> I'm astounded that they support those architectures

I work on PG, and I'm regularly astounded too...

As long as the compilers are new enough, the burden isn't too high though. Previously it prevented us from using atomics for some concurrency optimized things, but now we've an atomics implementation that, at compile time, falls back to a spinlock backed atomics implementation. Slightly complicated by the fact that we don't even have a hard dep on a spinlock implementation, falling back to semaphores :)

Ah. Fun.

But seriously, the thing that hurts more is that we only require a C89 compiler :/