VMS Help PASCAL, /PSECT_MODEL=[NO]MULTILANGUAGE D=/PSECT_MODEL=NOMULTILANGUAGE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

                                   OpenVMS Alpha only

  Controls whether the compiler pads the size of  overlaid  PSECTs
  so  as  to ensure compatibility when the PSECT is shared by code
  created by other OpenVMS compilers.

  When a PSECT generated with a  [COMMON]  attribute  is  overlaid
  with a PSECT consisting of a C struct or a Fortran COMMON block,
  linker error messages may result due to the  inconsistent  sizes
  of  the  PSECTs,  some  languages  pad  the size of PSECTs while
  others do not.

  Compiling /PSECT_MODEL=MULTILANGUAGE ensures that Compaq  Pascal
  will follow a consistent PSECT size allocation scheme that works
  with C and  Fortran  PSECTs  that  are  shared  across  multiple
  images.   PSECTs shared in a single image do not have a problem.
  The    corollary    switch    for    the    C    compiler     is
  /PSECT_MODEL=[NO]MULTILANGUAGE,  the  corollary  switch  for the
  Fortran compiler is /ALIGNMENT=COMMON=[NO]MULTILANGUAGE.

  The     default     behavior     of     Compaq     Pascal     is
  /PSECT_MODEL=NOMULTILANGUAGE  which  is the behavior of previous
  releases  of  Compaq  Pascal  and   is   sufficient   for   most
  applications.