Comment 14 for bug 1266492

Carlos, this is yet another reason why dlopen'ing libgcc_s is simply the wrong thing to do, and libgcc_eh should be static-linked into libc. (The other big reason is the possibility of pthread_cancel aborting the program.) At one time in the distant past, it was necessary for there to only be one copy of this code (and its data) in the whole program; otherwise, exception propagation (or backtracing) across DSOs would not work reliably. But modern unwinding code uses dl_iterate_phdr and works fine even if multiple copies of the code are present in the program.

Fixing this error in the way I describe will greatly simplify glibc and improve its reliability.