glibc already does this, all binaries compiled with glibc use
int as pid_t (which is four bytes on linux/x86). Thus the kernel
can change as soon as all have switched to libc6 (aka glibc-2)
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for a pentium-optimizing gcc, look at http://www.goof.com/pcg
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----==-- _
---==---(_)__ __ ____ __ Marc Lehmann
--==---/ / _ \/ // /\ \/ / mlehmann@hildesheim.sgh-net.de
-=====/_/_//_/\_,_/ /_/\_\ pcg@goof.com
The choice of a GNU generation