https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65132
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Target Milestone|--- |8.0 Resolution|--- |FIXED --- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Fixed in GCC 8.0. C++20 added support for this feature and GCC enables it as an extension for C++11+ with a warning: <source>:1:19: warning: default member initializers for bit-fields only available with -std=c++2a or -std=gnu++2a class C { bool x:1=false; }; ^ ASM generation compiler returned: 0 <source>:1:19: warning: default member initializers for bit-fields only available with -std=c++2a or -std=gnu++2a class C { bool x:1=false; }; ^