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diff --git a/Help/policy/CMP0088.rst b/Help/policy/CMP0088.rst new file mode 100644 index 0000000..82c04ef --- /dev/null +++ b/Help/policy/CMP0088.rst @@ -0,0 +1,29 @@ +CMP0088 +------- + +:module:`FindBISON` runs bison in :variable:`CMAKE_CURRENT_BINARY_DIR` +when executing. + +The module provides a ``BISON_TARGET`` macro which generates BISON output. +In CMake 3.13 and below the macro would generate a custom command that runs +``bison`` in the source directory. CMake 3.14 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 to the build +tree rather than the source. + +This policy provides compatibility for projects that have not been updated +to expect the new behavior. + +The ``OLD`` behavior for this policy is for ``BISON_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`` and where +to generate implicit files. + +This policy was introduced in CMake version 3.14. Use the +:command:`cmake_policy` command to set it to ``OLD`` or ``NEW`` explicitly. +Unlike most policies, CMake version |release| does *not* warn +when this policy is not set and simply uses ``OLD`` behavior. + +.. include:: DEPRECATED.txt |