clang-tidy: add <LANG>_CLANG_TIDY_EXPORT_FIXES_DIR property

Fixes: #21362

1 files changed, 29 insertions, 0 deletions

diff --git a/Help/prop_tgt/LANG_CLANG_TIDY_EXPORT_FIXES_DIR.rst b/Help/prop_tgt/LANG_CLANG_TIDY_EXPORT_FIXES_DIR.rst
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+<LANG>_CLANG_TIDY_EXPORT_FIXES_DIR
+----------------------------------
+
+.. versionadded:: 3.26
+
+This property is implemented only when ``<LANG>`` is ``C``, ``CXX``, ``OBJC``
+or ``OBJCXX``, and only has an effect when :prop_tgt:`<LANG>_CLANG_TIDY` is
+set.
+
+Specify a directory for the ``clang-tidy`` tool to put ``.yaml`` files
+containing its suggested changes in. This can be used for automated mass
+refactoring by ``clang-tidy``. Each object file that gets compiled will have a
+corresponding ``.yaml`` file in this directory. After the build is completed,
+you can run ``clang-apply-replacements`` on this directory to simultaneously
+apply all suggested changes to the code base. If this property is not an
+absolute directory, it is assumed to be relative to the target's binary
+directory. This property should be preferred over adding an ``--export-fixes``
+or ``--fix`` argument directly to the :prop_tgt:`<LANG>_CLANG_TIDY` property.
+
+At generate-time, in order to avoid passing stale fixes from old code to
+``clang-apply-replacements``, CMake will search the directory for any ``.yaml``
+files that won't be generated by ``clang-tidy`` during the build, and delete
+them. In addition, just before running ``clang-tidy`` on a file, CMake will
+delete that file's corresponding ``.yaml`` file in case ``clang-tidy`` doesn't
+produce any fixes.
+
+This property is initialized by the value of
+the :variable:`CMAKE_<LANG>_CLANG_TIDY_EXPORT_FIXES_DIR` variable if it is set
+when a target is created.