[Bug 231882] multiple toolchain issues with statically linked binaries

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231882

            Bug ID: 231882
           Summary: multiple toolchain issues with statically linked
                    binaries
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: emaste at freebsd.org
            Blocks: 231027

Attempting to make use of some WIP with statically linked binaries (i386 /
amd64) has uncovered a number of tool chain issues which will be tracked in
this PR.

* elfcopy/strip removes ifunc, probably other relocations

Found by kib@, with userland ifunc stripped statically linked binaries
segfault. strip removed the .rela.plt section header; file content at the
expected relocation site has been zeroed.

See LLVM PR 37538 for an initial part of this issue - lld is writing 0 in
sh_info and sh_link on the .rela.plt section.
https://bugs.llvm.org/show_bug.cgi?id=37538

This likely also affects static PIE.


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231027
[Bug 231027] [META] FreeBSD-Foundation sponsored issues for FreeBSD 13-CURRENT
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