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56 lines
2.4 KiB
56 lines
2.4 KiB
link_directories
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----------------
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Add directories in which the linker will look for libraries.
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.. code-block:: cmake
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link_directories([AFTER|BEFORE] directory1 [directory2 ...])
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Adds the paths in which the linker should search for libraries.
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Relative paths given to this command are interpreted as relative to
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the current source directory, see :policy:`CMP0015`.
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The command will apply only to targets created after it is called.
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.. versionadded:: 3.13
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The directories are added to the :prop_dir:`LINK_DIRECTORIES` directory
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property for the current ``CMakeLists.txt`` file, converting relative
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paths to absolute as needed. See the :manual:`cmake-buildsystem(7)`
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manual for more on defining buildsystem properties.
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.. versionadded:: 3.13
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By default the directories specified are appended onto the current list of
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directories. This default behavior can be changed by setting
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:variable:`CMAKE_LINK_DIRECTORIES_BEFORE` to ``ON``. By using
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``AFTER`` or ``BEFORE`` explicitly, you can select between appending and
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prepending, independent of the default.
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.. versionadded:: 3.13
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Arguments to ``link_directories`` may use "generator expressions" with
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the syntax "$<...>". See the :manual:`cmake-generator-expressions(7)`
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manual for available expressions.
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.. note::
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This command is rarely necessary and should be avoided where there are
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other choices. Prefer to pass full absolute paths to libraries where
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possible, since this ensures the correct library will always be linked.
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The :command:`find_library` command provides the full path, which can
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generally be used directly in calls to :command:`target_link_libraries`.
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Situations where a library search path may be needed include:
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- Project generators like Xcode where the user can switch target
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architecture at build time, but a full path to a library cannot
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be used because it only provides one architecture (i.e. it is not
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a universal binary).
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- Libraries may themselves have other private library dependencies
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that expect to be found via ``RPATH`` mechanisms, but some linkers
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are not able to fully decode those paths (e.g. due to the presence
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of things like ``$ORIGIN``).
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If a library search path must be provided, prefer to localize the effect
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where possible by using the :command:`target_link_directories` command
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rather than ``link_directories()``. The target-specific command can also
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control how the search directories propagate to other dependent targets.
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