simoncook added a comment.
I think this should also cover mismatched arguments if the attribute appears
several times, and reject/warn about the attribute combination in these cases.
For example, `__attribute__((interrupt("machine")))
__attribute__((interrupt("user"))) void foo() {}` is accepted, and adds the
attribute `"interrupt"="user"`. It seems whichever is first used appears on the
function.
I don't have an up to date GCC to compare to see what it does in this case, nor
am sure whether repeating the same interrupt type should be accepted.
https://reviews.llvm.org/D48412
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