[Bug c++/97905] ice in duplicate_decls, at cp/decl.c:2754

[dcb314 at hotmail dot com]

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 ?