erichkeane added a comment.
In https://reviews.llvm.org/D45383#1069049, @efriedma wrote:
> We can could add an exception to the "don't allow redeclarations with custom
> type-checking" rule to specifically allow redeclaring `__va_start`. The
> general rule is that we don't want user code redeclaring them because they
> don't have a specific signature, so our internal representation could change
> between releases. But `__va_start` has a specific fixed signature from the
> Microsoft SDK headers, so it should be fine to allow redeclaring it without a
That still doesn't fix the bug, since redeclaring __va_start in 'C' mode when
va_list is a reference type causes the assert.
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