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15daksh-2003 e135fd8e44 Makefiles: Group parallel build output via GNU Make --output-sync 
A parallel `cmake --build` with a Makefiles generator interleaved the
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.. cmake-manual-description: CMake Command-Line Reference
cmake(1)
********
Synopsis
========
.. parsed-literal::
`Generate a Project Buildsystem`_
cmake [<options>] -B <path-to-build> [-S <path-to-source>]
cmake [<options>] <path-to-source | path-to-existing-build>
`Build a Project`_
cmake --build <dir> [<options>] [-- <build-tool-options>]
`Install a Project`_
cmake --install <dir> [<options>]
`Open a Project`_
cmake --open <dir>
`Run a Script`_
cmake [-D <var>=<value>]... -P <cmake-script-file>
`Run a Command-Line Tool`_
cmake -E <command> [<options>]
`Run the Find-Package Tool`_
cmake --find-package [<options>]
`Run a Workflow Preset`_
cmake --workflow <options>
`View Help`_
cmake --help[-<topic>]
Description
===========
The :program:`cmake` executable is the command-line interface of the cross-platform
buildsystem generator CMake. The above `Synopsis`_ lists various actions
the tool can perform as described in sections below.
To build a software project with CMake, `Generate a Project Buildsystem`_.
Optionally use :program:`cmake` to `Build a Project`_, `Install a Project`_ or just
run the corresponding build tool (e.g. ``make``) directly. :program:`cmake` can also
be used to `View Help`_.
The other actions are meant for use by software developers writing
scripts in the :manual:`CMake language <cmake-language(7)>` to support
their builds.
For graphical user interfaces that may be used in place of :program:`cmake`,
see :manual:`ccmake <ccmake(1)>` and :manual:`cmake-gui <cmake-gui(1)>`.
For command-line interfaces to the CMake testing and packaging facilities,
see :manual:`ctest <ctest(1)>` and :manual:`cpack <cpack(1)>`.
For more information on CMake at large, `see also`_ the links at the end
of this manual.
Introduction to CMake Buildsystems
==================================
A *buildsystem* describes how to build a project's executables and libraries
from its source code using a *build tool* to automate the process. For
example, a buildsystem may be a ``Makefile`` for use with a command-line
``make`` tool or a project file for an Integrated Development Environment
(IDE). In order to avoid maintaining multiple such buildsystems, a project
may specify its buildsystem abstractly using files written in the
:manual:`CMake language <cmake-language(7)>`. From these files CMake
generates a preferred buildsystem locally for each user through a backend
called a *generator*.
To generate a buildsystem with CMake, the following must be selected:
Source Tree
The top-level directory containing source files provided by the project.
The project specifies its buildsystem using files as described in the
:manual:`cmake-language(7)` manual, starting with a top-level file named
``CMakeLists.txt``. These files specify build targets and their
dependencies as described in the :manual:`cmake-buildsystem(7)` manual.
Build Tree
The top-level directory in which buildsystem files and build output
artifacts (e.g. executables and libraries) are to be stored.
CMake will write a ``CMakeCache.txt`` file to identify the directory
as a build tree and store persistent information such as buildsystem
configuration options.
To maintain a pristine source tree, perform an *out-of-source* build
by using a separate dedicated build tree. An *in-source* build in
which the build tree is placed in the same directory as the source
tree is also supported, but discouraged.
Generator
This chooses the kind of buildsystem to generate. See the
:manual:`cmake-generators(7)` manual for documentation of all generators.
Run :option:`cmake --help` to see a list of generators available locally.
Optionally use the :cmake-option:`-G` option below to specify a generator,
or simply accept the default CMake chooses for the current platform.
When using one of the :ref:`Command-Line Build Tool Generators`
CMake expects that the environment needed by the compiler toolchain
is already configured in the shell. When using one of the
:ref:`IDE Build Tool Generators`, no particular environment is needed.
.. _`Generate a Project Buildsystem`:
Generate a Project Buildsystem
==============================
Run CMake with one of the following command signatures to specify the
source and build trees and generate a buildsystem:
``cmake [<options>] -B <path-to-build> [-S <path-to-source>]``
.. versionadded:: 3.13
Uses ``<path-to-build>`` as the build tree and ``<path-to-source>``
as the source tree. The specified paths may be absolute or relative
to the current working directory. The source tree must contain a
``CMakeLists.txt`` file. The build tree will be created automatically
if it does not already exist. For example:
.. code-block:: console
$ cmake -S src -B build
``cmake [<options>] <path-to-source>``
Uses the current working directory as the build tree, and
``<path-to-source>`` as the source tree. The specified path may
be absolute or relative to the current working directory.
The source tree must contain a ``CMakeLists.txt`` file and must
*not* contain a ``CMakeCache.txt`` file because the latter
identifies an existing build tree. For example:
.. code-block:: console
$ mkdir build ; cd build
$ cmake ../src
``cmake [<options>] <path-to-existing-build>``
Uses ``<path-to-existing-build>`` as the build tree, and loads the
path to the source tree from its ``CMakeCache.txt`` file, which must
have already been generated by a previous run of CMake. The specified
path may be absolute or relative to the current working directory.
For example:
.. code-block:: console
$ cd build
$ cmake .
In all cases the ``<options>`` may be zero or more of the `Options`_ below.
The above styles for specifying the source and build trees may be mixed.
Paths specified with :cmake-option:`-S` or :cmake-option:`-B` are always
classified as source or build trees, respectively. Paths specified with plain
arguments are classified based on their content and the types of paths given
earlier. If only one type of path is given, the current working directory
(cwd) is used for the other. For example:
============================== ============ ===========
Command Line Source Dir Build Dir
============================== ============ ===========
``cmake -B build`` *cwd* ``build``
``cmake -B build src`` ``src`` ``build``
``cmake -B build -S src`` ``src`` ``build``
``cmake src`` ``src`` *cwd*
``cmake build`` (existing) *loaded* ``build``
``cmake -S src`` ``src`` *cwd*
``cmake -S src build`` ``src`` ``build``
``cmake -S src -B build`` ``src`` ``build``
============================== ============ ===========
.. versionchanged:: 3.23
CMake warns when multiple source paths are specified. This has never
been officially documented or supported, but older versions accidentally
accepted multiple source paths and used the last path specified.
Avoid passing multiple source path arguments.
After generating a buildsystem one may use the corresponding native
build tool to build the project. For example, after using the
:generator:`Unix Makefiles` generator one may run ``make`` directly:
.. code-block:: console
$ make
$ make install
Alternatively, one may use :program:`cmake` to `Build a Project`_ by
automatically choosing and invoking the appropriate native build tool.
.. _`CMake Options`:
Options
-------
.. program:: cmake
.. include:: include/OPTIONS_BUILD.rst
.. option:: --fresh
.. versionadded:: 3.24
Perform a fresh configuration of the build tree.
This removes any existing ``CMakeCache.txt`` file and associated
``CMakeFiles/`` directory, and recreates them from scratch.
.. versionchanged:: 3.30
For dependencies previously populated by :module:`FetchContent` with the
``NEW`` setting for policy :policy:`CMP0168`, their stamp and script files
from any previous run will be removed. The download, update, and patch
steps will therefore be forced to re-execute.
.. option:: -L[A][H]
List non-advanced cached variables.
