HP SunSoft Pascal 4.0 - Manual (Page 112)

88 Pascal 4.0 User’s Guide
5
For routines declared extern fortran or external fortran , the changes
in the calling sequence are as follows:
•
For value parameters, the compiler creates a copy of the actual argument
value in the caller’s environment and passes a pointer to the temporary
variable on the stack. Thus, you need not create (otherwise useless)
temporary variables.
• The compiler appends an underscore to the name of the external procedure
to conform to a naming convention of the
f77 (1) compiler. Pascal
procedure names called from FORTRAN must supply their own trailing
underscore ( _ ).
• Multidimensional Pascal arrays are not compatible with FORTRAN arrays.
Because FORTRAN uses column-major ordering, a multidimensional
Pascal array passed to FORTRAN appears transposed.
For routines declared extern c or external c , a warning is generated if you
attempt to pass a nested function.
When you compile your program with the –xl option, you can also use
nonpascal to declare non-Pascal routines when porting DOMAIN programs
written in DOMAIN Pascal, FORTRAN , and C.