People worry about the lack of an everything include file for stdc like libstdc++ had for C++. Worry no more! Now you can also mindlessly use one pch for C!
Honestly, just std C headers is no where near big (and slow) enough to make people want to use pch. At least we should drag POSIX in.
This stuff is GPL 3+ with the GCC Runtime Library Exception 3.1. What does it mean?