https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65132
Bug ID: 65132 Summary: diagnostics: missing: bitfield member cannot have an in-class initializer Product: gcc Version: 5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: jan.kratochvil at redhat dot com class C { bool x:1=false; }; g++ (GCC) 5.0.0 20150219 (experimental): field.C:1:20: error: an assignment cannot appear in a constant-expression clang-3.5.0-6.fc21.x86_64: field.C:1:19: error: bitfield member cannot have an in-class initializer I had no idea what GCC errors on until I asked clang.