[Bug 196354] New: [exp-run] Make libthr.so loadable

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196354

            Bug ID: 196354
           Summary: [exp-run] Make libthr.so loadable
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Ports Framework
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: kib at FreeBSD.org
                CC: portmgr at FreeBSD.org

Created attachment 151071
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=151071&action=edit
dlopenable libthr

I request pre-commit exp-run for the patch which integrates libthr into libc as
plugin, allowing dlopen("libpthread.so") to work instead of breaking the
process which attempted it.  This should be very useful for programs which
allow loadable modules, where modules may be linked with threading library.

I have somewhat low expectation on the detecting breakage from the build-only
tests, but I think this is best we can do anyway.  Patch was extensively tested
by Peter Holm with stress2.

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