> GCC already has -ffreestanding to suppress this behavior.  If you're
> not freestanding, you're hosted, so there is no need for any other
> option.

I don't get it.  You're saying that every hosted environment has
exactly the same set of extensions to standard libraries - the same set
of additional provisions, of semantics defined in cases where the
standard is silent or specifies undefined behaviour?

I can't really make myself believe that; you know better.

But if not, I don't see how you get to the "there is no need..."
conclusion from that premise.

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