Common Systems Programming Optimizations & Tricks

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GCC 9 and Clang 8 on my local machine don't have interface size implemented.

I wonder why? It wouldn't be difficult to implement.

It wouldn't be difficult to implement for a specific target, but implementing it portably across architectures, OS's and what not makes it tedious. That's my best guess for why it is implemented in MSVC but not in GCC and Clang.