[Issue 19801] New: Linking error: ld: symbol(s) not found for architecture x86_64

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19801

          Issue ID: 19801
           Summary: Linking error: ld: symbol(s) not found for
                    architecture x86_64
           Product: D
           Version: D2
          Hardware: x86
                OS: Mac OS X
            Status: NEW
          Severity: blocker
          Priority: P1
         Component: tools
          Assignee: nobody at puremagic.com
          Reporter: jon.kleiser at icloud.com

I try to install the D REPL. After having done "dub fetch drepl" successfully,
I do "dub run drepl". That job ends like this:

drepl 0.2.1: building configuration "console"...
Running pre-build commands...
Linking...
Undefined symbols for architecture x86_64:
  "__D6object__T10RTInfoImplVAmA2i48i60Z4datayG2m", referenced from:
      __D42TypeInfo_S3std7variant__T8VariantNVmi32ZQp6__initZ in
libstdx-allocator.a(concurrency_103_72a.o)
  "__D6object__T10RTInfoImplVAmA2i80i961Z4datayG2m", referenced from:
      __D59TypeInfo_S3std11concurrency__T4ListTSQBbQBa7MessageZQw4Node6__initZ
in libstdx-allocator.a(atomic_ef_466.o)
  "_rt_loadLibrary", referenced from:
      __D4core7runtime7Runtime__T11loadLibraryZQoFxAaZPv in drepl.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Error: linker exited with status 1
/Library/D/dmd/bin/dmd failed with exit code 1.

I have tried with both DMD64 D Compiler v2.085.0 and v2.085.1.
I'm running macOS 10.14.4 (the latest).

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