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Fix -Wimplicit-fallthrough warnings from GCC 8 · fc370b3fRémi Verschelde authored
Adds `FALLTHROUGH` macro to specify when a fallthrough is intentional. Can be replaced by `[[fallthrough]]` if/when we switch to C++17. The warning is now enabled by default for GCC on `extra` warnings level (part of GCC's `-Wextra`). It's not enabled in Clang's `-Wextra` yet, but we could enable it manually once we switch to C++11. There's no equivalent feature in MSVC for now. Fixes #26135.
fc370b3f
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