[Bug 217753] lld [llvm 4.0.0] Linker won't link on aarch64 (Error: Failed to open a.out)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217753

            Bug ID: 217753
           Summary: lld [llvm 4.0.0] Linker won't link on aarch64 (Error:
                    Failed to open a.out)
           Product: Base System
           Version: CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: arm
          Assignee: freebsd-arm at FreeBSD.org
          Reporter: wolfgang.meyer at hob.de
                CC: freebsd-toolchain at FreeBSD.org

Created attachment 180774
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=180774&action=edit
Output for verbose compilation/linking (cc -v -Wl,--verbose conftest.c)

When trying to compile C sources on 12-CURRENT (aarch64) with the newly
integrated LLVM 4.0 toolchain the compilation fails with ld giving an error on
failing to open the executable file to be produced by the compilation. An empty
file with the executable name and a .tmpXXXXXXX suffix is produced by the
linking process.

This has been observed using poudriere jails with a FreeBSD 12-CURRENT for
aarch64 after integration of the llvm 4.0 toolchain (tested with base r314564
and base r315016) running on an amd64 host using qemu-user-static for arm64
execution.

How to reproduce:
Build poudriere jail for HEAD and aarch64 architecture.
Enter jail and try to compile typical configure test source (referred to as
conftest.c):

  int main()
  {
    ;
    return 0;
  }

Compilation:
>cc conftest.c
Output:
/usr/bin/ld: error: failed to open a.out: Unknown error -1
cc: error: linker command failed with exit code 1 (use -v to see invocation)

An empty a.out.tmpXXXXXXX is produced.

This happens with qemu-aarch64-static 2.6.90.g20160728_1 ( ports r424575 ).
With qemu-aarch64-static 2.8.50.g20170307 ( ports r435636 ) I get a qemu error:
/usr/ports/emulators/qemu-user-static/work/qemu-bsd-user-c0989c8/tcg/tcg.c:2017:
tcg fatal error
cc: error: unable to execute command: Abort trap (core dumped)
cc: error: linker command failed due to signal (use -v to see invocation)

Using lld 3.9.0 on aarch64 poudriere jails works fine with either qemu-emulated
execution.

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