Until about Tcl 8.0.3, Tcl was compiled with Borland`s C++ compiler. With 8.0.3 and beyond, the Scriptics team switched to
Microsoft`s C++ compiler, Visual C++.
Michael I Schwartz has a good note at http://www.egroups.com/list/wintcl/316.html on how to continue using Borland`s C++
compiler with DLLs compiled by Microsoft`s compiler.