Fortran_FORMAT
Set to FIXED or FREE to indicate the Fortran source layout.
This property tells CMake whether a given Fortran source file uses fixed-format or free-format. CMake will pass the corresponding format flag to the compiler. Consider using the target-wide Fortran_FORMAT property if all source files in a target share the same format.
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https://cmake.org/cmake/help/v3.15/prop_sf/Fortran_FORMAT.html