  a  message containing the working directory before and after other pro-
            cessing.  This may be useful for tracking down errors from  complicated  nests
            of recursive make commands.

       --no-print-directory
            Turn off -w, even if it was turned on implicitly.

       -W file, --what-if=file, --new-file=file, --assume-new=file
            Pretend  that  the  target file has just been modified.  When used with the -n
            flag, this shows you what would happen if you were to modify that file.  With-
            out  -n,  it  is  almost the same as running a touch command on the given file
            before running make, except that the modification time is changed only in  the
            imagination of make.

       --warn-undefined-variables
            Warn when an undefined variable is referenced.

EXIT STATUS
       GNU  make exits with a status of zero if all makefiles were successfully parsed and
       no targets that were built failed.  A status of one will be returned if the -q flag
       was  used  and  make determines that a target needs to be rebuilt.  A status of two
       will be returned if any errors were encountered.

SEE ALSO
       The GNU Make Manual

BUGS
       See the chapter 'Problems and Bugs' in The GNU Make Manual.

AUTHOR
       This manual page contributed by Dennis Morse of Stanford University.  It  has  been
       reworked by Roland McGrath.  Further updates contributed by Mike Frysinger.

COPYRIGHT
       Copyright  (C)  1992, 1993, 1996, 1999 Free Software Foundation, Inc.  This file is
       part of GNU make.

       GNU make is free software; you can redistribute it and/or modify it under the terms
       of  the  GNU  General  Public License as published by the Free Software Foundation;
       either version 2, or (at your option) any later version.

       GNU make is distributed in the hope that it will be useful, but  WITHOUT  ANY  WAR-
       RANTY;  without  even the implied warranty of MERCHANTABILITY or FITNESS FOR A PAR-
       TICULAR PURPOSE.  See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License  along  with  GNU
       make;  see  the file COPYING.  If not, write to the Free Software Foundation, Inc.,
       51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.



GNU                             22 August 1989                         MAKE(1)

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