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-.. cmake-manual-description: CMake Generator Expressions
-
-cmake-generator-expressions(7)
-******************************
-
-.. only:: html
-
- .. contents::
-
-Introduction
-============
-
-Generator expressions are evaluated during build system generation to produce
-information specific to each build configuration.
-
-Generator expressions are allowed in the context of many target properties,
-such as :prop_tgt:`LINK_LIBRARIES`, :prop_tgt:`INCLUDE_DIRECTORIES`,
-:prop_tgt:`COMPILE_DEFINITIONS` and others. They may also be used when using
-commands to populate those properties, such as :command:`target_link_libraries`,
-:command:`target_include_directories`, :command:`target_compile_definitions`
-and others.
-
-This means that they enable conditional linking, conditional
-definitions used when compiling, and conditional include directories and
-more. The conditions may be based on the build configuration, target
-properties, platform information or any other queryable information.
-
-Logical Expressions
-===================
-
-Logical expressions are used to create conditional output. The basic
-expressions are the ``0`` and ``1`` expressions. Because other logical
-expressions evaluate to either ``0`` or ``1``, they can be composed to
-create conditional output::
-
- $<$<CONFIG:Debug>:DEBUG_MODE>
-
-expands to ``DEBUG_MODE`` when the ``Debug`` configuration is used, and
-otherwise expands to nothing.
-
-Available logical expressions are:
-
-``$<0:...>``
- Empty string (ignores ``...``)
-``$<1:...>``
- Content of ``...``
-``$<BOOL:...>``
- ``1`` if the ``...`` is true, else ``0``
-``$<AND:?[,?]...>``
- ``1`` if all ``?`` are ``1``, else ``0``
-
- The ``?`` must always be either ``0`` or ``1`` in boolean expressions.
-
-``$<OR:?[,?]...>``
- ``0`` if all ``?`` are ``0``, else ``1``
-``$<NOT:?>``
- ``0`` if ``?`` is ``1``, else ``1``
-``$<STREQUAL:a,b>``
- ``1`` if ``a`` is STREQUAL ``b``, else ``0``
-``$<EQUAL:a,b>``
- ``1`` if ``a`` is EQUAL ``b`` in a numeric comparison, else ``0``
-``$<CONFIG:cfg>``
- ``1`` if config is ``cfg``, else ``0``. This is a case-insensitive comparison.
- The mapping in :prop_tgt:`MAP_IMPORTED_CONFIG_<CONFIG>` is also considered by
- this expression when it is evaluated on a property on an :prop_tgt:`IMPORTED`
- target.
-``$<PLATFORM_ID:comp>``
- ``1`` if the CMake-id of the platform matches ``comp``, otherwise ``0``.
-``$<C_COMPILER_ID:comp>``
- ``1`` if the CMake-id of the C compiler matches ``comp``, otherwise ``0``.
-``$<CXX_COMPILER_ID:comp>``
- ``1`` if the CMake-id of the CXX compiler matches ``comp``, otherwise ``0``.
-``$<VERSION_GREATER:v1,v2>``
- ``1`` if ``v1`` is a version greater than ``v2``, else ``0``.
-``$<VERSION_LESS:v1,v2>``
- ``1`` if ``v1`` is a version less than ``v2``, else ``0``.
-``$<VERSION_EQUAL:v1,v2>``
- ``1`` if ``v1`` is the same version as ``v2``, else ``0``.
-``$<C_COMPILER_VERSION:ver>``
- ``1`` if the version of the C compiler matches ``ver``, otherwise ``0``.
-``$<CXX_COMPILER_VERSION:ver>``
- ``1`` if the version of the CXX compiler matches ``ver``, otherwise ``0``.
-``$<TARGET_POLICY:pol>``
- ``1`` if the policy ``pol`` was NEW when the 'head' target was created,
- else ``0``. If the policy was not set, the warning message for the policy
- will be emitted. This generator expression only works for a subset of
- policies.
-``$<COMPILE_FEATURES:feature[,feature]...>``
- ``1`` if all of the ``feature`` features are available for the 'head'
- target, and ``0`` otherwise. If this expression is used while evaluating
- the link implementation of a target and if any dependency transitively
- increases the required :prop_tgt:`C_STANDARD` or :prop_tgt:`CXX_STANDARD`
- for the 'head' target, an error is reported. See the
- :manual:`cmake-compile-features(7)` manual for information on
- compile features.
-
-Informational Expressions
-=========================
-
-These expressions expand to some information. The information may be used
-directly, eg::
-
- include_directories(/usr/include/$<CXX_COMPILER_ID>/)
-
-expands to ``/usr/include/GNU/`` or ``/usr/include/Clang/`` etc, depending on
-the Id of the compiler.
-
-These expressions may also may be combined with logical expressions::
-
- $<$<VERSION_LESS:$<CXX_COMPILER_VERSION>,4.2.0>:OLD_COMPILER>
-
-expands to ``OLD_COMPILER`` if the
-:variable:`CMAKE_CXX_COMPILER_VERSION <CMAKE_<LANG>_COMPILER_VERSION>` is less
-than 4.2.0.
-
-Available informational expressions are:
-
-``$<CONFIGURATION>``
- Configuration name. Deprecated. Use ``CONFIG`` instead.
-``$<CONFIG>``
- Configuration name
-``$<PLATFORM_ID>``
- The CMake-id of the platform.
- See also the :variable:`CMAKE_SYSTEM_NAME` variable.
-``$<C_COMPILER_ID>``
- The CMake-id of the C compiler used.
- See also the :variable:`CMAKE_<LANG>_COMPILER_ID` variable.
