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VLAs were added in C99, but not universally adopted (particularly by embedded systems compilers, for obvious reasons), and then made optional in C11.

You're completely right, but I think it's worth clarifying that VLA notation in parameter lists, and actual VLAs are two completely different things. The example he showed doesn't actually use a VLA, it just looks like it does.

I don't see an obvious reason - that's all information that's available on compile-time, there should be no additional run-time cost - or what are you implying?

VLA allows for run-time size determination, not compile time

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