I am using Microsoft (R) C/C++ Optimizing Compiler Version 14.00.40121 for
AMD64 to port a dll (C, C++ and fortran files) for WS2003. I am working with
VS2003, with customized paths in Tools > Options > Project > VC++ Directories
in order to correctly target the compiler executables and associated
libs/headers (Program Files\Microsoft Visual Cpp\Bin\x86_amd64, etc).

I am actually facing a link issue because C symbols are not generated with
the '_' prefix when I use the default calling convention __cdecl(/Gd):
expected "_routine" and got "routine" (checked with dumpbin /symbol
routine.obj).
The same code compiled with standard VS2003 compiler (win32) has the '_'
prefix: "_routine".

For testing purposes, I've tried also fastcall and stdcall conventions and
noticed no change on the symbol name even if the buildLog.htm shows that the
correct cl.exe option is used.

I am working with someone else in another country to compile the same code.
He has the same install and uses the exact same options he is able to link.

I would appreciate some quick help on this topic, thanks in advance.