-``$<CXX_COMPILER_ID>``
- The CMake-id of the CXX compiler used.
- See also the :variable:`CMAKE_<LANG>_COMPILER_ID` variable.
-``$<C_COMPILER_VERSION>``
- The version of the C compiler used.
- See also the :variable:`CMAKE_<LANG>_COMPILER_VERSION` variable.
-``$<CXX_COMPILER_VERSION>``
- The version of the CXX compiler used.
- See also the :variable:`CMAKE_<LANG>_COMPILER_VERSION` variable.
-``$<TARGET_FILE:tgt>``
- Full path to main file (.exe, .so.1.2, .a) where ``tgt`` is the name of a target.
-``$<TARGET_FILE_NAME:tgt>``
- Name of main file (.exe, .so.1.2, .a).
-``$<TARGET_FILE_DIR:tgt>``
- Directory of main file (.exe, .so.1.2, .a).
-``$<TARGET_LINKER_FILE:tgt>``
- File used to link (.a, .lib, .so) where ``tgt`` is the name of a target.
-``$<TARGET_LINKER_FILE_NAME:tgt>``
- Name of file used to link (.a, .lib, .so).
-``$<TARGET_LINKER_FILE_DIR:tgt>``
- Directory of file used to link (.a, .lib, .so).
-``$<TARGET_SONAME_FILE:tgt>``
- File with soname (.so.3) where ``tgt`` is the name of a target.
-``$<TARGET_SONAME_FILE_NAME:tgt>``
- Name of file with soname (.so.3).
-``$<TARGET_SONAME_FILE_DIR:tgt>``
- Directory of with soname (.so.3).
-``$<TARGET_PDB_FILE:tgt>``
- Full path to the linker generated program database file (.pdb)
- where ``tgt`` is the name of a target.
-
- See also the :prop_tgt:`PDB_NAME` and :prop_tgt:`PDB_OUTPUT_DIRECTORY`
- target properties and their configuration specific variants
- :prop_tgt:`PDB_NAME_<CONFIG>` and :prop_tgt:`PDB_OUTPUT_DIRECTORY_<CONFIG>`.
-``$<TARGET_PDB_FILE_NAME:tgt>``
- Name of the linker generated program database file (.pdb).
-``$<TARGET_PDB_FILE_DIR:tgt>``
- Directory of the linker generated program database file (.pdb).
-``$<TARGET_PROPERTY:tgt,prop>``
- Value of the property ``prop`` on the target ``tgt``.
-
- Note that ``tgt`` is not added as a dependency of the target this
- expression is evaluated on.
-``$<TARGET_PROPERTY:prop>``
- Value of the property ``prop`` on the target on which the generator
- expression is evaluated.
-``$<INSTALL_PREFIX>``
- Content of the install prefix when the target is exported via
- :command:`install(EXPORT)` and empty otherwise.
-
-Output Expressions
-==================
-
-These expressions generate output, in some cases depending on an input. These
-expressions may be combined with other expressions for information or logical
-comparison::
-
- -I$<JOIN:$<TARGET_PROPERTY:INCLUDE_DIRECTORIES>, -I>
-
-generates a string of the entries in the :prop_tgt:`INCLUDE_DIRECTORIES` target
-property with each entry preceeded by ``-I``. Note that a more-complete use
-in this situation would require first checking if the INCLUDE_DIRECTORIES
-property is non-empty::
-
- $<$<BOOL:${prop}>:-I$<JOIN:${prop}, -I>>
-
-where ``${prop}`` refers to a helper variable::
-
- set(prop "$<TARGET_PROPERTY:INCLUDE_DIRECTORIES>")
-
-Available output expressions are:
-
-``$<JOIN:list,...>``
- Joins the list with the content of ``...``
-``$<ANGLE-R>``
- A literal ``>``. Used to compare strings which contain a ``>`` for example.
-``$<COMMA>``
- A literal ``,``. Used to compare strings which contain a ``,`` for example.
-``$<SEMICOLON>``
- A literal ``;``. Used to prevent list expansion on an argument with ``;``.
-``$<TARGET_NAME:...>``
- Marks ``...`` as being the name of a target. This is required if exporting
- targets to multiple dependent export sets. The ``...`` must be a literal
- name of a target- it may not contain generator expressions.
-``$<LINK_ONLY:...>``
- Content of ``...`` except when evaluated in a link interface while
- propagating :ref:`Target Usage Requirements`, in which case it is the
- empty string.
- Intended for use only in an :prop_tgt:`INTERFACE_LINK_LIBRARIES` target
- property, perhaps via the :command:`target_link_libraries` command,
- to specify private link dependencies without other usage requirements.
-``$<INSTALL_INTERFACE:...>``
- Content of ``...`` when the property is exported using :command:`install(EXPORT)`,
- and empty otherwise.
-``$<BUILD_INTERFACE:...>``
- Content of ``...`` when the property is exported using :command:`export`, or
- when the target is used by another target in the same buildsystem. Expands to
- the empty string otherwise.
-``$<LOWER_CASE:...>``
- Content of ``...`` converted to lower case.
-``$<UPPER_CASE:...>``
- Content of ``...`` converted to upper case.
-``$<MAKE_C_IDENTIFIER:...>``
- Content of ``...`` converted to a C identifier.
-``$<TARGET_OBJECTS:objLib>``
- List of objects resulting from build of ``objLib``. ``objLib`` must be an
- object of type ``OBJECT_LIBRARY``. This expression may only be used in
- the sources of :command:`add_library` and :command:`add_executable`
- commands.