ICC miscompiles this: struct Inner { int i; constexpr Inner(int i) : i(i) {}}; struct Outer { Inner i; }; const Outer x = { -1 }; (Inner = QBasicAtomicInt; Outer = QtPrivate::RefCount, then again for QListData::Data) We expect x to be placed in read-only memory and require no load-time constructor. ICC unfortunately does not do that. By adding a constexpr constructor to Outer, it starts behaving like we expect it to, but falls apart again if you do "const Outer x[]" (the QArrayData statics). The solution is to probably make the varaibles constexpr too, but that's a job for the development branch. Intel issue Id: 6000056211 Intel bug: DPD200534796 Change-Id: Ie9fb5428106486254b7329403890754f300d58c1 Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>