set_source_files_properties with /Tp and /Tc

Usage
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2

I checked this further and the below works instead of manually specifying platform switches:

set_source_files_properties(${CMAKE_CURRENT_SOURCE_DIR}/abc/x.c PROPERTIES LANGUAGE CXX)
set_source_files_properties(${CMAKE_CURRENT_SOURCE_DIR}/abc/y.c PROPERTIES LANGUAGE CXX)

thank you.