[Bug c++/92951] extern variable declaration doesn't behave properly for me

[fportera2 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92951

--- Comment #6 from Filippo Portera <fportera2 at gmail dot com> ---
Created attachment 47505
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47505&action=edit
implementation file

where I would like to use the training variable