[msingle]

Worth pointing out here is harvey (http://harvey-os.org). Which is a descendent of Plan 9 but with updates for toolchains & architecture.

[swiley]

One of the things I like a lot about plan9 is that it doesn't use GCC.

[floren]

You can build Harvey with clang if you prefer, or possibly even pcc. Getting Harvey compiling with GCC/clang meant translating Plan 9's C dialect into ISO C. The translation process means there wasn't a lot of opportunity to introduce GCCisms, so any standards-compliant C compiler should be able to build Harvey. I say should because you may run into one or two small nits that have to be fixed before it'll work, and of course you have to find an up-to-date C compiler that's not GCC or Clang (I guess it would be good to try icc?)

[jadbox]

Do you have experience with it? Does it improve upon Plan9 in any fundamental way, side from incremental toolchain/arch support?

[henesy]

I mean the whole idea of Harvey is that they get Plan 9 building under gcc.

Whether that's a good idea or not depends on who you talk to.