List ``CACHE`` variables will run CMake and list all the variables from
the CMake ``CACHE`` that are not marked as ``INTERNAL`` or
:prop_cache:`ADVANCED`. This will effectively display current CMake
settings, which can then be changed with :cmake-option:`-D` option.
Changing some of the variables may result in more variables being created.
If ``A`` is specified, then it will display also advanced variables.
If ``H`` is specified, it will also display help for each variable.
.. option:: -LR[A][H] <regex>
.. versionadded:: 3.31
Show specific non-advanced cached variables
Show non-``INTERNAL`` nor :prop_cache:`ADVANCED` variables from the CMake
``CACHE`` that match the given regex. If ``A`` is specified, then it
will also show advanced variables. If ``H`` is specified, it will also
display help for each variable.
.. option:: -N
View mode only.
Only load the cache. Do not actually run configure and generate
steps.
.. option:: --graphviz=<file>
Generate `Graphviz <https://www.graphviz.org/>`_ of dependencies
This option generates a graphviz input file that will contain all the
library and executable dependencies in the project showing the
dependencies between the targets in a project, as well as external libraries
which are linked against.
When running CMake with the ``--graphviz=foo.dot`` option, it produces:
* a ``foo.dot`` file, showing all dependencies in the project
* a ``foo.dot.<target>`` file for each target, showing on which other targets
it depends
* a ``foo.dot.<target>.dependers`` file for each target, showing which other
targets depend on it
Those .dot files can be converted to images using the *dot* command from the
Graphviz package:
.. code-block:: shell
dot -Tpng -o foo.png foo.dot
.. versionadded:: 3.10
The different dependency types ``PUBLIC``, ``INTERFACE`` and ``PRIVATE``
are represented as solid, dashed and dotted edges.
.. rubric:: Variables specific to the Graphviz support
The resulting graphs can be huge. The look and content of the generated graphs
can be controlled using the file ``CMakeGraphVizOptions.cmake``. This file is
first searched in :variable:`CMAKE_BINARY_DIR`, and then in
:variable:`CMAKE_SOURCE_DIR`. If found, the variables set in it are used to
adjust options for the generated Graphviz files.
.. variable:: GRAPHVIZ_GRAPH_NAME
The graph name.
* Mandatory: NO
* Default: value of :variable:`CMAKE_PROJECT_NAME`
.. variable:: GRAPHVIZ_GRAPH_HEADER
The header written at the top of the Graphviz files.
* Mandatory: NO
* Default: "node [ fontsize = "12" ];"
.. variable:: GRAPHVIZ_NODE_PREFIX
The prefix for each node in the Graphviz files.
* Mandatory: NO
* Default: "node"
.. variable:: GRAPHVIZ_EXECUTABLES
Set to FALSE to exclude executables from the generated graphs.
* Mandatory: NO
* Default: TRUE
.. variable:: GRAPHVIZ_STATIC_LIBS
Set to FALSE to exclude static libraries from the generated graphs.
* Mandatory: NO
* Default: TRUE
.. variable:: GRAPHVIZ_SHARED_LIBS
Set to FALSE to exclude shared libraries from the generated graphs.
* Mandatory: NO
* Default: TRUE
.. variable:: GRAPHVIZ_MODULE_LIBS
Set to FALSE to exclude module libraries from the generated graphs.
* Mandatory: NO
* Default: TRUE
.. variable:: GRAPHVIZ_INTERFACE_LIBS
Set to FALSE to exclude interface libraries from the generated graphs.
* Mandatory: NO
* Default: TRUE
.. variable:: GRAPHVIZ_OBJECT_LIBS
Set to FALSE to exclude object libraries from the generated graphs.
* Mandatory: NO
* Default: TRUE
.. variable:: GRAPHVIZ_UNKNOWN_LIBS
Set to FALSE to exclude unknown libraries from the generated graphs.
* Mandatory: NO
* Default: TRUE
.. variable:: GRAPHVIZ_EXTERNAL_LIBS
Set to FALSE to exclude external libraries from the generated graphs.
* Mandatory: NO
* Default: TRUE
.. variable:: GRAPHVIZ_CUSTOM_TARGETS
Set to TRUE to include custom targets in the generated graphs.
* Mandatory: NO
* Default: FALSE
.. variable:: GRAPHVIZ_IGNORE_TARGETS
A list of regular expressions for names of targets to exclude from the
generated graphs.
* Mandatory: NO
* Default: empty
.. variable:: GRAPHVIZ_GENERATE_PER_TARGET
Set to FALSE to not generate per-target graphs ``foo.dot.<target>``.
* Mandatory: NO
* Default: TRUE
.. variable:: GRAPHVIZ_GENERATE_DEPENDERS
Set to FALSE to not generate depender graphs ``foo.dot.<target>.dependers``.
* Mandatory: NO
* Default: TRUE
.. option:: --system-information [file]
Dump information about this system.
Dump a wide range of information about the current system. If run
from the top of a binary tree for a CMake project it will dump
additional information such as the cache, log files etc.
.. option:: --print-config-dir
.. versionadded:: 3.31
Print CMake config directory for user-wide FileAPI queries.
See :envvar:`CMAKE_CONFIG_DIR` for more details.
.. option:: --log-level=<level>
.. versionadded:: 3.16
Set the log ``<level>``.
The :command:`message` command will only output messages of the specified
log level or higher. The valid log levels are ``ERROR``, ``WARNING``,
``NOTICE``, ``STATUS`` (default), ``VERBOSE``, ``DEBUG``, or ``TRACE``.
To make a log level persist between CMake runs, set
:variable:`CMAKE_MESSAGE_LOG_LEVEL` as a cache variable instead.
If both the command line option and the variable are given, the command line
option takes precedence.
For backward compatibility reasons, ``--loglevel`` is also accepted as a
synonym for this option.
.. versionadded:: 3.25
See the :command:`cmake_language(GET_MESSAGE_LOG_LEVEL)` command for a way
to query the current message logging level.
.. option:: --log-context
Enable the :command:`message` command outputting context attached to each
message.
This option turns on showing context for the current CMake run only.
To make showing the context persistent for all subsequent CMake runs, set
:variable:`CMAKE_MESSAGE_CONTEXT_SHOW` as a cache variable instead.
When this command line option is given, :variable:`CMAKE_MESSAGE_CONTEXT_SHOW`
is ignored.
.. option:: --sarif-output=<path>
.. versionadded:: 4.0
Enable logging of diagnostic messages produced by CMake in the SARIF format.
Write diagnostic messages to a SARIF file at the path specified. Projects can
also set :variable:`CMAKE_EXPORT_SARIF` to ``ON`` to enable this feature for a
build tree.
.. option:: --debug-trycompile
Do not delete the files and directories created for
:command:`try_compile` / :command:`try_run` calls.
This is useful in debugging failed checks.
Note that some uses of :command:`try_compile` may use the same build tree,
which will limit the usefulness of this option if a project executes more
than one :command:`try_compile`. For example, such uses may change results
as artifacts from a previous try-compile may cause a different test to either
pass or fail incorrectly. This option is best used only when debugging.
(With respect to the preceding, the :command:`try_run` command
is effectively a :command:`try_compile`. Any combination of the two
is subject to the potential issues described.)
