/SEPARATE_COMPILATION
  /NOSEPARATE_COMPILATION  (D)

  Specifies that a source file that contains multiple
  separately-compiled programs (SCPs) should be compiled into an
  object file that consists of a concatenation of modules, each
  containing a single procedure.  This object may be inserted into
  an object library from which the linker can extract the procedures
  that are specifically needed.

  The default, /NOSEPARATE_COMPILATION, specifies that such a program
  should be compiled as a single unit, producing an object file that
  consists of one module with multiple embedded procedures.  If this
  object is inserted into an object library and any part of a module
  must be loaded, the linker must extract the entire object.