SyntaxBomb - Indie Coders

https://jmeubank.github.io/tdm-gcc/
tdm-gcc 9.2

http://www.winlibs.com/
winlibs-9.3 and 10.1.0 available (these also include llvm)

The massive undertaking that Brucey has made in order to get everything building using c is pretty incredible.

Note:
I will leave this here as a reference but I went back to the default MinGW provided by Brucey as these appear to cause strange issues, either that or my system is possessed, it is nice to know that alternatives exist, and look at all the changes made to gcc, but if it ain't broken don't fix it.