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55 lines
2.1 KiB
55 lines
2.1 KiB
3 years ago
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LINK_LIBRARIES_ONLY_TARGETS
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---------------------------
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.. versionadded:: 3.23
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Enforce that link items that can be target names are actually existing targets.
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Set this property to a true value to enable additional checks on the contents
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of the :prop_tgt:`LINK_LIBRARIES` and :prop_tgt:`INTERFACE_LINK_LIBRARIES`
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target properties, typically populated by :command:`target_link_libraries`.
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CMake will verify that link items that might be target names actually name
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existing targets. An item is considered a possible target name if:
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* it does not contain a ``/`` or ``\``, and
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* it does not start in ``-``, and
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* (for historical reasons) it does not start in ``$`` or `````.
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This property is initialized by the value of the
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:variable:`CMAKE_LINK_LIBRARIES_ONLY_TARGETS` variable when a non-imported
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target is created. The property may be explicitly enabled on an imported
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target to check its link interface.
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In the following example, CMake will halt with an error at configure time
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because ``miLib`` is not a target:
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.. code-block:: cmake
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set(CMAKE_LINK_LIBRARIES_ONLY_TARGETS ON)
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add_library(myLib STATIC myLib.c)
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add_executable(myExe myExe.c)
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target_link_libraries(myExe PRIVATE miLib) # typo for myLib
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In order to link toolchain-provided libraries by name while still
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enforcing ``LINK_LIBRARIES_ONLY_TARGETS``, use an
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:ref:`imported <Imported Targets>`
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:ref:`Interface Library <Interface Libraries>` with the
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:prop_tgt:`IMPORTED_LIBNAME` target property:
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.. code-block:: cmake
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add_library(toolchain::m INTERFACE IMPORTED)
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set_property(TARGET toolchain::m PROPERTY IMPORTED_LIBNAME "m")
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target_link_libraries(myExe PRIVATE toolchain::m)
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See also policy :policy:`CMP0028`.
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.. note::
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If :prop_tgt:`INTERFACE_LINK_LIBRARIES` contains generator expressions,
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its actual list of link items may depend on the type and properties of
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the consuming target. In such cases CMake may not always detect names
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of missing targets that only appear for specific consumers.
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A future version of CMake with improved heuristics may start triggering
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errors on projects accepted by previous versions of CMake.
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