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363 lines
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ReStructuredText
363 lines
15 KiB
ReStructuredText
find_package
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------------
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Load settings for an external project.
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::
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find_package(<package> [version] [EXACT] [QUIET] [MODULE]
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[REQUIRED] [[COMPONENTS] [components...]]
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[OPTIONAL_COMPONENTS components...]
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[NO_POLICY_SCOPE])
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Finds and loads settings from an external project. <package>_FOUND
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will be set to indicate whether the package was found. When the
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package is found package-specific information is provided through
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variables and imported targets documented by the package itself. The
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QUIET option disables messages if the package cannot be found. The
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MODULE option disables the second signature documented below. The
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REQUIRED option stops processing with an error message if the package
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cannot be found.
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A package-specific list of required components may be listed after the
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COMPONENTS option (or after the REQUIRED option if present).
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Additional optional components may be listed after
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OPTIONAL_COMPONENTS. Available components and their influence on
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whether a package is considered to be found are defined by the target
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package.
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The [version] argument requests a version with which the package found
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should be compatible (format is major[.minor[.patch[.tweak]]]). The
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EXACT option requests that the version be matched exactly. If no
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[version] and/or component list is given to a recursive invocation
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inside a find-module, the corresponding arguments are forwarded
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automatically from the outer call (including the EXACT flag for
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[version]). Version support is currently provided only on a
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package-by-package basis (details below).
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User code should generally look for packages using the above simple
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signature. The remainder of this command documentation specifies the
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full command signature and details of the search process. Project
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maintainers wishing to provide a package to be found by this command
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are encouraged to read on.
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The command has two modes by which it searches for packages: "Module"
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mode and "Config" mode. Module mode is available when the command is
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invoked with the above reduced signature. CMake searches for a file
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called "Find<package>.cmake" in the CMAKE_MODULE_PATH followed by the
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CMake installation. If the file is found, it is read and processed by
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CMake. It is responsible for finding the package, checking the
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version, and producing any needed messages. Many find-modules provide
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limited or no support for versioning; check the module documentation.
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If no module is found and the MODULE option is not given the command
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proceeds to Config mode.
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The complete Config mode command signature is:
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::
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find_package(<package> [version] [EXACT] [QUIET]
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[REQUIRED] [[COMPONENTS] [components...]]
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[CONFIG|NO_MODULE]
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[NO_POLICY_SCOPE]
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[NAMES name1 [name2 ...]]
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[CONFIGS config1 [config2 ...]]
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[HINTS path1 [path2 ... ]]
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[PATHS path1 [path2 ... ]]
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[PATH_SUFFIXES suffix1 [suffix2 ...]]
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[NO_DEFAULT_PATH]
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[NO_CMAKE_ENVIRONMENT_PATH]
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[NO_CMAKE_PATH]
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[NO_SYSTEM_ENVIRONMENT_PATH]
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[NO_CMAKE_PACKAGE_REGISTRY]
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[NO_CMAKE_BUILDS_PATH]
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[NO_CMAKE_SYSTEM_PATH]
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[NO_CMAKE_SYSTEM_PACKAGE_REGISTRY]
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[CMAKE_FIND_ROOT_PATH_BOTH |
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ONLY_CMAKE_FIND_ROOT_PATH |
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NO_CMAKE_FIND_ROOT_PATH])
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The CONFIG option may be used to skip Module mode explicitly and
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switch to Config mode. It is synonymous to using NO_MODULE. Config
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mode is also implied by use of options not specified in the reduced
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signature.
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Config mode attempts to locate a configuration file provided by the
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package to be found. A cache entry called <package>_DIR is created to
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hold the directory containing the file. By default the command
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searches for a package with the name <package>. If the NAMES option
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is given the names following it are used instead of <package>. The
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command searches for a file called "<name>Config.cmake" or
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"<lower-case-name>-config.cmake" for each name specified. A
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replacement set of possible configuration file names may be given
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using the CONFIGS option. The search procedure is specified below.
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Once found, the configuration file is read and processed by CMake.
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Since the file is provided by the package it already knows the
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location of package contents. The full path to the configuration file
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is stored in the cmake variable <package>_CONFIG.
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All configuration files which have been considered by CMake while
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searching for an installation of the package with an appropriate
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version are stored in the cmake variable <package>_CONSIDERED_CONFIGS,
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the associated versions in <package>_CONSIDERED_VERSIONS.
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If the package configuration file cannot be found CMake will generate
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an error describing the problem unless the QUIET argument is
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specified. If REQUIRED is specified and the package is not found a
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fatal error is generated and the configure step stops executing. If
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<package>_DIR has been set to a directory not containing a
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configuration file CMake will ignore it and search from scratch.
