Fortran_FORMAT
Set to FIXED or FREE to indicate the Fortran source layout.
This property tells CMake whether the Fortran source files in a target use fixed-format or free-format. CMake will pass the corresponding format flag to the compiler. Use the source-specific Fortran_FORMAT property to change the format of a specific source file. If the variable CMAKE_Fortran_FORMAT is set when a target is created its value is used to initialize this property.
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https://cmake.org/cmake/help/v3.6/prop_tgt/Fortran_FORMAT.html