[Bug 226994] devel/memleax: fails to link with lld as the system linker

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226994

            Bug ID: 226994
           Summary: devel/memleax: fails to link with lld as the system
                    linker
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: emaste at freebsd.org
                CC: guy.tabrar at me.com
                CC: guy.tabrar at me.com
             Flags: maintainer-feedback?(guy.tabrar at me.com)

I'm working on switching to LLVM's lld linker as the FreeBSD system linker
(/usr/bin/ld)[1], and the port in this PR is reported as a new failure in the
exp-run, PR 214864.

An excerpt from the build log[2]:
---
checking OS and machine type...
on FreeBSD.
checking libraries...
checking libunwind...
libunwind is missing.
Error: libunwind-devel is required.
===>  Script "configure" failed unexpectedly.
---

The configure failure may be due to shared object protected visibility symbol
preemption issues; setting LLD_UNSAFE=yes may be a suitable workaround (to use
ld.bfd).

FreeBSD 11 and later have lld available as /usr/bin/ld.lld, so one simple
option for testing is to just symlink /usr/bin/ld to ld.lld (and restore it to
ld.bfd).

A port Makefile knob, LLD_UNSAFE=yes, exists to indicate that a port does not
work with lld, and requires either /usr/bin/ld.bfd or binutils from ports. This
should work for the common case of ports written in C using GNU autoconf; it
may have no effect on other ports.

[1] https://lists.freebsd.org/pipermail/freebsd-current/2018-March/068985.html
[2]
http://package18.nyi.freebsd.org/data/headamd64PR214864-default/2018-03-21_17h43m11s/logs/errors/memleax-1.0.3.log

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