Deduplicate it in the process by moving to qstringalgorithms.h. In non-constexpr contexts, both GCC and Clang were giving up in pre-calculating the length if the UTF-16 string literal was too big. For the old code, that was 14 and 16 characters respectively. That number can be raised by adding some Q_ALWAYS_INLINE and (for GCC's case), replacing std::char_traits::find() with std::find(). If that limit is exceeded, we call the newly introduced qustrnlen() function. qustrnlen() is just qustrchr(), like qstrnlen() is just memchr(). But it is introduced as a separate function so we could change implementation if we ever wished to, plus QStringView is only forward-declared at this point. Change-Id: Ieab617d69f3b4b54ab30fffd175c560d926db1c3 Reviewed-by: Ahmad Samir <a.samirh78@gmail.com> Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>