https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98485
--- Comment #3 from Braden Obrzut <admin at maniacsvault dot net> --- Created attachment 49864 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49864&action=edit More well defined variant Added a variant of the code which has all specializations visible at all uses. Only thing hidden is the S1<T>::f1 definition itself which should be valid to do given explicit instantiations. Same behavior of the second specialization having different linkage for some reason. Although in this case a compiler warning is produced on main.cpp. main.h:25:28: warning: ‘static void S1<T>::f1() [with T = S3]’ used but never defined Interestingly despite presumably being more well defined Clang 11 doesn't like this version at all.
