https://sourceware.org/bugzilla/show_bug.cgi?id=21677
--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to H.J. Lu from comment #3)
> (In reply to Doug from comment #1)
> > Some additional detail:
> >
> > This behaviour appears only while linking executables with
> >
> > gcc -Wl,--gc-sections
> >
> > against .a archives that contain object code compiled with
> >
> > gcc -ffunction-sections -fdata-sections
>
> Did you see the improvement on ALL targets or just x86 targets?
> This commit:
>
> commit d968975277ba280372002800c6c25bb1b29f496e
> Author: H.J. Lu <hjl.to...@gmail.com>
> Date: Wed Apr 20 05:26:37 2016 -0700
>
> Check ELF relocs after opening all input files
>
> Delaying checking ELF relocations until opening all input files so
> that symbol information is final when relocations are checked. This
> is only enabled for x86 targets.
>
> improved --gc-sections performance, but only on x86.
Also this patch:
commit fbf05aa70d7a6ad3dd92ca718faa4bb383b975ee
Author: H.J. Lu <hjl.to...@gmail.com>
Date: Wed Apr 20 17:06:58 2016 -0700
Move ELF relocation check after lang_gc_sections
Move ELF relocation check after lang_gc_sections so that all the
reference counting code for plt and got relocs can be removed. This
only affects ELF targets which check relocations after opening all
input file.
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