Merge "Delete CAVEATS / fix spelling."
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libc/CAVEATS
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libc/CAVEATS
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Bionic is a very small C library because we have decided to *not* implement various features
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of the POSIX standard. we only add functions on a as-needed basis, and there are a few things
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we wish we'll never put in there.
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this file is here to document explicitely what we don't want to support in Bionic:
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- C++ exceptions are not supported. on embedded systems, they lead to extremely larger and
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slower code for no good reason (even when so-called zero-cost exception schemes are
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implemented, they enforce very large numbers of registers spills to the stack, even
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in functions that do not throw an exception themselves).
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- pthread cancellation is *not* supported. this seemingly simple "feature" is the source
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of much bloat and complexity in a C library. Besides, you'd better write correct
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multi-threaded code instead of relying on this stuff.
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- pthread_once() doesn't support C++ exceptions thrown from the init function, or the init
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function doing a fork().
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- locales and wide characters are not supported. we use ICU for all this i18n stuff, which
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is much better than the ill-designed related C libraries functions.
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- at the moment, several user-account-related functions like getpwd are stubbed and return
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the values corresponding to root. this will be fixed when we'll be able to have distinct
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users on the Android filesystem. :-(
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see bionic/stubs.c for the details
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@ -32,7 +32,7 @@ extern int __cxa_atexit(void (*)(void*), void*, void* );
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/* The "C++ ABI for ARM" document states that static C++ constructors,
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* which are called from the .init_array, should manually call
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* __aeabi_atexit() to register static destructors explicitely.
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* __aeabi_atexit() to register static destructors explicitly.
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*
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* Note that 'dso_handle' is the address of a magic linker-generate
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* variable from the shared object that contains the constructor/destructor
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