Btw, dont’t remember Turbo C or Borland C++ to be able to compile to 32-bit x86 on DOS
Borland C++, Microsoft C/C++, and GCC (DJGPP[1]) could all target 32-bit extended DOS, but Watcom was the first[2] to bundle a royalty-free DOS extender[3].
[1] https://news.ycombinator.com/item?id=39038095
The actual killer feature of Watcom C/C++ was not the C or C++ compiler, but its integration with DOS4GW.