cpp: support/CPPUtils.cpp: replace clang attribute [[clang::fallthrou… #3382
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…gh]]
[[clang::fallthrough]] has been used to mark a switch branch target to
be falling through, however just if
clang
has been used.Since C++17, [[fallthrough]] is a part of the standard:
https://en.cppreference.com/w/cpp/language/attributes/fallthrough
It's recoginzed by MSVC, clang, GCC and respected when using all the C++
versions at least from C++11 upwards.
This change also removes warning in the switch, which would happen when
compiling with GCC.