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This directory contains code that is ANSI C but uses parts of the
standard library that are not available to very limited environments
like Linux Kernel modules. The standard calls environments like this
"freestanding implementations."
This does *not* imply that the upb core can be compiled directly on a
freestanding implementation. Even the core uses library functions
that are not directly available on freestanding implementations
(notably malloc()/free(), vsnprintf(), and assert()). So compiling on
freestanding implementations may require implementing compatibility
versions of functions like malloc().
Also, Linux is not technically a freestanding implementation either,
since it does not accept functions that return float or double on
x86-64 (these use SSE registers which are disabled in kernel mode).
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