Extern Linkage Type

[Rodney via Digitalmars-d]

Relatively new to D, experienced in other programming languages - 
especially mixed language programming.

Below is code snippets of an extern statement and resulting error 
messages. finance.lib was created from implib, finance.dll was 
created by Free Pascal.  dfinc.d is a simple MS-DOS proof of 
concept program that calls three of the functions in finance.pas.

I am running into the same problem I had calling Silverfrost 
FORTRAN .dll's from D.  The only linkage type that compiles 
error-free is Pascal, for calling subprograms in both FORTRAN 
.dll's and Pascal .dll's (obvious linkage type for Pascal, but 
that produces some other interesting problems - case 
insensitivity for procedure/function names and inverse parameter 
order passing; using a hex editor, was able to verify Free Pascal 
procedure/function names ARE case sensitive).  The D program can 
only call those Free Pascal subprograms whose name is entirely 
upper case.  Both the Silverfrost FORTRAN .dll's and the Free 
Pascal .dll's are using the stdcall call model.

Can anyone please give me some insight?  Possible solutions?  Any 
insights would be appreciated - thanks.

extern (C)
{
	float CMPT_PV (ref short, ref short, ref float, ref float);
	float CMPT_FV (ref short, ref short, ref float, ref float);
	float NPVPROJCT (ref short, ref short, ref float[200], ref 
float[200], ref float, ref float);
}

dmd dfinc.d finance.lib
OPTLINK (R) for Win32  Release 8.00.15
Copyright (C) Digital Mars 1989-2013  All rights reserved.
http://www.digitalmars.com/ctg/optlink.html
dfinc.obj(dfinc)
  Error 42: Symbol Undefined _CMPT_PV
dfinc.obj(dfinc)
  Error 42: Symbol Undefined _CMPT_FV
dfinc.obj(dfinc)
  Error 42: Symbol Undefined _NPVPROJCT
--- errorlevel 3
***************************************
extern (C++)
{
	float CMPT_PV (ref short, ref short, ref float, ref float);
	float CMPT_FV (ref short, ref short, ref float, ref float);
	float NPVPROJCT (ref short, ref short, ref float[200], ref 
float[200], ref float, ref float);
}

dmd dfinc.d finance.lib
OPTLINK (R) for Win32  Release 8.00.15
Copyright (C) Digital Mars 1989-2013  All rights reserved.
http://www.digitalmars.com/ctg/optlink.html
dfinc.obj(dfinc)
  Error 42: Symbol Undefined ?NPVPROJCT@@YAMAAF0AAY0MI at M1AAM2@Z 
(float cdecl NPVPROJCT(short &,short &,float [200]&,float 
[200]&,float &,float &))
dfinc.obj(dfinc)
  Error 42: Symbol Undefined ?CMPT_FV@@YAMAAF0AAM1 at Z (float cdecl 
CMPT_FV(short &,short &,float &,float &))
dfinc.obj(dfinc)
  Error 42: Symbol Undefined ?CMPT_PV@@YAMAAF0AAM1 at Z (float cdecl 
CMPT_PV(short &,short &,float &,float &))
--- errorlevel 3
***************************************
extern (D)
{
	float CMPT_PV (ref short, ref short, ref float, ref float);
	float CMPT_FV (ref short, ref short, ref float, ref float);
	float NPVPROJCT (ref short, ref short, ref float[200], ref 
float[200], ref float, ref float);
}

dmd dfinc.d finance.lib
OPTLINK (R) for Win32  Release 8.00.15
Copyright (C) Digital Mars 1989-2013  All rights reserved.
http://www.digitalmars.com/ctg/optlink.html
dfinc.obj(dfinc)
  Error 42: Symbol Undefined 
_D5dfinc9NPVPROJCTFKsKsKG200fKG200fKfKfZf
dfinc.obj(dfinc)
  Error 42: Symbol Undefined _D5dfinc7CMPT_FVFKsKsKfKfZf
dfinc.obj(dfinc)
  Error 42: Symbol Undefined _D5dfinc7CMPT_PVFKsKsKfKfZf
--- errorlevel 3
***************************************
extern (Windows)
{
	float CMPT_PV (ref short, ref short, ref float, ref float);
	float CMPT_FV (ref short, ref short, ref float, ref float);
	float NPVPROJCT (ref short, ref short, ref float[200], ref 
float[200], ref float, ref float);
}

dmd dfinc.d finance.lib
OPTLINK (R) for Win32  Release 8.00.15
Copyright (C) Digital Mars 1989-2013  All rights reserved.
http://www.digitalmars.com/ctg/optlink.html
dfinc.obj(dfinc)
  Error 42: Symbol Undefined _NPVPROJCT at 24
dfinc.obj(dfinc)
  Error 42: Symbol Undefined _CMPT_PV at 16
dfinc.obj(dfinc)
  Error 42: Symbol Undefined _CMPT_FV at 16
--- errorlevel 3
***************************************
extern (System)
{
	float CMPT_PV (ref short, ref short, ref float, ref float);
	float CMPT_FV (ref short, ref short, ref float, ref float);
	float NPVPROJCT (ref short, ref short, ref float[200], ref 
float[200], ref float, ref float);
}

dmd dfinc.d finance.lib
OPTLINK (R) for Win32  Release 8.00.15
Copyright (C) Digital Mars 1989-2013  All rights reserved.
http://www.digitalmars.com/ctg/optlink.html
dfinc.obj(dfinc)
  Error 42: Symbol Undefined _NPVPROJCT at 24
dfinc.obj(dfinc)
  Error 42: Symbol Undefined _CMPT_PV at 16
dfinc.obj(dfinc)
  Error 42: Symbol Undefined _CMPT_FV at 16
--- errorlevel 3