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60 lines
2.8 KiB
60 lines
2.8 KiB
ENABLE_EXPORTS
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--------------
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Specify whether an executable or a shared library exports symbols.
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Normally an executable does not export any symbols because it is the
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final program. It is possible for an executable to export symbols to
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be used by loadable modules. When this property is set to true CMake
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will allow other targets to "link" to the executable with the
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:command:`target_link_libraries` command. On all platforms a target-level
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dependency on the executable is created for targets that link to it.
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Handling of the executable on the link lines of the loadable modules
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varies by platform:
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* On Windows-based systems (including Cygwin) an "import library" is
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created along with the executable to list the exported symbols.
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Loadable modules link to the import library to get the symbols.
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* On macOS, loadable modules link to the executable itself using the
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``-bundle_loader`` flag.
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* On AIX, a linker "import file" is created along with the executable
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to list the exported symbols for import when linking other targets.
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Loadable modules link to the import file to get the symbols.
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* On other platforms, loadable modules are simply linked without
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referencing the executable since the dynamic loader will
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automatically bind symbols when the module is loaded.
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This property is initialized by the value of the
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:variable:`CMAKE_EXECUTABLE_ENABLE_EXPORTS` variable, if it is set when an
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executable target is created. If :variable:`CMAKE_EXECUTABLE_ENABLE_EXPORTS`
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is not set, the :variable:`CMAKE_ENABLE_EXPORTS` variable is used to initialize
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the property instead for backward compatibility reasons.
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See below for alternative initialization behavior for shared library targets.
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.. versionadded:: 3.27
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On Apple platforms, to link with a shared library (either a bare library or a
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framework), a linker import file can be used instead of the actual shared
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library. These linker import files are also known as text-based stubs, and
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they have a ``.tbd`` file extension.
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The generation of these linker import files, as well as their consumption, is
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controlled by this property. When this property is set to true on a shared
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library target, CMake will generate a ``.tbd`` file for the library.
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Other targets that link to the shared library target will then use this
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``.tbd`` file when linking rather than linking to the shared library binary.
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.. note::
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For backward compatibility reasons, this property will be ignored if the
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:prop_tgt:`XCODE_ATTRIBUTE_GENERATE_TEXT_BASED_STUBS <XCODE_ATTRIBUTE_<an-attribute>>`
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target property or the
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:variable:`CMAKE_XCODE_ATTRIBUTE_GENERATE_TEXT_BASED_STUBS <CMAKE_XCODE_ATTRIBUTE_<an-attribute>>`
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variable is set to false.
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For shared library targets, this property is initialized by the value of the
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:variable:`CMAKE_SHARED_LIBRARY_ENABLE_EXPORTS` variable, if it is set when
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the target is created.
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