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Since C++20 there is no longer a trivial default constructor available for atomic objects. See: https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0883r2.pdf https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117475 We already assume that an atomic integer can be stored in a normal integer and has the same representation in C and C++. Update #5145.