.. versionadded:: 3.25
When this option is enabled, every try-compile check prints a log
message reporting the directory in which the check is performed.
.. option:: --debug-output
Put cmake in a debug mode.
Print extra information during the cmake run like stack traces with
:command:`message(SEND_ERROR)` calls.
.. option:: --debug-find
.. versionadded:: 3.17
Put cmake find commands in a debug mode.
Print extra find call information during the cmake run to standard
error. Output is designed for human consumption and not for parsing.
See also the :variable:`CMAKE_FIND_DEBUG_MODE` variable for debugging
a more local part of the project.
.. option:: --debug-find-pkg=<pkg>[,...]
.. versionadded:: 3.23
Put cmake find commands in a debug mode when running under calls
to :command:`find_package(\<pkg\>) <find_package>`, where ``<pkg>``
is an entry in the given comma-separated list of case-sensitive package
names.
Like :cmake-option:`--debug-find`, but limiting scope
to the specified packages.
.. option:: --debug-find-var=<var>[,...]
.. versionadded:: 3.23
Put cmake find commands in a debug mode when called with ``<var>``
as the result variable, where ``<var>`` is an entry in the given
comma-separated list.
Like :cmake-option:`--debug-find`, but limiting scope
to the specified variable names.
.. option:: --trace
Put cmake in trace mode.
Print a trace of all calls made and from where.
.. option:: --trace-expand
Put cmake in trace mode.
Like :cmake-option:`--trace`, but with variables expanded.
.. option:: --trace-format=<format>
.. versionadded:: 3.17
Put cmake in trace mode and sets the trace output format.
``<format>`` can be one of the following values.
``human``
Prints each trace line in a human-readable format. This is the
default format.
``json-v1``
Prints each line as a separate JSON document. Each document is
separated by a newline (``\n``). It is guaranteed that no
newline characters will be present inside a JSON document.
.. code-block:: json
:caption: JSON trace format
{
"file": "/full/path/to/the/CMake/file.txt",
"line": 0,
"cmd": "add_executable",
"args": ["foo", "bar"],
"time": 1579512535.9687231,
"frame": 2,
"global_frame": 4
}
The members are:
``file``
The full path to the CMake source file where the function
was called.
``line``
The line in ``file`` where the function call begins.
``line_end``
If the function call spans multiple lines, this field will
be set to the line where the function call ends. If the function
calls spans a single line, this field will be unset. This field
was added in minor version 2 of the ``json-v1`` format.
``defer``
Optional member that is present when the function call was deferred
by :command:`cmake_language(DEFER)`. If present, its value is a
string containing the deferred call ``<id>``.
``cmd``
The name of the function that was called.
``args``
A string list of all function parameters.
``time``
Timestamp (seconds since epoch) of the function call.
``frame``
Stack frame depth of the function that was called, within the
context of the ``CMakeLists.txt`` being processed currently.
``global_frame``
Stack frame depth of the function that was called, tracked globally
across all ``CMakeLists.txt`` files involved in the trace. This field
was added in minor version 2 of the ``json-v1`` format.
Additionally, the first JSON document outputted contains the
``version`` key for the current major and minor version of the
.. code-block:: json
:caption: JSON version format
{
"version": {
"major": 1,
"minor": 2
}
}
The members are:
``version``
Indicates the version of the JSON format. The version has a
major and minor components following semantic version conventions.
.. option:: --trace-source=<file>
Put cmake in trace mode, but output only lines of a specified file.
Multiple options are allowed.
.. option:: --trace-redirect=<file>
Put cmake in trace mode and redirect trace output to a file instead of stderr.
.. option:: --warn-uninitialized
.. deprecated:: 4.4
Compatibility synonym for ``-Wuninitialized``.
.. option:: --warn-unused-vars
.. deprecated:: 3.19
Does nothing. In CMake versions 3.2 and below this enabled warnings about
unused variables. In CMake versions 3.3 through 3.18 the option was broken.
In CMake 3.19 and above the option has been removed.
.. option:: --no-warn-unused-cli
.. deprecated:: 4.4
Compatibility synonym for ``-Wno-unused-cli``.
.. option:: --check-system-vars
Find problems with variable usage in system files.
Normally, unused and uninitialized variables are searched for only
in :variable:`CMAKE_SOURCE_DIR` and :variable:`CMAKE_BINARY_DIR`.
This flag tells CMake to warn about other files as well.
.. option:: --compile-no-warning-as-error
.. versionadded:: 3.24
Ignore target property :prop_tgt:`COMPILE_WARNING_AS_ERROR` and variable
:variable:`CMAKE_COMPILE_WARNING_AS_ERROR`, preventing warnings from being
treated as errors on compile.
.. option:: --link-no-warning-as-error
.. versionadded:: 4.0
Ignore target property :prop_tgt:`LINK_WARNING_AS_ERROR` and variable
:variable:`CMAKE_LINK_WARNING_AS_ERROR`, preventing warnings from being
treated as errors on link.
.. option:: --profiling-output=<path>
.. versionadded:: 3.18
Used in conjunction with :cmake-option:`--profiling-format`
to output to a given path.
.. option:: --profiling-format=<file>
Enable the output of profiling data of CMake script in the given format.
This can aid performance analysis of CMake scripts executed. Third party
applications should be used to process the output into human readable format.
Currently supported values are:
``google-trace`` Outputs in Google Trace Format, which can be parsed by the
about:tracing tab of Google Chrome or using a plugin for a tool like Trace
Compass.
.. option:: --preset <preset>, --preset=<preset>
Reads a :manual:`preset <cmake-presets(7)>` from CMake presets files.
``CMakePresets.json`` and ``CMakeUserPresets.json`` are the default files,
which must be located in the same directory as the top level
``CMakeLists.txt`` file. A file can also be specified with
:cmake-option:`--presets-file`.
The preset may specify the generator, the build directory, a list of
variables, and other arguments to pass to CMake.
The :manual:`CMake GUI <cmake-gui(1)>` also recognizes and supports
``CMakePresets.json`` and ``CMakeUserPresets.json`` files. For full details
on these files, see :manual:`cmake-presets(7)`.
The presets are read before all other command line options, although the
:cmake-option:`-S` option can be used to specify the source directory
containing the ``CMakePresets.json`` and ``CMakeUserPresets.json`` files.
If neither :cmake-option:`-S` nor :cmake-option:`--presets-file` are given,
the current working directory is assumed to be the top level source directory
and must contain ``CMakePresets.json`` and/or ``CMakeUserPresets.json``.
The options specified by the chosen preset (variables, generator, etc.)
can all be overridden by manually specifying them on the command line.
For example, if the preset sets a variable called ``MYVAR`` to ``1``,
but the user sets it to ``2`` with a :cmake-option:`-D` argument,
the value ``2`` is preferred.
.. versionadded:: 3.21
The :cmake-option:`-B` option may optionally be specified with a different
binary directory than the one specified by the
:preset:`configurePresets.binaryDir` field.
.. versionchanged:: 4.4
If :cmake-option:`--presets-file` is specified, neither of
``CMakePresets.json`` nor ``CMakeUserPresets.json`` are required to be
present. In prior versions, the presence of these files in the top-level
source directory (whether via :cmake-option:`-S` or the current working
directory) was strictly required.
