DOS and Win16 Toolchain

This issue should be used for discussions about DOS and Win16 Toolchain support.

Examples

• command.com
• 16 bit DLLs for wowexec (WoW32)

Requirements

• DOS: COM, EXE and LIB
• Win16: EXE, DLL and LIB, Resource compiler, Win16 SDK headers

Options

• OpenWatcom: DOS16, DOS32, Win16, Win32, OS/2 16, OS/2 32, ...
• SmallerC: DOS16, DOS32, Win32, ...
• Digital Mars C/C++: DOS16, DOS32, Win16, Win32

Pros and Cons
OpenWatcom
Full Win16 support (including Resource Compiler, Debugger, GUI tools)
Full OS/2 support (maybe interesting in the future?)
License is considered non-free by the Free Software Foundation
License is OSI certified
Very large (40 MB)
Multi-segment program support

SmallerC
No Win16 support
License is considered free by the Free Software Foundation
License is OSI certified
Very small (about 100 KB)
Poor multi-segment program support

Please share your opinions.