[Bug 217189] emulators/qemu-user-static: lld 4.0 crashes emulator but works fine on ThunderX

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217189

            Bug ID: 217189
           Summary: emulators/qemu-user-static: lld 4.0 crashes emulator
                    but works fine on ThunderX
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: needs-patch
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: sbruno at FreeBSD.org
          Reporter: jbeich at FreeBSD.org
            Blocks: 216008
             Flags: maintainer-feedback?(sbruno at FreeBSD.org)
          Assignee: sbruno at FreeBSD.org

Soon /head is going to upgrade lld to 4.0 which no longer works, so poudriere
is blocked by ports-mgmt/pkg failing to build. Downgrading to lld to 3.9 or
using GNU binutils appears to help. I can reproduce on 11.0 aarch64 + lld 4.0
on qemu-user-static but not on ref12-aarch64.

# projects/clang400-import branch
$ echo 'int main() {}' >a.c
$ cc a.c
/usr/ports/emulators/qemu-user-static/work/qemu-bsd-user-506a08c/tcg/tcg.c:2017:
tcg fatal error
cc: error: unable to execute command: Abort trap
cc: error: linker command failed due to signal (use -v to see invocation)

# On earlier releases
$ pkg install llvm40
$ clang40 -fuse-ld=lld a.c
/usr/ports/emulators/qemu-user-static/work/qemu-bsd-user-506a08c/tcg/tcg.c:2017:
tcg fatal error
clang-4.0: error: unable to execute command: Abort trap


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216008
[Bug 216008] [exp-run] Update llvm/clang/compiler-rt/libc++/lld/lldb in base to
4.0.0
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