John McCall 5677499fbf First pass at implementing C++ enum semantics: calculate (and store) an ...

"integer promotion" type associated with an enum decl, and use this type to
determine which type to promote to.  This type obeys C++ [conv.prom]p2 and
is therefore generally signed unless the range of the enumerators forces
it to be unsigned.

Kills off a lot of false positives from -Wsign-compare in C++, addressing
rdar://7455616

llvm-svn: 90965

2009-12-09 09:09:27 +00:00

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