https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64670
--- Comment #10 from Jason Merrill <jason at gcc dot gnu.org> --- (In reply to Tobias Burnus from comment #9) > In the real code, one has something like the following, which I tried to > mimic in the test case. If I understood your comment correctly, I should use > in "log.c" not only 'implementation "log.h"' but additionally(?) > 'implementation "LogListener.h"' - i.e. using 'pragma implementation' for > LogListener.h's classes only in LogListener.h is not sufficient? Having #pragma implementation in LogListener.cc is sufficient: > The real-world LogListener.o has (full output as it is short): ... > 0000000000000000 V typeinfo for LogListener So why are you getting an undefined reference?
