FindBISON: Add policy CMP0088 to run bison in build tree

1 files changed, 29 insertions, 0 deletions

diff --git a/Help/policy/CMP0088.rst b/Help/policy/CMP0088.rst
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+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