[Bug 226993] java/java3d: fails to link with lld as the system linker

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226993

            Bug ID: 226993
           Summary: java/java3d: 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
            Blocks: 214864

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]:
---
install  -m 0644 
/wrkdirs/usr/ports/java/java3d/work/java3d-1.5.2/vecmath/dist/lib/ext/vecmath.jar

/wrkdirs/usr/ports/java/java3d/work/java3d-1.5.2/j3d-core/build/default/opt/lib/ext/j3dcore.jar

/wrkdirs/usr/ports/java/java3d/work/java3d-1.5.2/j3d-core/build/default/opt/lib/ext/j3dutils.jar
 /wrkdirs/usr/ports/java/java3d/work/stage/usr/local/openjdk8/jre/lib/ext
install 
/wrkdirs/usr/ports/java/java3d/work/java3d-1.5.2/j3d-core/build/default/opt/native/libj3dcore-ogl.so
 /wrkdirs/usr/ports/java/java3d/work/stage/usr/local/openjdk8/jre/lib/amd64
install:
/wrkdirs/usr/ports/java/java3d/work/java3d-1.5.2/j3d-core/build/default/opt/native/libj3dcore-ogl.so:
No such file or directory
*** Error code 71
---

More investigation is needed - it is not clear in the log why libj3dcore-ogl.so
failed to build.

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/java3d-1.5.2_5.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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