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Currently in the top-level cmake and in atmos_cube_sphere cmake we use the -nowarn flag (Intel compiler) which suppress all compiler warnings.
$ grep -r nowarn .
./cmake/Intel.cmake:set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -g -traceback -fpp -fno-alias -auto -safe-cray-ptr -ftz -assume byterecl -nowarn -sox -align array64byte -qno-opt-dynamic-align")
./FV3/atmos_cubed_sphere/cmake/compiler_flags_Intel_Fortran.cmake:set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -g -traceback -fpp -fno-alias -auto -safe-cray-ptr -ftz -assume byterecl -nowarn -sox -align array64byte -qno-opt-dynamic-align ${${kind}_flags}")
According to "NCEP Central Operations WCOSS Implementation Standards" this is not allowed (page 15 section IV B. (5)):
"Code must compile without errors or warnings. Errors and warnings may not be suppressed, and the compiler warning level ("-W" options) must be at least the default one."
We should remove this flag (from ufs-weather-model and atmos_cubed_sphere) and start working on eliminating all warnings.
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