creating dll to link with delphi program

[Tobias Burnus]

Brad Finney wrote:
> Yes, I did try his suggestion, but missed the addition of the bind(c, 
> name= " "). 

Well, that was the most important part ...

> Thanks for getting me to read more carefully!  That does correct the 
> case issue, but not (for me) the underscore issue, which is very 
> puzzling.  I took the exact code you listed and got a leading 
> underscore on Foo and bar.
>
> F:\FlowReader>nm foo.o
> 00000000 T _Foo

The leading _ is added there because the ABI (application binary 
interface) of 32bit Windows *requires* it. If you don't like it, blame 
Microsoft.

Are you sure that you do not need the leading underscore? I do not want 
to rule out that Delphi is broken,  but the 32bit Windows ABI makes 
pretty clear that Windows should have a leading underscore, see:

http://msdn.microsoft.com/en-us/library/zkwh89ks%28v=vs.71%29.aspx
http://msdn.microsoft.com/en-us/library/zxk0tw93%28v=VS.71%29.aspx

Thus, I think your problem should be elsewhere. Can you check what 
Delphi actually wants? Does it use STDCALL or CDECL? How does it call 
Windows functions - which all start with a leading underscore?

Regarding CDECL/STDCALL: With CDECL (default in GCC), the caller puts 
the procedure arguments on the the stack, calls the procedure and then 
pops it from the stack. With STDCALL, the caller puts the actual 
arguments on the stack and calls the procedure - but here the called 
procedure pops the stack. STDCALL is the widely used by (32bit) 
Microsoft's DLL - but not by all of their libraries. - It might be that 
Delphi on Windows uses STDCALL by default - but it could also use 
STDCALL (or in principle also FASTCALL). For those, see the two MS links 
above and 
http://gcc.gnu.org/onlinedocs/gfortran/Mixed_002dLanguage-Programming.html

Tobias