OSDev.org

PCC now builds and generates valid code (with a few quirks and such) on AMD64. The support libraries also have floating point support and a proper C support unit. Now that amd64 hosts are enabled, anyone that would like to test it feel free to do so. Bug reporting is a big thing right now, so if you have the time, try it out and give some feedback.

(Disclaimer: I'm not a member nor affiliate of the PCC project, but I do really wish for it to succeed.)

One of my goals of AlloyOS was to build cleanly with BSD tools and GNU tools, including pcc, so it is definitely suitable for system programming.. just a little difficult to configure a crosscompiler using a custom C library(as in, I never got it to work without -L hackery)