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diff --git a/Help/policy/CMP0098.rst b/Help/policy/CMP0098.rst new file mode 100644 index 0000000..6d1443b --- /dev/null +++ b/Help/policy/CMP0098.rst @@ -0,0 +1,30 @@ +CMP0098 +------- + +:module:`FindFLEX` runs ``flex`` in directory +:variable:`CMAKE_CURRENT_BINARY_DIR` when executing. + +The module provides a ``FLEX_TARGET`` macro which generates FLEX output. +In CMake 3.16 and below the macro would generate a custom command that runs +``flex`` in the current source directory. CMake 3.17 and later prefer to +run it in the build directory and use :variable:`CMAKE_CURRENT_BINARY_DIR` +as the ``WORKING_DIRECTORY`` of its :command:`add_custom_command` invocation. +This ensures that any implicitly generated file is written relative to the +build tree rather than the source tree, unless the generated file is +provided as absolute path. + +This policy provides compatibility for projects that have not been updated +to expect the new behavior. + +The ``OLD`` behavior for this policy is for ``FLEX_TARGET`` to use +the current source directory for the ``WORKING_DIRECTORY`` and where +to generate implicit files. The ``NEW`` behavior of this policy is to +use the current binary directory for the ``WORKING_DIRECTORY`` relative to +which implicit files are generated unless provided as absolute path. + +This policy was introduced in CMake version 3.17. Use the +:command:`cmake_policy` command to set it to ``OLD`` or ``NEW`` explicitly. +Unlike many policies, CMake version |release| does *not* warn +when this policy is not set and simply uses ``OLD`` behavior. + +.. include:: DEPRECATED.txt |