[Bug ld/22374] Unnecessary PLT entries

[amodra at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=22374

--- Comment #2 from Alan Modra <amodra at gmail dot com> ---
Thanks HJ.  The powerpc patch I'm testing doesn't need reference counting of
function pointers now that check_relocs is running after gc_sections (and
probably x86 also doesn't need ref counting nowadays).  It's quite a simple
patch, making use of the fact that needs_plt is set on powerpc only when
encountering branch relocs or relocs that explicitly create a plt entry.  So if
needs_plt is not set I can do without a plt entry if there are no dynamic
relocs in read-only sections.

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