hintonda added a comment.
Actually, this will never work correctly -- in fact, raw lexing will always be
problematic. Consider:
void foo()
#if !__has_feature(cxx_noexcept)
throw(std::bad_alloc)
#endif
{}
In this case we *could* figure out if __has_feature(cxx_noexcept) evaluated to
true or false, but what if it was a macro instead? We can't reliably handle it
without reparsing the whole thing.
I'll leave it as is for now, but once http://reviews.llvm.org/D20428 is
available, I'll start a new diff using it.
http://reviews.llvm.org/D18575
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