CMake/Help/release/dev/genex-COMPILE_LANG_AND_ID.rst

genex-COMPILE_LANG_AND_ID
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* A new ``COMPILE_LANG_AND_ID`` generator expression was introduced to
  allow specification of compile options for target files based on the
  :variable:`CMAKE_<LANG>_COMPILER_ID`  and :prop_sf:`LANGUAGE` and of
  each source file.