cat > a.c <<EOF
extern int foo (void);
int
main (void)
{
  return foo ();
}
EOF
gcc -fpie -pie --unresolved-symbols=ignore-all a.c -o a
segfaults in the linker on
              /* Since there's no PLT entry, Validate that this is
                 locally defined.  */
              BFD_ASSERT (undef_weak_ref || sym_sec->output_section != NULL);

(sym_sec is apparently NULL).