Fails compilation with "catching polymorphic type ‘class std::exception’"

On Ubuntu 20.04 the source code fails to compile with the following error message:

gnuclad.cpp: In function ‘int main(int, char**)’:
gnuclad.cpp:145:21: error: catching polymorphic type ‘class std::exception’ by value [-Werror=catch-value=]
  145 | } catch(exception e) {

Simple replacing "e" with "&e" in line 145 of gnuclad.cpp does solve the warning. It resembles the problem described here:
https://stackoverflow.com/questions/6755991/catching-stdexception-by-reference