[Bug 226986] lang/myrddin: fails to link with lld as the system linker

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226986

            Bug ID: 226986
           Summary: lang/myrddin: 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: tobik at freebsd.org
          Reporter: emaste at freebsd.org
            Blocks: 214864
          Assignee: tobik at freebsd.org
             Flags: maintainer-feedback?(tobik at freebsd.org)

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]:
---
+ ld -o mbld/mbld /wrkdirs/usr/ports/lang/myrddin/work/mc/rt/_myrrt.o
mbld/deps.o mbld/main.o mbld/util.o mbld/libs.o mbld/syssel.o mbld/config.o
mbld/opts.o mbld/subtest.o mbld/types.o mbld/test.o mbld/install.o mbld/parse.o
mbld/build.o -Llib/thread -lthread -Llib/bio -lbio -Llib/regex -lregex
-Llib/std -lstd -Llib/sys -lsys
ld: error: <internal>: section sh_addralign is not a power of 2
+ true
./mbldwrap.sh: mbld/mbld: not found
Unable to run mbld ; have you build successfully
---

lld is more strict about invalid data in ELF objects.

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/myrddin-0.2.0.log


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214864
[Bug 214864] [exp-run] test build with lld as /usr/bin/ld
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