.. option:: --presets-file <file>, --presets-file=<file>
.. versionadded:: 4.4
Reads :manual:`presets <cmake-presets(7)>` from the given ``<file>``. The
specified path may be absolute or relative to the current working directory.
If ``--presets-file`` is given, presets defined in ``CMakePresets.json`` and
``CMakeUserPresets.json`` will be ignored.
.. option:: --list-presets[=<type>]
Lists the available presets of the specified ``<type>``. Valid values for
``<type>`` are ``configure``, ``build``, ``test``, ``package``, or ``all``.
If ``<type>`` is omitted, ``configure`` is assumed.
.. versionchanged:: 4.4
If :cmake-option:`--presets-file` is specified, the presets defined in the
given ``<file>`` will be listed. Otherwise, the top-level source directory
(whether via :cmake-option:`-S` or the current working directory) must
contain ``CMakePresets.json`` and/or ``CMakeUserPresets.json``.
In prior versions, the latter was strictly required.
.. option:: --debugger
Enables interactive debugging of the CMake language. CMake exposes a
debugging interface on the pipe named by :cmake-option:`--debugger-pipe`
that conforms to the `Debug Adapter Protocol`_ specification with the
following modifications.
The ``initialize`` response includes an additional field named
``cmakeVersion`` which specifies the version of CMake being debugged.
.. code-block:: json
:caption: Debugger initialize response
{
"cmakeVersion": {
"major": 3,
"minor": 27,
"patch": 0,
"full": "3.27.0"
}
}
The members are:
``major``
An integer specifying the major version number.
``minor``
An integer specifying the minor version number.
``patch``
An integer specifying the patch version number.
``full``
A string specifying the full CMake version.
.. _`Debug Adapter Protocol`: https://microsoft.github.io/debug-adapter-protocol/
.. option:: --debugger-pipe <pipe name>, --debugger-pipe=<pipe name>
Name of the pipe (on Windows) or domain socket (on Unix) to use for
debugger communication.
.. option:: --debugger-dap-log <log path>, --debugger-dap-log=<log path>
Logs all debugger communication to the specified file.
.. _`Build Tool Mode`:
Build a Project
===============
.. program:: cmake
CMake provides a command-line signature to build an already-generated
project binary tree:
.. code-block:: shell
cmake --build <dir> [<options>] [-- <build-tool-options>]
cmake --build [<dir>] --preset <preset> [<options>] [-- <build-tool-options>]
This abstracts a native build tool's command-line interface with the
following options:
.. option:: --build <dir>
Project binary directory to be built. This is required (unless a preset
is specified) and must be first.
.. program:: cmake--build
.. option:: --preset <preset>, --preset=<preset>
Use a build :manual:`preset <cmake-presets(7)>` to specify build options.
The project binary directory is inferred from the
:preset:`buildPresets.configurePreset` key unless a directory is specified
after ``--build``.
.. versionadded:: 4.3
``cmake --build`` now supports specifying a build directory and
preset together.
.. versionchanged:: 4.4
``cmake --build <dir> --preset`` no longer needs to be called from the
directory containing ``CMakePresets.json`` or ``CMakeUserPresets.json``.
If :cmake-build-option:`--presets-file` is specified, CMake will use that
file; otherwise, the presets file(s) can be inferred from the current
build directory's ``CMakeCache.txt``.
.. option:: --presets-file <file>, --presets-file=<file>
.. versionadded:: 4.4
Reads :manual:`presets <cmake-presets(7)>` from the given ``<file>``. The
specified path may be absolute or relative to the current working directory.
If ``--presets-file`` is given, presets defined in ``CMakePresets.json`` and
``CMakeUserPresets.json`` will be ignored.
.. option:: --list-presets
Lists the available build presets.
.. versionchanged:: 4.4
``cmake --build <dir> --list-presets`` no longer needs to be called from
the directory containing ``CMakePresets.json`` or ``CMakeUserPresets.json``.
If :cmake-build-option:`--presets-file` is specified, only presets defined
in the given ``<file>`` will be listed; otherwise, the presets file(s) are
inferred from the current build directory's ``CMakeCache.txt``.
.. option:: -j [<jobs>], --parallel [<jobs>]
.. versionadded:: 3.12
The maximum number of concurrent processes to use when building.
If ``<jobs>`` is omitted the native build tool's default number is used.
The :envvar:`CMAKE_BUILD_PARALLEL_LEVEL` environment variable, if set,
specifies a default parallel level when this option is not given.
Some native build tools always build in parallel. The use of ``<jobs>``
value of ``1`` can be used to limit to a single job.
.. versionadded:: 4.5
When CMake is the one passing the parallel flag to the build tool (through
this option or the :envvar:`CMAKE_BUILD_PARALLEL_LEVEL` environment
variable) and that tool is GNU Make 4.0 or newer, the output of each
recipe is grouped so that concurrent jobs do not interleave. Request
parallelism natively, e.g. ``cmake --build . -- -j``, to opt out and
stream output as it is produced. Since
:envvar:`CMAKE_BUILD_PARALLEL_LEVEL` likewise enables grouping, unset it
to opt out when it is set.
.. option:: -t <tgt>..., --target <tgt>...
Build ``<tgt>`` instead of the default target. Multiple targets may be
given, separated by spaces.
.. option:: --config <cfg>
For multi-configuration tools, choose configuration ``<cfg>``.
.. option:: --clean-first
Build target ``clean`` first, then build.
(To clean only, use :option:`--target clean <cmake--build --target>`.)
.. option:: --resolve-package-references=<value>
.. versionadded:: 3.23
Resolve remote package references from external package managers (e.g. NuGet)
before build. When ``<value>`` is set to ``on`` (default), packages will be
restored before building a target. When ``<value>`` is set to ``only``, the
packages will be restored, but no build will be performed. When
``<value>`` is set to ``off``, no packages will be restored.
If the target does not define any package references, this option does nothing.
This setting can be specified in a build preset (using
``resolvePackageReferences``). The preset setting will be ignored, if this
command line option is specified.
If no command line parameter or preset option are provided, an environment-
specific cache variable will be evaluated to decide, if package restoration
should be performed.
When using :ref:`Visual Studio Generators`, package references are defined
using the :prop_tgt:`VS_PACKAGE_REFERENCES` property. Package references
are restored using NuGet. It can be disabled by setting the
``CMAKE_VS_NUGET_PACKAGE_RESTORE`` variable to ``OFF``.
.. option:: --use-stderr
Ignored. Behavior is default in CMake >= 3.0.
.. option:: -v, --verbose
Enable verbose output - if supported - including the build commands to be
executed.
This option can be omitted if :envvar:`VERBOSE` environment variable or
:variable:`CMAKE_VERBOSE_MAKEFILE` cached variable is set.
.. option:: --
Pass remaining options to the native tool.
Run :option:`cmake --build` with no options for quick help.
Generator-Specific Build Tool Behavior
--------------------------------------
``cmake --build`` has special behavior with some generators:
:generator:`Xcode`
.. versionadded:: 4.1
If a third-party tool has written a ``.xcworkspace`` next to
the CMake-generated ``.xcodeproj``, ``cmake --build`` drives
the build through the workspace instead.
Install a Project
=================
.. program:: cmake
CMake provides a command-line signature to install an already-generated
project binary tree:
.. code-block:: shell
cmake --install <dir> [<options>]
This may be used after building a project to run installation without
using the generated build system or the native build tool.
