Richard Smith f623c96260 Implement DR1330 in C++11 mode, to support libstdc++4.7 which uses it. ... We have a new flavor of exception specification, EST_Uninstantiated. A function type with this exception specification carries a pointer to a FunctionDecl, and the exception specification for that FunctionDecl is instantiated (if needed) and used in the place of the function type's exception specification. When a function template declaration with a non-trivial exception specification is instantiated, the specialization's exception specification is set to this new 'uninstantiated' kind rather than being instantiated immediately. Expr::CanThrow has migrated onto Sema, so it can instantiate exception specs on-demand. Also, any odr-use of a function triggers the instantiation of its exception specification (the exception specification could be needed by IRGen). In passing, fix two places where a DeclRefExpr was created but the corresponding function was not actually marked odr-used. We used to get away with this, but don't any more. Also fix a bug where instantiating an exception specification which refers to function parameters resulted in a crash. We still have the same bug in default arguments, which I'll be looking into next. This, plus a tiny patch to fix libstdc++'s common_type, is enough for clang to parse (and, in very limited testing, support) all of libstdc++4.7's standard headers. llvm-svn: 154886		2012-04-17 00:58:00 +00:00
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except.handle	Add -fcxx-exceptions to all tests that use C++ exceptions.	2011-02-28 00:40:07 +00:00
except.spec	Implement DR1330 in C++11 mode, to support libstdc++4.7 which uses it.	2012-04-17 00:58:00 +00:00