backtrace_syms = backtrace_symbols(e->bt, e->used);
/* ignore first one, which is this xbt_backtrace_current() */
e->used--;
memmove(backtrace_syms, backtrace_syms + 1, sizeof(char *) * e->used);
backtrace_syms = backtrace_symbols(e->bt, e->used);
/* ignore first one, which is this xbt_backtrace_current() */
e->used--;
memmove(backtrace_syms, backtrace_syms + 1, sizeof(char *) * e->used);