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.
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-b, -m
These options are ignored for compatibility with other versions of make.
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-B, --always-make
Unconditionally make all targets.
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-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 previous one: -C / -C etc is equivalent to -C
/etc. This is typically used with recursive invocations of make.
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-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---everything interesting about how make decides what to do.
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--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.
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-e, --environment-overrides
Give variables taken from the environment precedence over variables from makefiles.
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-f file, --file=file, --makefile=FILE
Use file as a makefile.
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-i, --ignore-errors
Ignore all errors in commands executed to remake files.
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-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, directories 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
preprocessor's -I flag.
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-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.
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-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.
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-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.
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-L, --check-symlink-times
Use the latest mtime between symlinks and target.
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-n, --just-print, --dry-run, --recon
Print the commands that would be executed, but do not execute them.
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-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.
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-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.
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-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.
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-r, --no-builtin-rules
Eliminate use of the built-in implicit rules. Also clear out the default list of suffixes for
suffix rules.
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-R, --no-builtin-variables
Don't define any built-in variables.
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-s, --silent, --quiet
Silent operation; do not print the commands as they are executed.
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-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 MAKEFLAGS or if you set -k in MAKEFLAGS in your
environment.
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-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.
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-v, --version
Print the version of the make program plus a copyright, a list of authors and a notice that there is
no warranty.
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-w, --print-directory
Print a message containing the working directory before and after other processing. This may be
useful for tracking down errors from complicated nests of recursive make commands.
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--no-print-directory
Turn off -w, even if it was turned on implicitly.
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-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. Without -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.
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--warn-undefined-variables
Warn when an undefined variable is referenced.
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