https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68868
Martin Sebor <msebor at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |ASSIGNED Last reconfirmed| |2015-12-14 Assignee|unassigned at gcc dot gnu.org |msebor at gcc dot gnu.org Ever confirmed|0 |1 Known to fail| |4.9.2, 5.1.0, 6.0 --- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> --- Unfortunately, the simple patch in the Description doesn't work for char literals. I.e., this atomic_char a; atomic_init (a, 'x'); doesn't compile because __typeof__ ('x') is int and calling __atomic_store with pointers to types of mismatching size produces: error: size mismatch in argument 2 of ‘__atomic_store’ atomic_init (a, 'x'); ^ This is likely why Clang implements atomic_init in terms of its __c11_atomic_init intrinsic. Assigning to self to come up with a better patch.