[LLVMdev] Why __GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__ are defined as 4, 2, 1 in clang?

[Yuri]

clang isn't GNU C. So why does it define such values and why they are 4,2,1?
It also defines __GNUC_STDC_INLINE__=1 for some reason.

rev.126022

Yuri