The options are:
.. option:: --install <dir>
Project binary directory to install. This is required and must be first.
.. program:: cmake--install
.. option:: --config <cfg>
For multi-configuration generators, choose configuration ``<cfg>``.
.. option:: --component <comp>
Component-based install. Only install component ``<comp>``.
.. versionadded:: 4.4
Supports installing more than one component:
* ``--component <compA> <compB>``
* ``--component <compA> --component <compB>``
.. option:: --default-directory-permissions <permissions>
Default directory install permissions. Permissions in format ``<u=rwx,g=rx,o=rx>``.
.. option:: --prefix <prefix>
Specifies an alternative installation prefix, temporarily replacing the
value of the :variable:`CMAKE_INSTALL_PREFIX` variable at the installation
phase.
The main purpose of this option is to allow installation to occur in an
arbitrary location. This is commonly used in certain installation and
packaging workflows. It is analogous to selecting the installation
directory during the installation phase. For example, on Windows, where
a user may choose the destination folder for the project.
.. note::
When the project is using the :module:`GNUInstallDirs` module, there are
some :ref:`special cases <GNUInstallDirs special cases>` that are
evaluated based on the value of the :variable:`CMAKE_INSTALL_PREFIX`
variable during the configuration phase. The results persist even if an
alternative prefix is used during installation.
.. option:: --strip
Strip before installing.
.. option:: -v, --verbose
Enable verbose output.
This option can be omitted if :envvar:`VERBOSE` environment variable is set.
.. option:: -j <jobs>, --parallel <jobs>
.. versionadded:: 3.31
Install in parallel using the given number of jobs. Only available if
:prop_gbl:`INSTALL_PARALLEL` is enabled. The
:envvar:`CMAKE_INSTALL_PARALLEL_LEVEL` environment variable specifies a
default parallel level when this option is not provided.
Run :option:`cmake --install` with no options for quick help.
Open a Project
==============
.. program:: cmake
.. code-block:: shell
cmake --open <dir>
Open the generated project in the associated application. This is only
supported by some generators.
.. _`Script Processing Mode`:
Run a Script
============
.. program:: cmake
.. code-block:: shell
cmake [-D <var>=<value>]... -P <cmake-script-file> [-- <unparsed-options>...]
.. program:: cmake-P
.. option:: -D <var>=<value>
Define a variable for script mode.
.. program:: cmake
.. option:: -P <cmake-script-file>
Process the given cmake file as a script written in the CMake
language. No configure or generate step is performed and the cache
is not modified. If variables are defined using ``-D``, this must be
done before the ``-P`` argument.
Any options after ``--`` are not parsed by CMake, but they are still included
in the set of :variable:`CMAKE_ARGV<n> <CMAKE_ARGV0>` variables passed to the
script (including the ``--`` itself).
.. _`Run a Command-Line Tool`:
Run a Command-Line Tool
=======================
.. program:: cmake
CMake provides builtin command-line tools through the signature
.. code-block:: shell
cmake -E <command> [<options>]
.. option:: -E [help]
Run ``cmake -E`` or ``cmake -E help`` for a summary of commands.
.. program:: cmake-E
Available commands are:
.. option:: bin2c [<options>...] [--] [<input-file> [<output-file>]]
.. versionadded:: 4.3
Convert a binary file to a C array. If input file is unspecified or ``-``,
read from standard input instead of a file. If output file is unspecified or
``-``, write to standard output instead of a file.
By default, this prints only the bytes. Enclosing text can be added with the
``--template-file`` argument. You can also ``#include`` the bytes from
another file, acting as a drop-in replacement for the ``#embed`` directive
from C23 and C++26:
.. code-block:: c
unsigned char my_bytes[] = {
/* #embed "bin2c_input.bin" */
#include "bin2c_output.c.txt"
};
.. program:: cmake-E_bin2c
.. option:: --signed
Print the bytes as signed integers rather than unsigned.
.. option:: --decimal
Print the bytes as decimal rather than hexadecimal.
.. option:: --trailing-comma
Append a trailing comma after the last byte (not included by default.)
.. option:: --template-file <template-file>
Format from a template file. The template file contains placeholders for
the array and optionally the length (which will be a non-negative decimal
integer). Such placeholders are enclosed in ``@`` at the beginning and end
of the placeholder. This functionality is similar to
:command:`configure_file` called with the ``@ONLY`` argument, but only the
array and length placeholders will be replaced, and any other placeholders
will be left as-is.
An example of a potential template file:
.. code-block:: text
unsigned char my_bytes[] = {@array@};
size_t length = @length@;
The array placeholder may occur at most once in the template file. The
length placeholder may occur zero or more times after the array
placeholder, but not before it.
Note that the length is the number of elements printed, and may not match
the ``sizeof`` the resulting array if a type other than ``unsigned char``
is used.
.. option:: --template-array-placeholder <placeholder-name>
Specify a name for the array placeholder in the template file. Set to
``array`` by default.
.. option:: --template-length-placeholder <placeholder-name>
Specify a name for the length placeholder in the template file. Set to
``length`` by default.
.. program:: cmake-E
.. option:: capabilities
.. versionadded:: 3.7
Report cmake capabilities in JSON format. The output is a JSON object
with the following keys:
``version``
A JSON object with version information. Keys are:
``string``
The full version string as displayed by cmake :cmake-option:`--version`.
``major``
The major version number in integer form.
``minor``
The minor version number in integer form.
``patch``
The patch level in integer form.
``suffix``
The cmake version suffix string.
``isDirty``
A bool that is set if the cmake build is from a dirty tree.
``generators``
A list available generators. Each generator is a JSON object with the
following keys:
``name``
A string containing the name of the generator.
``toolsetSupport``
``true`` if the generator supports toolsets and ``false`` otherwise.
``platformSupport``
``true`` if the generator supports platforms and ``false`` otherwise.
``supportedPlatforms``
.. versionadded:: 3.21
Optional member that may be present when the generator supports
platform specification via :variable:`CMAKE_GENERATOR_PLATFORM`
(:option:`-A ... <cmake -A>`). The value is a list of platforms known to
be supported.
``extraGenerators``
A list of strings with all the :ref:`Extra Generators` compatible with
the generator.
``fileApi``
Optional member that is present when the :manual:`cmake-file-api(7)`
is available. The value is a JSON object with one member:
``requests``
A JSON array containing zero or more supported file-api requests.
Each request is a JSON object with members:
``kind``
Specifies one of the supported :ref:`file-api object kinds`.
``version``
A JSON array whose elements are each a JSON object containing
``major`` and ``minor`` members specifying non-negative integer
version components.
``serverMode``
``true`` if cmake supports server-mode and ``false`` otherwise.
Always false since CMake 3.20.
``tls``
.. versionadded:: 3.25
``true`` if TLS support is enabled and ``false`` otherwise.
``debugger``
.. versionadded:: 3.27
``true`` if the :cmake-option:`--debugger` mode is supported
and ``false`` otherwise.
.. option:: cat [--] <files>...
.. versionadded:: 3.18
Concatenate files and print on the standard output.
