You may want give OpenWatcom a try. Some folks are still working on it. https://github.com/open-watcom/open-watcom-v2 https://github.com/open-watcom/open-watcom

You may want give OpenWatcom a try. Some folks are still working on it. https://github.com/open-watcom/open-watcom-v2 https://github.com/open-watcom/open-watcom-v2 In terms of ISO-complianceness, perhaps don't expect much. It basically C89 (the C99 support is still incomplete), and for C++... most likely not even C++98 - compliant.