https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61625
--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- _Atomic is a qualifier. ISO C11 requires that assignments between atomic and non-atomic versions of the same type work, and that lvalue conversion produces the non-atomic version of the type, and that assignment to an _Atomic variable has memory_order_seq_cst semantics. You appear to be requesting something contradicting the requirements of ISO C. ATOMIC_VAR_INIT is required for certain classes of implementation permitted by ISO C but not relevant to GCC (those that include lock data as part of the representation of an atomic type, so that undefined behavior would result from assignment to the type without special initialization - assignment from the non-atomic type must work, but *only* given that the object has been properly initialized first).
