https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97905
--- Comment #1 from David Binderman <dcb314 at hotmail dot com> --- Reduced C++ test case seems to be: template <typename> void a() { extern int *b; } int *b; git bisect proceeds in other window. If all I am interested in is the performance of cc1plus, which make target should I use to build only this binary and not all the C and C++ libraries ?