1. 2021-07-31 [Bug c++/53878] [C++11] Abstract class constructors gcc-bugs pinskia at gcc dot 2. 2021-07-31 [Bug c++/53878] [C++11] Abstract class constructors gcc-bugs pinskia at gcc dot 3. 2015-09-04 [Bug c++/53878] [C++11] Abstract class constructors gcc-bugs aschepler at gmail