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
CMAKE_CURRENT_BINARY_DIR as the
WORKING_DIRECTORY of its
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.
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
cmake_policy() command to set it to
NEW explicitly. Unlike most policies, CMake version 3.15.2 does not warn when this policy is not set and simply uses
OLD behavior of a policy is
deprecated by definition and may be removed in a future version of CMake.
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