[Bug c++/80469] Undefined symbol for abstract class impl with -fvisibility=hidden

[theubik at mail dot ru]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80469

--- Comment #3 from Ubikovich <theubik at mail dot ru> ---
>> You need to provide the definition of dothis() somewhere.

There is the definition:

// subimpl.cpp
#include "subimpl.h"
void A::dothis() {}