Syntax:
The /keep option creates one object file for each input source file specified, which may not be desirable when compiling multiple source files. The /keep option does not remove temporary files, which might be created by the FPP preprocessor or the Visual Fortran compiler.
If the /keep option is specified, the FPP output files and object files are created in the current directory and retained. The /keep option also affects the number of files that are created and the file names used for these files.