message: The change implementing -Wno-unused-but-set-variable in clang was reverted, so commenting iit out for now.
diff: @@ -427,9 +427,10 @@ if (MSVC)
  set_source_files_properties(${BISON_OUTPUT} PROPERTIES COMPILE_FLAGS "/wd4005 /wd4065")
  else()
  target_compile_options(${PROJECT_NAME} PRIVATE -Wall -Wno-sign-compare -Wno-unused-function -Werror ${LLVM_CPP_FLAGS})
  - if (${LLVM_VERSION_NUMBER} VERSION_GREATER_EQUAL "13.0.0")
  - set_source_files_properties(${BISON_CPP_OUTPUT} PROPERTIES COMPILE_FLAGS "-Wno-unused-but-set-variable")
  - endif()
  + # The change implementing -Wno-unused-but-set-variable in clang was reverted, so commenting out for now.
  + #if (${LLVM_VERSION_NUMBER} VERSION_GREATER_EQUAL "13.0.0")
  + # set_source_files_properties(${BISON_CPP_OUTPUT} PROPERTIES COMPILE_FLAGS "-Wno-unused-but-set-variable")
  + #endif()
  # Security options
  target_compile_options(${PROJECT_NAME} PRIVATE -fstack-protector-strong
  -fdata-sections -ffunction-sections -fno-delete-null-pointer-checks
  