This header uses std::is_trivial_v, which requires including the <type_traits> header. When building with PCH enabled (which is the default), this dependency does get satisfied via the PCH, so no issue is visible. This fixes building with recent version of libc++ when configured with _LIBCPP_REMOVE_TRANSITIVE_INCLUDES (which removes unnecessary transitive dependencies between the libc++ headers, a configuration which may become the default in the future), with PCH disabled. Pick-to: 6.5 6.2 Change-Id: I5e3ae20e366ed3028b1156cee05bcf2908d6e845 Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com> (cherry picked from commit adb49d65e0774fa6be0b0d9d490c6f1fc5066a1b) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
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