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When the [version] argument is given Config mode will only find a
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version of the package that claims compatibility with the requested
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version (format is major[.minor[.patch[.tweak]]]). If the EXACT
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option is given only a version of the package claiming an exact match
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of the requested version may be found. CMake does not establish any
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convention for the meaning of version numbers. Package version
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numbers are checked by "version" files provided by the packages
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themselves. For a candidate package configuration file
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"<config-file>.cmake" the corresponding version file is located next
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to it and named either "<config-file>-version.cmake" or
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"<config-file>Version.cmake". If no such version file is available
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then the configuration file is assumed to not be compatible with any
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requested version. A basic version file containing generic version
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matching code can be created using the macro
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write_basic_package_version_file(), see its documentation for more
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details. When a version file is found it is loaded to check the
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requested version number. The version file is loaded in a nested
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scope in which the following variables have been defined:
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::
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PACKAGE_FIND_NAME = the <package> name
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PACKAGE_FIND_VERSION = full requested version string
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PACKAGE_FIND_VERSION_MAJOR = major version if requested, else 0
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PACKAGE_FIND_VERSION_MINOR = minor version if requested, else 0
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PACKAGE_FIND_VERSION_PATCH = patch version if requested, else 0
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PACKAGE_FIND_VERSION_TWEAK = tweak version if requested, else 0
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PACKAGE_FIND_VERSION_COUNT = number of version components, 0 to 4
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The version file checks whether it satisfies the requested version and
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sets these variables:
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::
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PACKAGE_VERSION = full provided version string
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PACKAGE_VERSION_EXACT = true if version is exact match
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PACKAGE_VERSION_COMPATIBLE = true if version is compatible
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PACKAGE_VERSION_UNSUITABLE = true if unsuitable as any version
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These variables are checked by the find_package command to determine
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whether the configuration file provides an acceptable version. They
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are not available after the find_package call returns. If the version
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is acceptable the following variables are set:
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::
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<package>_VERSION = full provided version string
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<package>_VERSION_MAJOR = major version if provided, else 0
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<package>_VERSION_MINOR = minor version if provided, else 0
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<package>_VERSION_PATCH = patch version if provided, else 0
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<package>_VERSION_TWEAK = tweak version if provided, else 0
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<package>_VERSION_COUNT = number of version components, 0 to 4
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and the corresponding package configuration file is loaded. When
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multiple package configuration files are available whose version files
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claim compatibility with the version requested it is unspecified which
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one is chosen. No attempt is made to choose a highest or closest
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version number.
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Config mode provides an elaborate interface and search procedure.
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Much of the interface is provided for completeness and for use
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internally by find-modules loaded by Module mode. Most user code
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should simply call
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::
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find_package(<package> [major[.minor]] [EXACT] [REQUIRED|QUIET])
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in order to find a package. Package maintainers providing CMake
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package configuration files are encouraged to name and install them
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such that the procedure outlined below will find them without
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requiring use of additional options.
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CMake constructs a set of possible installation prefixes for the
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package. Under each prefix several directories are searched for a
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configuration file. The tables below show the directories searched.
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Each entry is meant for installation trees following Windows (W), UNIX
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(U), or Apple (A) conventions.
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::
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<prefix>/ (W)
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<prefix>/(cmake|CMake)/ (W)
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<prefix>/<name>*/ (W)
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<prefix>/<name>*/(cmake|CMake)/ (W)
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<prefix>/(lib/<arch>|lib|share)/cmake/<name>*/ (U)
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<prefix>/(lib/<arch>|lib|share)/<name>*/ (U)
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<prefix>/(lib/<arch>|lib|share)/<name>*/(cmake|CMake)/ (U)
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On systems supporting OS X Frameworks and Application Bundles the
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following directories are searched for frameworks or bundles
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containing a configuration file:
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::
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<prefix>/<name>.framework/Resources/ (A)
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<prefix>/<name>.framework/Resources/CMake/ (A)
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<prefix>/<name>.framework/Versions/*/Resources/ (A)
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<prefix>/<name>.framework/Versions/*/Resources/CMake/ (A)
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<prefix>/<name>.app/Contents/Resources/ (A)
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<prefix>/<name>.app/Contents/Resources/CMake/ (A)
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In all cases the <name> is treated as case-insensitive and corresponds
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to any of the names specified (<package> or names given by NAMES).
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Paths with lib/<arch> are enabled if CMAKE_LIBRARY_ARCHITECTURE is
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set. If PATH_SUFFIXES is specified the suffixes are appended to each
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(W) or (U) directory entry one-by-one.
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This set of directories is intended to work in cooperation with
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projects that provide configuration files in their installation trees.
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Directories above marked with (W) are intended for installations on
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Windows where the prefix may point at the top of an application's
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installation directory. Those marked with (U) are intended for
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installations on UNIX platforms where the prefix is shared by multiple
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packages. This is merely a convention, so all (W) and (U) directories
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are still searched on all platforms. Directories marked with (A) are
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intended for installations on Apple platforms. The cmake variables
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CMAKE_FIND_FRAMEWORK and CMAKE_FIND_APPBUNDLE determine the order of
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preference as specified below.
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The set of installation prefixes is constructed using the following
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steps. If NO_DEFAULT_PATH is specified all NO_* options are enabled.
