The lengthHelperContainer() implementation for sizeof(Char) == 1 case is using qstrnlen() for the non-constexpr case. qstrnlen() is an inline function which is effectively a nullptr check and a memchr() call. For some reason, on MSVC this combination resulted in very slow compilation for the user projects, where each call to QObject::setObjectName() was hitting this codepath. Fix it by replacing the qstrnlen() call with strnlen_s() for MSVC. It seems that for now all versions of MSVC are affected. However, introduce a new Q_COMPILER_SLOW_QSTRNLEN_COMPILATION definition, which will allow us to check for the compiler version later on. For now this definition is set for all MSVC versions unconditionally. Fixes: QTBUG-124376 Pick-to: 6.7.1 Change-Id: Id769bef1e950ffa756acf7af39d362fd8b112019 Reviewed-by: Oliver Wolff <oliver.wolff@qt.io> Reviewed-by: Marc Mutz <marc.mutz@qt.io> (cherry picked from commit d849cb80a4ba468e2c6097ebfcab384ddaec8e67) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
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