[Bug 226973] devel/libtecla: fails to build with lld as the system linker

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226973

            Bug ID: 226973
           Summary: devel/libtecla: fails to build 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: k at stereochro.me
            Blocks: 214864
             Flags: maintainer-feedback?(k at stereochro.me)
                CC: k at stereochro.me

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: error: unable to find library -lcurses
ld: error: unable to find library -lc
---

Known issues in this port or in lld that affect this port:
(2) lld has no built-in search paths (/lib, /usr/lib). Normally the linker is
invoked from the compiler driver, and the search paths are added by the
compiler. If lld is invoked directly library search paths must be specified
explicitly, with -L/lib -L/usr/lib.

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/libtecla-1.6.3.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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