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1. Search paths specified in cmake-specific cache variables. These
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are intended to be used on the command line with a -DVAR=value. This
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can be skipped if NO_CMAKE_PATH is passed.
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::
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CMAKE_PREFIX_PATH
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CMAKE_FRAMEWORK_PATH
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CMAKE_APPBUNDLE_PATH
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2. Search paths specified in cmake-specific environment variables.
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These are intended to be set in the user's shell configuration. This
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can be skipped if NO_CMAKE_ENVIRONMENT_PATH is passed.
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::
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<package>_DIR
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CMAKE_PREFIX_PATH
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CMAKE_FRAMEWORK_PATH
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CMAKE_APPBUNDLE_PATH
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3. Search paths specified by the HINTS option. These should be paths
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computed by system introspection, such as a hint provided by the
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location of another item already found. Hard-coded guesses should be
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specified with the PATHS option.
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4. Search the standard system environment variables. This can be
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skipped if NO_SYSTEM_ENVIRONMENT_PATH is passed. Path entries ending
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in "/bin" or "/sbin" are automatically converted to their parent
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directories.
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::
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PATH
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5. Search project build trees recently configured in a CMake GUI.
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This can be skipped if NO_CMAKE_BUILDS_PATH is passed. It is intended
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for the case when a user is building multiple dependent projects one
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after another.
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6. Search paths stored in the CMake user package registry. This can
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be skipped if NO_CMAKE_PACKAGE_REGISTRY is passed. On Windows a
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<package> may appear under registry key
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::
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HKEY_CURRENT_USER\Software\Kitware\CMake\Packages\<package>
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as a REG_SZ value, with arbitrary name, that specifies the directory
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containing the package configuration file. On UNIX platforms a
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<package> may appear under the directory
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::
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~/.cmake/packages/<package>
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as a file, with arbitrary name, whose content specifies the directory
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containing the package configuration file. See the export(PACKAGE)
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command to create user package registry entries for project build
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trees.
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7. Search cmake variables defined in the Platform files for the
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current system. This can be skipped if NO_CMAKE_SYSTEM_PATH is
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passed.
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::
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CMAKE_SYSTEM_PREFIX_PATH
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CMAKE_SYSTEM_FRAMEWORK_PATH
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CMAKE_SYSTEM_APPBUNDLE_PATH
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8. Search paths stored in the CMake system package registry. This
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can be skipped if NO_CMAKE_SYSTEM_PACKAGE_REGISTRY is passed. On
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Windows a <package> may appear under registry key
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::
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HKEY_LOCAL_MACHINE\Software\Kitware\CMake\Packages\<package>
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as a REG_SZ value, with arbitrary name, that specifies the directory
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containing the package configuration file. There is no system package
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registry on non-Windows platforms.
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9. Search paths specified by the PATHS option. These are typically
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hard-coded guesses.
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.. |FIND_XXX| replace:: find_package
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.. |FIND_ARGS_XXX| replace:: <package>
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.. |CMAKE_FIND_ROOT_PATH_MODE_XXX| replace::
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CMAKE_FIND_ROOT_PATH_MODE_PACKAGE
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.. include:: FIND_XXX_MAC.txt
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.. include:: FIND_XXX_ROOT.txt
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.. include:: FIND_XXX_ORDER.txt
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Every non-REQUIRED find_package() call can be disabled by setting the
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variable CMAKE_DISABLE_FIND_PACKAGE_<package> to TRUE. See the
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documentation for the CMAKE_DISABLE_FIND_PACKAGE_<package> variable
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for more information.
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When loading a find module or package configuration file find_package
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defines variables to provide information about the call arguments (and
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restores their original state before returning):
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::
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<package>_FIND_REQUIRED = true if REQUIRED option was given
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<package>_FIND_QUIETLY = true if QUIET option was given
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<package>_FIND_VERSION = full requested version string
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<package>_FIND_VERSION_MAJOR = major version if requested, else 0
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<package>_FIND_VERSION_MINOR = minor version if requested, else 0
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<package>_FIND_VERSION_PATCH = patch version if requested, else 0
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<package>_FIND_VERSION_TWEAK = tweak version if requested, else 0
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<package>_FIND_VERSION_COUNT = number of version components, 0 to 4
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<package>_FIND_VERSION_EXACT = true if EXACT option was given
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<package>_FIND_COMPONENTS = list of requested components
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<package>_FIND_REQUIRED_<c> = true if component <c> is required
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false if component <c> is optional
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In Module mode the loaded find module is responsible to honor the
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request detailed by these variables; see the find module for details.
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In Config mode find_package handles REQUIRED, QUIET, and version
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options automatically but leaves it to the package configuration file
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to handle components in a way that makes sense for the package. The
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package configuration file may set <package>_FOUND to false to tell
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find_package that component requirements are not satisfied.
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See the cmake_policy() command documentation for discussion of the
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NO_POLICY_SCOPE option.
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