VMS Help CC, /FLOAT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

     /FLOAT=option

  Controls the format of floating-point variables.  On OpenVMS VAX
  systems, if you omit both /FLOAT and /G_FLOAT from the command
  line, double variables are represented in D_FLOAT format (unless
  /MIA is specified, in which case the default format is G_FLOAT).

  If you are linking against object-module libraries, a program
  compiled with G_FLOAT format must be linked with the object library
  VAXCRTLG.OLB.

  Options:

   D_FLOAT         Double variables are represented in D_FLOAT
                   format.

   G_FLOAT         Double variables are represented in G_FLOAT
                   format.