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QGlobalStatic has a warning suppression for -Wtsan because of its usage of std::atomic_thread_fence, which TSAN doesn't support. That header is included in QtCore's PCH, and that triggers a GCC bug that causes the warning to be emitted despite the suppression [1]. In a developer build, the warning turns fatal. We could either disable PCHs in such a build configuration (TSAN+developer-build+GCC < 15), or: simply make the warning non-fatal on earlier compiler versions. [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64117 Pick-to: 6.8 6.5 Fixes: QTBUG-134415 Change-Id: If80a4acdb1372d00804a60361f6c3d6893b96106 Reviewed-by: David Faure <david.faure@kdab.com> Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io> (cherry picked from commit a72077a88903fe532f6a749677eb4da4ea99f79f) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>