/iface

Syntax:

/iface[:keyword...]

The /iface option determines the type of argument-passing conventions used by your program for general arguments and for hidden-length character arguments.

In the visual development environment, specify the Default Calling Conventions and the String Length Argument Passing in the External Procedures Compiler Option Category. The /iface keywords are as follows:

• The general argument-passing convention keywords are one of: cref, stdref, and default (stdref and default are equivalent). The functions performed by each are described in the following table:
  
  

  	/iface:cref	/iface:default	/iface:stdref
  Arguments are passed	By reference	By reference	By reference
  Append @n to names on ia32 systems?	No	Yes	Yes
  Who cleans up stack	Caller	Callee	Callee
  Var args support?	Yes	No	No

  
  
• To specify the convention for passing the hidden-length character arguments, specify /iface:[no]mixed_str_len_arg:
  • /iface:mixed_str_len_arg

    Requests that the hidden lengths be placed immediately after their corresponding character argument in the argument list, which is the method used by Microsoft Fortran PowerStation.

  • /iface:nomixed_str_len_arg

    Requests that the hidden lengths be placed in sequential order at the end of the argument list, which is the method used by Compaq Fortran for Tru64 UNIX systems by default. When porting mixed-language programs that pass character arguments, either this option must be specified correctly or the order of hidden length arguments changed in the source code.

If you omit the /iface option, the following is used:

  /iface=(default,mixed_str_len_arg)

For more information on argument passing, see Programming with Mixed Languages.