150 lines
6.8 KiB
ReStructuredText
150 lines
6.8 KiB
ReStructuredText
target_link_libraries
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---------------------
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Link a target to given libraries.
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::
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target_link_libraries(<target> [item1 [item2 [...]]]
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[[debug|optimized|general] <item>] ...)
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Specify libraries or flags to use when linking a given target. The
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named ``<target>`` must have been created in the current directory by a
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command such as :command:`add_executable` or :command:`add_library`. The
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remaining arguments specify library names or flags. Repeated calls for
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the same ``<target>`` append items in the order called.
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If a library name matches that of another target in the project a
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dependency will automatically be added in the build system to make sure
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the library being linked is up-to-date before the target links. Item names
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starting with ``-``, but not ``-l`` or ``-framework``, are treated as
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linker flags.
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A ``debug``, ``optimized``, or ``general`` keyword indicates that the
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library immediately following it is to be used only for the
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corresponding build configuration. The ``debug`` keyword corresponds to
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the Debug configuration (or to configurations named in the
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:prop_gbl:`DEBUG_CONFIGURATIONS` global property if it is set). The
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``optimized`` keyword corresponds to all other configurations. The
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``general`` keyword corresponds to all configurations, and is purely
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optional (assumed if omitted). Higher granularity may be achieved for
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per-configuration rules by creating and linking to
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:ref:`IMPORTED library targets <Imported Targets>`.
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Library dependencies are transitive by default with this signature.
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When this target is linked into another target then the libraries
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linked to this target will appear on the link line for the other
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target too. This transitive "link interface" is stored in the
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:prop_tgt:`INTERFACE_LINK_LIBRARIES` target property and may be overridden
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by setting the property directly. When :policy:`CMP0022` is not set to
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``NEW``, transitive linking is built in but may be overridden by the
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:prop_tgt:`LINK_INTERFACE_LIBRARIES` property. Calls to other signatures
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of this command may set the property making any libraries linked
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exclusively by this signature private.
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CMake will also propagate :ref:`usage requirements <Target Usage Requirements>`
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from linked library targets. Usage requirements of dependencies affect
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compilation of sources in the ``<target>``.
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If an ``<item>`` is a library in a Mac OX framework, the ``Headers``
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directory of the framework will also be processed as a
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:ref:`usage requirement <Target Usage Requirements>`. This has the same
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effect as passing the framework directory as an include directory.
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--------------------------------------------------------------------------
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::
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target_link_libraries(<target>
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<PRIVATE|PUBLIC|INTERFACE> <lib> ...
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[<PRIVATE|PUBLIC|INTERFACE> <lib> ... ] ...])
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The ``PUBLIC``, ``PRIVATE`` and ``INTERFACE`` keywords can be used to
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specify both the link dependencies and the link interface in one command.
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Libraries and targets following ``PUBLIC`` are linked to, and are made
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part of the link interface. Libraries and targets following ``PRIVATE``
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are linked to, but are not made part of the link interface. Libraries
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following ``INTERFACE`` are appended to the link interface and are not
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used for linking ``<target>``.
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--------------------------------------------------------------------------
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::
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target_link_libraries(<target> LINK_INTERFACE_LIBRARIES
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[[debug|optimized|general] <lib>] ...)
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The ``LINK_INTERFACE_LIBRARIES`` mode appends the libraries to the
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:prop_tgt:`INTERFACE_LINK_LIBRARIES` target property instead of using them
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for linking. If policy :policy:`CMP0022` is not ``NEW``, then this mode
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also appends libraries to the :prop_tgt:`LINK_INTERFACE_LIBRARIES` and its
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per-configuration equivalent.
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This signature is for compatibility only. Prefer the ``INTERFACE`` mode
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instead.
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Libraries specified as ``debug`` are wrapped in a generator expression to
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correspond to debug builds. If policy :policy:`CMP0022` is
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not ``NEW``, the libraries are also appended to the
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:prop_tgt:`LINK_INTERFACE_LIBRARIES_DEBUG <LINK_INTERFACE_LIBRARIES_<CONFIG>>`
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property (or to the properties corresponding to configurations listed in
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the :prop_gbl:`DEBUG_CONFIGURATIONS` global property if it is set).
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Libraries specified as ``optimized`` are appended to the
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:prop_tgt:`INTERFACE_LINK_LIBRARIES` property. If policy :policy:`CMP0022`
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is not ``NEW``, they are also appended to the
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:prop_tgt:`LINK_INTERFACE_LIBRARIES` property. Libraries specified as
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``general`` (or without any keyword) are treated as if specified for both
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``debug`` and ``optimized``.
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--------------------------------------------------------------------------
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::
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target_link_libraries(<target>
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<LINK_PRIVATE|LINK_PUBLIC>
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[[debug|optimized|general] <lib>] ...
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[<LINK_PRIVATE|LINK_PUBLIC>
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[[debug|optimized|general] <lib>] ...])
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The ``LINK_PUBLIC`` and ``LINK_PRIVATE`` modes can be used to specify both
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the link dependencies and the link interface in one command.
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This signature is for compatibility only. Prefer the ``PUBLIC`` or
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``PRIVATE`` keywords instead.
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Libraries and targets following ``LINK_PUBLIC`` are linked to, and are
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made part of the :prop_tgt:`INTERFACE_LINK_LIBRARIES`. If policy
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:policy:`CMP0022` is not ``NEW``, they are also made part of the
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:prop_tgt:`LINK_INTERFACE_LIBRARIES`. Libraries and targets following
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``LINK_PRIVATE`` are linked to, but are not made part of the
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:prop_tgt:`INTERFACE_LINK_LIBRARIES` (or :prop_tgt:`LINK_INTERFACE_LIBRARIES`).
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The library dependency graph is normally acyclic (a DAG), but in the case
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of mutually-dependent ``STATIC`` libraries CMake allows the graph to
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contain cycles (strongly connected components). When another target links
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to one of the libraries, CMake repeats the entire connected component.
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For example, the code
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.. code-block:: cmake
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add_library(A STATIC a.c)
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add_library(B STATIC b.c)
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target_link_libraries(A B)
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target_link_libraries(B A)
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add_executable(main main.c)
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target_link_libraries(main A)
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links ``main`` to ``A B A B``. While one repetition is usually
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sufficient, pathological object file and symbol arrangements can require
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more. One may handle such cases by manually repeating the component in
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the last ``target_link_libraries`` call. However, if two archives are
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really so interdependent they should probably be combined into a single
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archive.
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Arguments to target_link_libraries may use "generator expressions"
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with the syntax ``$<...>``. Note however, that generator expressions
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will not be used in OLD handling of :policy:`CMP0003` or :policy:`CMP0004`.
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See the :manual:`cmake-generator-expressions(7)` manual for available
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expressions. See the :manual:`cmake-buildsystem(7)` manual for more on
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defining buildsystem properties.
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