auto import from //depot/cupcake/@135843

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diff --git a/libc/CAVEATS b/libc/CAVEATS
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--- a/libc/CAVEATS
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-Bionic is a very small C library because we have decided to *not* implement various features
-of the POSIX standard. we only add functions on a as-needed basis, and there are a few things
-we wish we'll never put in there.
-
-this file is here to document explicitely what we don't want to support in Bionic:
-
-- C++ exceptions are not supported. on embedded systems, they lead to extremely larger and
-  slower code for no good reason (even when so-called zero-cost exception schemes are
-  implemented, they enforce very large numbers of registers spills to the stack, even
-  in functions that do not throw an exception themselves).
-
-- pthread cancellation is *not* supported. this seemingly simple "feature" is the source
-  of much bloat and complexity in a C library. Besides, you'd better write correct
-  multi-threaded code instead of relying on this stuff.
-
-- pthread_once() doesn't support C++ exceptions thrown from the init function, or the init
-  function doing a fork().
-
-- locales and wide characters are not supported. we use ICU for all this i18n stuff, which
-  is much better than the ill-designed related C libraries functions.
-
-- at the moment, several user-account-related functions like getpwd are stubbed and return
-  the values corresponding to root. this will be fixed when we'll be able to have distinct
-  users on the Android filesystem. :-(
-
-  see bionic/stubs.c for the details