.. program:: cmake-E_cat
.. option:: --
.. versionadded:: 3.24
Added support for the double dash argument ``--``. This basic implementation
of ``cat`` does not support any options, so using a option starting with
``-`` will result in an error. Use ``--`` to indicate the end of options, in
case a file starts with ``-``.
.. versionadded:: 3.29
``cat`` can now print the standard input by passing the ``-`` argument.
.. versionadded:: 4.4
``cat`` will print the standard input when no arguments are passed.
.. program:: cmake-E
.. option:: chdir <dir> <cmd> [<arg>...]
Change the current working directory and run a command.
.. option:: compare_files [--ignore-eol] <file1> <file2>
Check if ``<file1>`` is same as ``<file2>``. If files are the same,
then returns ``0``, if not it returns ``1``. In case of invalid
arguments, it returns 2.
.. program:: cmake-E_compare_files
.. option:: --ignore-eol
.. versionadded:: 3.14
The option implies line-wise comparison and ignores LF/CRLF differences.
.. program:: cmake-E
.. option:: copy <file>... <destination>,
copy -t <destination> <file>...
Copy files to ``<destination>`` (either file or directory).
If multiple files are specified, or if ``-t`` is specified, the
``<destination>`` must be a directory and it must exist. If ``-t`` is not
specified, the last argument is assumed to be the ``<destination>``.
Wildcards are not supported. ``copy`` does follow symlinks. That means it
does not copy symlinks, but the files or directories it point to.
.. versionadded:: 3.5
Support for multiple input files.
.. versionadded:: 3.26
Support for ``-t`` argument.
.. option:: copy_directory <dir>... <destination>,
copy_directory -t <destination> <dir>...
Copy content of ``<dir>...`` directories to a ``<destination>`` directory.
If the ``<destination>`` directory does not exist it will be created.
If ``-t`` is not specified, the last argument is assumed to be the
``<destination>``.
``copy_directory`` does follow symlinks.
.. versionadded:: 3.5
Support for multiple input directories.
.. versionadded:: 3.15
The command now fails when the source directory does not exist.
Previously it succeeded by creating an empty destination directory.
.. versionadded:: 4.4
Support for the ``-t`` argument.
.. option:: copy_directory_if_different <dir>... <destination>,
copy_directory_if_different -t <destination> <dir>...
.. versionadded:: 3.26
Copy changed content of ``<dir>...`` directories to a ``<destination>`` directory.
If the ``<destination>`` directory does not exist it will be created.
If ``-t`` is not specified, the last argument is assumed to be the
``<destination>``.
``copy_directory_if_different`` does follow symlinks.
The command fails when the source directory does not exist.
.. versionadded:: 4.4
Support for the ``-t`` argument.
.. option:: copy_directory_if_newer <dir>... <destination>,
copy_directory_if_newer -t <destination> <dir>...
.. versionadded:: 4.2
Copy content of ``<dir>...`` directories to a ``<destination>`` directory
if source files are newer than destination files (based on file timestamps).
If the ``<destination>`` directory does not exist it will be created.
If ``-t`` is not specified, the last argument is assumed to be the
``<destination>``.
``copy_directory_if_newer`` does follow symlinks.
The command fails when the source directory does not exist.
This is faster than ``copy_directory_if_different`` as it only compares
file timestamps instead of file contents.
.. versionadded:: 4.4
Support for the ``-t`` argument.
.. option:: copy_if_different <file>... <destination>,
copy_if_different -t <destination> <file>...
Copy files to ``<destination>`` (either file or directory) if
they have changed.
If multiple files are specified, or if ``-t`` is specified,
the ``<destination>`` must be a directory and it must exist.
``copy_if_different`` does follow symlinks.
.. versionadded:: 3.5
Support for multiple input files.
.. versionadded:: 4.4
Support for the ``-t`` argument.
.. option:: copy_if_newer <file>... <destination>,
copy_if_newer -t <destination> <file>...
.. versionadded:: 4.2
Copy files to ``<destination>`` (either file or directory) if
source files are newer than destination files (based on file timestamps).
If multiple files are specified, or if ``-t`` is specified,
the ``<destination>`` must be a directory and it must exist.
``copy_if_newer`` does follow symlinks.
This is faster than ``copy_if_different`` as it only compares
file timestamps instead of file contents.
.. versionadded:: 4.4
Support for the ``-t`` argument.
.. option:: create_symlink <old> <new>
Create a symbolic link ``<new>`` naming ``<old>``.
.. versionadded:: 3.13
Support for creating symlinks on Windows.
.. note::
Path to where ``<new>`` symbolic link will be created has to exist beforehand.
.. option:: create_hardlink <old> <new>
.. versionadded:: 3.19
Create a hard link ``<new>`` naming ``<old>``.
.. note::
Path to where ``<new>`` hard link will be created has to exist beforehand.
``<old>`` has to exist beforehand.
.. option:: echo [<string>...]
Displays arguments as text.
.. option:: echo_append [<string>...]
Displays arguments as text but no new line.
.. option:: env [<options>] [--] <command> [<arg>...]
.. versionadded:: 3.1
Run command in a modified environment. Options are:
.. program:: cmake-E_env
.. option:: NAME=VALUE
Replaces the current value of ``NAME`` with ``VALUE``.
.. option:: --unset=NAME
Unsets the current value of ``NAME``.
.. option:: --modify ENVIRONMENT_MODIFICATION
.. versionadded:: 3.25
Apply a single :prop_test:`ENVIRONMENT_MODIFICATION` operation to the
modified environment.
The ``NAME=VALUE`` and ``--unset=NAME`` options are equivalent to
``--modify NAME=set:VALUE`` and ``--modify NAME=unset:``, respectively.
Note that ``--modify NAME=reset:`` resets ``NAME`` to the value it had
when :program:`cmake` launched (or unsets it), not to the most recent
``NAME=VALUE`` option.
.. option:: --
.. versionadded:: 3.24
Added support for the double dash argument ``--``. Use ``--`` to stop
interpreting options/environment variables and treat the next argument as
the command, even if it start with ``-`` or contains a ``=``.
.. program:: cmake-E
.. option:: environment
Display the current environment variables.
.. option:: false
.. versionadded:: 3.16
Do nothing, with an exit code of 1.
.. option:: make_directory <dir>...
Create ``<dir>`` directories. If necessary, create parent
directories too. If a directory already exists it will be
silently ignored.
.. versionadded:: 3.5
Support for multiple input directories.
.. option:: md5sum <file>...
Create MD5 checksum of files in ``md5sum`` compatible format::
351abe79cd3800b38cdfb25d45015a15 file1.txt
052f86c15bbde68af55c7f7b340ab639 file2.txt
.. versionchanged:: 4.3
Passing ``-`` reads from standard input.
.. option:: sha1sum <file>...
.. versionadded:: 3.10
Create SHA1 checksum of files in ``sha1sum`` compatible format::
4bb7932a29e6f73c97bb9272f2bdc393122f86e0 file1.txt
1df4c8f318665f9a5f2ed38f55adadb7ef9f559c file2.txt
.. versionchanged:: 4.3
Passing ``-`` reads from standard input.
.. option:: sha224sum <file>...
.. versionadded:: 3.10
Create SHA224 checksum of files in ``sha224sum`` compatible format::
b9b9346bc8437bbda630b0b7ddfc5ea9ca157546dbbf4c613192f930 file1.txt
6dfbe55f4d2edc5fe5c9197bca51ceaaf824e48eba0cc453088aee24 file2.txt
.. versionchanged:: 4.3
Passing ``-`` reads from standard input.
