[Bug c++/65159] Linker forgets definition of type_info::__is_pointer_p

[potswa at mac dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65159

--- Comment #12 from David Krauss <potswa at mac dot com> ---
I did exactly the steps that I mentioned: cleanly build r220825, update to
r220000, and build again without cleaning first. The object being to roughly
replicate the conditions when the bug was originally observed — except
originally the update was in the other direction, r220000-ish to r220825.

Is it always an error to do a non-clean build? The problem seems to happen
pretty regularly.