[cfe-commits] [Patch][libc++] Mark vector:: and string::empty() as warn_unused_result

[Nico Weber]

Hi,

the attached patch marks vector:: and string::empty() as
warn_unused_result. It looks like it's fairly often confused with
clear() in practice:

https://breakpad.appspot.com/377003/
http://codereview.chromium.org/10034006/
http://www.viva64.com/en/a/0079/ (search for "empty")

See also http://llvm.org/bugs/show_bug.cgi?id=10011 for a more general approach.

Nico
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