CMakeList "GCC_OR_CLANG" doesn't work

[ZypherChan]

I complie on Windows System.
And Cmake the CMakeLists in \sfntly\cpp\CMakeLists.txt.
I use the VS2019 to open the sln and found the commandline has "__wur=attribute((warn_unused_result)) -Wall -Werror -fno-exceptions".
At last, the reason is "set(GCC_OR_CLANG ((CMAKE_CXX_COMPILER_ID MATCHES "Clang") OR CMAKE_COMPILER_IS_GNUCXX))" doesn't work.