[Bug bootstrap/107728] with -O0, libgcc in the first stage compiler has reference to libc functions

[arnout at mind dot be via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107728

--- Comment #5 from Arnout Vandecappelle <arnout at mind dot be> ---
Based on

> glibc builds needs to be fixed such that it does not reference the function 
> in the unwinder at -O0

I've traced through the map file why this symbol is pulled in:

/.../libgcc.a(unwind-dw2.o)
                              /.../libgcc.a(_umoddi3.o) (_Unwind_Resume)
/.../libgcc.a(unwind-dw2-fde-dip.o)
                              /.../libgcc.a(unwind-dw2.o) (_Unwind_Find_FDE)

In other words, _umoddi3.o is the one that pulls in the unwinder.