.. option:: sha256sum <file>...
.. versionadded:: 3.10
Create SHA256 checksum of files in ``sha256sum`` compatible format::
76713b23615d31680afeb0e9efe94d47d3d4229191198bb46d7485f9cb191acc file1.txt
15b682ead6c12dedb1baf91231e1e89cfc7974b3787c1e2e01b986bffadae0ea file2.txt
.. versionchanged:: 4.3
Passing ``-`` reads from standard input.
.. option:: sha384sum <file>...
.. versionadded:: 3.10
Create SHA384 checksum of files in ``sha384sum`` compatible format::
acc049fedc091a22f5f2ce39a43b9057fd93c910e9afd76a6411a28a8f2b8a12c73d7129e292f94fc0329c309df49434 file1.txt
668ddeb108710d271ee21c0f3acbd6a7517e2b78f9181c6a2ff3b8943af92b0195dcb7cce48aa3e17893173c0a39e23d file2.txt
.. versionchanged:: 4.3
Passing ``-`` reads from standard input.
.. option:: sha512sum <file>...
.. versionadded:: 3.10
Create SHA512 checksum of files in ``sha512sum`` compatible format::
2a78d7a6c5328cfb1467c63beac8ff21794213901eaadafd48e7800289afbc08e5fb3e86aa31116c945ee3d7bf2a6194489ec6101051083d1108defc8e1dba89 file1.txt
7a0b54896fe5e70cca6dd643ad6f672614b189bf26f8153061c4d219474b05dad08c4e729af9f4b009f1a1a280cb625454bf587c690f4617c27e3aebdf3b7a2d file2.txt
.. versionchanged:: 4.3
Passing ``-`` reads from standard input.
.. option:: remove [-f] <file>...
.. deprecated:: 3.17
Remove the file(s). The planned behavior was that if any of the
listed files already do not exist, the command returns a non-zero exit code,
but no message is logged. The ``-f`` option changes the behavior to return a
zero exit code (i.e. success) in such situations instead.
``remove`` does not follow symlinks. That means it remove only symlinks
and not files it point to.
The implementation was buggy and always returned 0. It cannot be fixed without
breaking backwards compatibility. Use ``rm`` instead.
.. option:: remove_directory <dir>...
.. deprecated:: 3.17
Remove ``<dir>`` directories and their contents. If a directory does
not exist it will be silently ignored.
Use ``rm`` instead.
.. versionadded:: 3.15
Support for multiple directories.
.. versionadded:: 3.16
If ``<dir>`` is a symlink to a directory, just the symlink will be removed.
.. option:: rename <oldname> <newname>
Rename a file or directory (on one volume). If file with the ``<newname>`` name
already exists, then it will be silently replaced.
.. option:: rm [-rRf] [--] <file|dir>...
.. versionadded:: 3.17
Remove the files ``<file>`` or directories ``<dir>``.
Use ``-r`` or ``-R`` to remove directories and their contents recursively.
If any of the listed files/directories do not exist, the command returns a
non-zero exit code, but no message is logged. The ``-f`` option changes
the behavior to return a zero exit code (i.e. success) in such
situations instead. Use ``--`` to stop interpreting options and treat all
remaining arguments as paths, even if they start with ``-``.
.. option:: sleep <number>
.. versionadded:: 3.0
Sleep for ``<number>`` seconds. ``<number>`` may be a floating point number.
A practical minimum is about 0.1 seconds due to overhead in starting/stopping
CMake executable. This can be useful in a CMake script to insert a delay:
.. code-block:: cmake
# Sleep for about 0.5 seconds
execute_process(COMMAND ${CMAKE_COMMAND} -E sleep 0.5)
.. option:: tar [cxt][vf][zjJ] file.tar [<options>] [--] [<pathname>...]
Create or extract a tar or zip archive. Options are:
.. program:: cmake-E_tar
.. option:: c
Create a new archive containing the specified files.
If used, the ``<pathname>...`` argument is mandatory.
.. option:: x
Extract to disk from the archive.
.. versionadded:: 3.15
The ``<pathname>...`` argument could be used to extract only selected files
or directories.
When extracting selected files or directories, you must provide their exact
names including the path, as printed by list (``-t``).
.. versionchanged:: 4.3
Archive entries containing path traversal sequences (``..``), or
absolute paths, are rejected for security.
.. option:: t
List archive contents.
.. versionadded:: 3.15
The ``<pathname>...`` argument could be used to list only selected files
or directories.
.. option:: v
Produce verbose output.
.. option:: z
Compress the resulting archive with gzip (Deflate).
.. option:: j
Compress the resulting archive with bzip2.
.. option:: J
.. versionadded:: 3.1
Compress the resulting archive with XZ (LZMA2).
.. option:: --zstd
.. versionadded:: 3.15
Compress the resulting archive with Zstandard.
.. option:: --lzma
.. versionadded:: 4.3
Compress the resulting archive with LZMA algorithm.
.. option:: --files-from=<file>
.. versionadded:: 3.1
Read file names from the given file, one per line.
Blank lines are ignored. Lines may not start in ``-``
except for ``--add-file=<name>`` to add files whose
names start in ``-``.
.. option:: --format=<format>
.. versionadded:: 3.3
Specify the format of the archive to be created.
Supported formats are:
* ``7zip``
* ``gnutar``
* ``pax``
* ``paxr`` (restricted pax, default)
* ``raw``
.. versionadded:: 4.3
If this format is used, only one file will be compressed
with the compression type specified by the
:option:`--cmake-tar-compression-method <cmake-E_tar --cmake-tar-compression-method>`.
* ``zip``
If the compression method is not specified, the compression method
depends on the format:
* ``7zip`` uses ``LZMA`` compression
* ``zip`` uses ``Deflate`` compression
* others uses no compression by default
.. versionadded:: 4.3
The ``7zip`` and ``zip`` formats support changing the default compression
method and compression level.
.. option:: --mtime=<date>
.. versionadded:: 3.1
Specify modification time recorded in tarball entries.
.. option:: --cmake-tar-compression-method=<compression-method>
.. versionadded:: 4.3
The ``<compression-method>`` must be one of the following:
* ``none`` or ``store`` - no compression is used
* ``deflate`` or ``gzip`` - Deflate-based
* ``bzip2`` - BZip2-based
* ``lzma`` - LZMA-based
* ``lzma2`` or ``xz`` - LZMA2-based
* ``ppmd`` - PPMd-based
This compression method is only supported by the ``7zip`` archive format.
* ``zstd`` - Zstandard-based
This is the second variant for the compression method selection.
It provide more compression methods, that the classic ``tar``-like interface.
You can use any of them.
The default value depends on the :option:`--format <cmake-E_tar --format>`
option value and described in the corresponding section.
.. option:: --cmake-tar-compression-level=<compression-level>
.. versionadded:: 4.3
The ``<compression-level>`` should be between ``0`` and ``9``, with the
default being ``0``. The compression algorithm must be selected when
the ``--cmake-tar-compression-level`` option is given.
The ``<compression-level>`` of the ``Zstd`` algorithm can be set
between ``0`` and ``19``, except for the ``zip`` format.
