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The following C99 features are supported by any buildbot compiler (including
obscure ones on snakebite):

\- stdint.h

\- static inline functions in header files

\- extern inline functions (not really necessary for CPython)

\- variadic macros


I'd like to add:

\- standard conforming C99 spelling of the "struct hack" (supported by gcc
since I can remember). Our current way leads to problems for some
analyzers.


Some people (not me) would like:

\- variable declarations everywhere (rather than only at the beginning
of blocks).



I think this would probably be enough for the start. Obviously things
like variable-length arrays should never be used anyway.