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This patch rewrites the rather obscure can_add_to_stub_group, fixing a problem with the handling of sections containing conditional external branches. When a section group contains any such section, the group size needs to be limited to a much smaller size than groups with only non-conditional external branches. PR 20523 * powerpc.cc (class Stub_control): Add has14_. Comment owner_. (Stub_control::can_add_to_stub_group): Correct grouping of sections containing 14-bit external branches. When returning false, set state_ to reflect the fact that we have one section for the next group. Rewrite most of function for clarity. Add and expand comments. (Target_powerpc::do_relax): Print stub group size retry in hex.
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