The value ``0`` is used to specify the default compression level.
It is selected automatically by the archive library backend and
not directly set by CMake itself. The default compression level
may vary between archive formats, platforms, etc.
.. option:: --cmake-tar-encoding=<encoding>
.. versionadded:: 4.4
Specify the pathname character encoding used in the archive.
The ``<encoding>`` may be one of:
``UTF-8``
Archive pathnames are encoded as UTF-8.
This is the default since CMake 4.4.
``OEM``
On Windows platforms, pathnames are encoded as using the original
equipment manufacturer (OEM) code page. On non-Windows platforms,
pathnames are encoded according to the current locale.
In CMake 4.3 and below, the ``OEM`` encoding (current locale)
was always used.
``UTF-16LE``, ``UTF-16BE``
Archive pathnames are encoded as UTF-16 little-endian or big-endian.
``...``
Any encoding name supported by ``iconv`` on the current platform.
On Windows, code page names may be specified.
.. note::
``7zip`` archives always encode paths as ``UTF-16LE``,
so this option is silently ignored for that format.
.. option:: --cmake-tar-threads=<number>
.. versionadded:: 4.3
Use the ``<number>`` threads to operate on the archive. Currently only
multi-threaded compression is supported.
If set to ``0``, the number of available cores on the machine will be
used instead. Note that not all compression modes support threading
in all environments.
.. option:: --touch
.. versionadded:: 3.24
Use current local timestamp instead of extracting file timestamps
from the archive.
.. option:: --
.. versionadded:: 3.1
Stop interpreting options and treat all remaining arguments
as file names, even if they start with ``-``.
.. versionadded:: 3.1
LZMA (7zip) support.
.. versionadded:: 3.15
The command now continues adding files to an archive even if some of the
files are not readable. This behavior is more consistent with the classic
``tar`` tool. The command now also parses all flags, and if an invalid flag
was provided, a warning is issued.
.. program:: cmake-E
.. option:: time <command> [<args>...]
Run ``<command>`` and display elapsed time (including overhead of CMake frontend).
.. versionadded:: 3.5
The command now properly passes arguments with spaces or special characters
through to the child process. This may break scripts that worked around the
bug with their own extra quoting or escaping.
.. option:: touch <file>...
Creates ``<file>`` if file do not exist.
If ``<file>`` exists, it is changing ``<file>`` access and modification times.
.. option:: touch_nocreate <file>...
Touch a file if it exists but do not create it. If a file does
not exist it will be silently ignored.
.. option:: true
.. versionadded:: 3.16
Do nothing, with an exit code of 0.
Windows-specific Command-Line Tools
-----------------------------------
The following ``cmake -E`` commands are available only on Windows:
.. option:: delete_regv <key>
Delete Windows registry value.
.. option:: env_vs8_wince <sdkname>
.. versionadded:: 3.2
Displays a batch file which sets the environment for the provided
Windows CE SDK installed in VS2005.
.. option:: env_vs9_wince <sdkname>
.. versionadded:: 3.2
Displays a batch file which sets the environment for the provided
Windows CE SDK installed in VS2008.
.. option:: write_regv <key> <value>
Write Windows registry value.
.. _`Find-Package Tool Mode`:
Run the Find-Package Tool
=========================
.. program:: cmake--find-package
CMake provides a pkg-config like helper for Makefile-based projects:
.. code-block:: shell
cmake --find-package [<options>]
.. note::
This mode is not well-supported due to some technical limitations.
It is kept for compatibility but should not be used in new projects.
.. option:: --find-package
It searches a package using the :command:`find_package` command and prints the
resulting flags to stdout. This can be used instead of pkg-config to find
installed libraries in plain Makefile-based projects or in Autoconf-based
projects, using auxiliary macros installed in ``share/aclocal/cmake.m4`` on
the system.
When using this option, the following variables are expected:
``NAME``
Name of the package as called in ``find_package(<PackageName>)``.
``COMPILER_ID``
:variable:`Compiler ID <CMAKE_<LANG>_COMPILER_ID>` used for searching the
package, i.e. GNU/Intel/Clang/MSVC, etc.
``LANGUAGE``
Language used for searching the package, i.e. C/CXX/Fortran/ASM, etc.
``MODE``
The package search mode. Value can be one of:
``EXIST``
Only checks for existence of the given package.
``COMPILE``
Prints the flags needed for compiling an object file which uses the given
package.
``LINK``
Prints the flags needed for linking when using the given package.
``SILENT``
(Optional) If TRUE, find result message is not printed.
For example:
.. code-block:: shell
cmake --find-package -DNAME=CURL -DCOMPILER_ID=GNU -DLANGUAGE=C -DMODE=LINK
.. _`Workflow Mode`:
Run a Workflow Preset
=====================
.. versionadded:: 3.25
.. program:: cmake
:manual:`CMake Presets <cmake-presets(7)>` provides a way to execute multiple
build steps in order:
.. code-block:: shell
cmake --workflow <options>
The options are:
.. option:: --workflow
Select a :ref:`Workflow Preset` using one of the following options.
.. program:: cmake--workflow
.. option:: --preset <preset>, --preset=<preset>
Use a workflow :manual:`preset <cmake-presets(7)>` to specify a workflow.
The project binary directory is inferred from the initial configure preset.
.. versionchanged:: 3.31
When following immediately after the ``--workflow`` option,
the ``--preset`` argument can be omitted and just the ``<preset>``
name can be given. This means the following syntax is valid:
.. code-block:: console
$ cmake --workflow my-preset
.. versionchanged:: 4.4
If :cmake-workflow-option:`--presets-file` is specified, neither of
``CMakePresets.json`` nor ``CMakeUserPresets.json`` are required to be
present. Otherwise, they are required to be present in the top level
source directory. In prior versions, this was strictly required.
.. option:: --presets-file <file>, --presets-file=<file>
.. versionadded:: 4.4
Reads :manual:`presets <cmake-presets(7)>` from the given ``<file>``. The
specified path may be absolute or relative to the current working directory.
If ``--presets-file`` is given, presets defined in ``CMakePresets.json`` and
``CMakeUserPresets.json`` will be ignored.
.. option:: --list-presets
Lists the available workflow presets.
.. versionchanged:: 4.4
If :cmake-workflow-option:`--presets-file` is specified, neither of
``CMakePresets.json`` nor ``CMakeUserPresets.json`` are required to be
present, and only presets defined in the given ``<file>`` will be listed.
Otherwise, they are required to be present in the top level source
directory. In prior versions, this was strictly required.
.. option:: --fresh
Perform a fresh configuration of the build tree, which has the same effect
as :option:`cmake --fresh`.
View Help
=========
.. program:: cmake
To print selected pages from the CMake documentation, use
.. code-block:: shell
cmake --help[-<topic>]
with one of the following options:
.. include:: include/OPTIONS_HELP.rst
To view the presets available for a project, use
.. code-block:: shell
cmake <source-dir> --list-presets
.. _`CMake Exit Code`:
Return Value (Exit Code)
========================
Upon regular termination, the :program:`cmake` executable returns the exit code ``0``.
If termination is caused by the command :command:`message(FATAL_ERROR)`,
or another error condition, then a non-zero exit code is returned.
See Also
========
.. include:: include/LINKS.rst
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