A short-hand signature is: .. parsed-literal:: |FIND_XXX| ( name1 [path1 path2 ...]) The general signature is: .. parsed-literal:: |FIND_XXX| ( name | |NAMES| [HINTS [path | ENV var]... ] [PATHS [path | ENV var]... ] [REGISTRY_VIEW (64|32|64_32|32_64|HOST|TARGET|BOTH)] [PATH_SUFFIXES suffix1 [suffix2 ...]] [VALIDATOR function] [DOC "cache documentation string"] [NO_CACHE] [REQUIRED] [NO_DEFAULT_PATH] [NO_PACKAGE_ROOT_PATH] [NO_CMAKE_PATH] [NO_CMAKE_ENVIRONMENT_PATH] [NO_SYSTEM_ENVIRONMENT_PATH] [NO_CMAKE_SYSTEM_PATH] [NO_CMAKE_INSTALL_PREFIX] [CMAKE_FIND_ROOT_PATH_BOTH | ONLY_CMAKE_FIND_ROOT_PATH | NO_CMAKE_FIND_ROOT_PATH] ) This command is used to find a |SEARCH_XXX_DESC|. A cache entry, or a normal variable if ``NO_CACHE`` is specified, named by ```` is created to store the result of this command. If the |SEARCH_XXX| is found the result is stored in the variable and the search will not be repeated unless the variable is cleared. If nothing is found, the result will be ``-NOTFOUND``. Options include: ``NAMES`` Specify one or more possible names for the |SEARCH_XXX|. When using this to specify names with and without a version suffix, we recommend specifying the unversioned name first so that locally-built packages can be found before those provided by distributions. ``HINTS``, ``PATHS`` Specify directories to search in addition to the default locations. The ``ENV var`` sub-option reads paths from a system environment variable. .. versionchanged:: 3.24 On ``Windows`` platform, it is possible to include registry queries as part of the directories, using a :ref:`dedicated syntax `. Such specifications will be ignored on all other platforms. ``REGISTRY_VIEW`` .. versionadded:: 3.24 .. include:: FIND_XXX_REGISTRY_VIEW.txt ``PATH_SUFFIXES`` Specify additional subdirectories to check below each directory location otherwise considered. ``VALIDATOR`` .. versionadded:: 3.25 Specify a :command:`function` to be called for each candidate item found (a :command:`macro` cannot be provided, that will result in an error). Two arguments will be passed to the validator function: the name of a result variable, and the absolute path to the candidate item. The item will be accepted and the search will end unless the function sets the value in the result variable to false in the calling scope. The result variable will hold a true value when the validator function is entered. .. parsed-literal:: function(my_check validator_result_var item) if(NOT item MATCHES ...) set(${validator_result_var} FALSE PARENT_SCOPE) endif() endfunction() |FIND_XXX| (result NAMES ... VALIDATOR my_check) Note that if a cached result is used, the search is skipped and any ``VALIDATOR`` is ignored. The cached result is not required to pass the validation function. ``DOC`` Specify the documentation string for the ```` cache entry. ``NO_CACHE`` .. versionadded:: 3.21 The result of the search will be stored in a normal variable rather than a cache entry. .. note:: If the variable is already set before the call (as a normal or cache variable) then the search will not occur. .. warning:: This option should be used with caution because it can greatly increase the cost of repeated configure steps. ``REQUIRED`` .. versionadded:: 3.18 Stop processing with an error message if nothing is found, otherwise the search will be attempted again the next time |FIND_XXX| is invoked with the same variable. If ``NO_DEFAULT_PATH`` is specified, then no additional paths are added to the search. If ``NO_DEFAULT_PATH`` is not specified, the search process is as follows: .. |FIND_PACKAGE_ROOT_PREFIX_PATH_XXX_SUBDIR| replace:: |prefix_XXX_SUBDIR| for each ```` in the :variable:`_ROOT` CMake variable and the :envvar:`_ROOT` environment variable if called from within a find module loaded by :command:`find_package()` .. |CMAKE_PREFIX_PATH_XXX_SUBDIR| replace:: |prefix_XXX_SUBDIR| for each ```` in :variable:`CMAKE_PREFIX_PATH` .. |SYSTEM_ENVIRONMENT_PREFIX_PATH_XXX_SUBDIR| replace:: |prefix_XXX_SUBDIR| for each ``/[s]bin`` in ``PATH``, and |entry_XXX_SUBDIR| for other entries in ``PATH`` .. |CMAKE_SYSTEM_PREFIX_PATH_XXX_SUBDIR| replace:: |prefix_XXX_SUBDIR| for each ```` in :variable:`CMAKE_SYSTEM_PREFIX_PATH` 1. .. versionadded:: 3.12 If called from within a find module or any other script loaded by a call to :command:`find_package()`, search prefixes unique to the current package being found. Specifically, look in the :variable:`_ROOT` CMake variable and the :envvar:`_ROOT` environment variable. The package root variables are maintained as a stack, so if called from nested find modules or config packages, root paths from the parent's find module or config package will be searched after paths from the current module or package. In other words, the search order would be ``_ROOT``, ``ENV{_ROOT}``, ``_ROOT``, ``ENV{_ROOT}``, etc. This can be skipped if ``NO_PACKAGE_ROOT_PATH`` is passed or by setting the :variable:`CMAKE_FIND_USE_PACKAGE_ROOT_PATH` to ``FALSE``. See policy :policy:`CMP0074`. * |FIND_PACKAGE_ROOT_PREFIX_PATH_XXX| 2. Search paths specified in cmake-specific cache variables. These are intended to be used on the command line with a ``-DVAR=value``. The values are interpreted as :ref:`semicolon-separated lists `. This can be skipped if ``NO_CMAKE_PATH`` is passed or by setting the :variable:`CMAKE_FIND_USE_CMAKE_PATH` to ``FALSE``. * |CMAKE_PREFIX_PATH_XXX| * |CMAKE_XXX_PATH| * |CMAKE_XXX_MAC_PATH| 3. Search paths specified in cmake-specific environment variables. These are intended to be set in the user's shell configuration, and therefore use the host's native path separator (``;`` on Windows and ``:`` on UNIX). This can be skipped if ``NO_CMAKE_ENVIRONMENT_PATH`` is passed or by setting the :variable:`CMAKE_FIND_USE_CMAKE_ENVIRONMENT_PATH` to ``FALSE``. * |CMAKE_PREFIX_PATH_XXX| * |CMAKE_XXX_PATH| * |CMAKE_XXX_MAC_PATH| 4. Search the paths specified by the ``HINTS`` option. These should be paths computed by system introspection, such as a hint provided by the location of another item already found. Hard-coded guesses should be specified with the ``PATHS`` option. 5. Search the standard system environment variables. This can be skipped if ``NO_SYSTEM_ENVIRONMENT_PATH`` is passed or by setting the :variable:`CMAKE_FIND_USE_SYSTEM_ENVIRONMENT_PATH` to ``FALSE``. * |SYSTEM_ENVIRONMENT_PATH_XXX| * |SYSTEM_ENVIRONMENT_PATH_WINDOWS_XXX| 6. Search cmake variables defined in the Platform files for the current system. The searching of ``CMAKE_INSTALL_PREFIX`` and ``CMAKE_STAGING_PREFIX`` can be skipped if ``NO_CMAKE_INSTALL_PREFIX`` is passed or by setting the :variable:`CMAKE_FIND_USE_INSTALL_PREFIX` to ``FALSE``. All these locations can be skipped if ``NO_CMAKE_SYSTEM_PATH`` is passed or by setting the :variable:`CMAKE_FIND_USE_CMAKE_SYSTEM_PATH` to ``FALSE``. * |CMAKE_SYSTEM_PREFIX_PATH_XXX| * |CMAKE_SYSTEM_XXX_PATH| * |CMAKE_SYSTEM_XXX_MAC_PATH| The platform paths that these variables contain are locations that typically include installed software. An example being ``/usr/local`` for UNIX based platforms. 7. Search the paths specified by the PATHS option or in the short-hand version of the command. These are typically hard-coded guesses. The :variable:`CMAKE_IGNORE_PATH`, :variable:`CMAKE_IGNORE_PREFIX_PATH`, :variable:`CMAKE_SYSTEM_IGNORE_PATH` and :variable:`CMAKE_SYSTEM_IGNORE_PREFIX_PATH` variables can also cause some of the above locations to be ignored. .. versionadded:: 3.16 Added ``CMAKE_FIND_USE__PATH`` variables to globally disable various search locations. .. |FIND_ARGS_XXX| replace:: NAMES name On macOS the :variable:`CMAKE_FIND_FRAMEWORK` and :variable:`CMAKE_FIND_APPBUNDLE` variables determine the order of preference between Apple-style and unix-style package components. .. include:: FIND_XXX_ROOT.txt .. include:: FIND_XXX_ORDER.txt