Repository: rust
Issue: thinlto run-pass unit test link errors on OS X (High Sierra 10.13.6)
Labels: A-linkage,O-macos,T-compiler,C-bug

I have been getting errors in our run-pass test suite on OS X for some amount of time. I'm not sure if the problem is in a malconstructed `ld` invocation, or something else.

I'm posted a full transcript of the message from the `x.py test` run below in [this gist](https://gist.github.com/pnkfelix/8d01d8eaa3748a646847b93fc5ef435c), but here is probably the most relevant snippet of that output:

```
error: linking with `cc` failed: exit code: 1
  |
  = note: "cc" "-m64" "-L" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/stage2/lib/rustlib/x86_64-apple-darwin/lib" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.11dinsfm25j7lpyc.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1329kli0ah0e260m.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.133ixqypxn7wz1o0.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.136nl6d4hw5n28j5.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.137av9lascg77nun.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.13mladucca3tu5yp.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.144fd7vd07hgcxth.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.144fd7vd07hgcxth.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.15p1jbcuqwtmc6z9.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.17wx4s8c1vg6fm1c.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.195l647wv7e0399t.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1anzl8n8xydut875.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1asp41fcvkq6heh6.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1crzh4eb9rk3gpt5.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1cwt7uar7mashsjs.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1cwt7uar7mashsjs.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1fv3zoqe0an8tnd1.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1genq0xk28rpyff8.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1ghu8tqlqgendytg.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1hssl9uhtcgmbb26.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1ivu43lqofbb7khb.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1j44fln0amyp7ew0.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1jq4bww9ndj35t7d.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1k5h59phnz8gmkbt.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1l5howcfxb8c0bnp.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1mc3swg7idq9qhil.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1mp7fv9i7zyyoxwr.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1mp7fv9i7zyyoxwr.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1mp7fv9i7zyyoxwr.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1nb70bnwggol4of8.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1ogs1k2x8rhcykru.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1ogs1k2x8rhcykru.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1onqll48mq38irsu.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1opt8i9w78mtc849.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1p6c1ywqev6xfbsh.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1pbmnd3fr37vjqv.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1px1dcphmyl8ly4y.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1sbqca1lrqcmzus3.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1tahgyx5y63hqzn4.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1teoqnbl8vixq0v0.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1txyrxp0koogw7hk.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1u5sabw4z4er7tk4.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1uew3iio0vn0vdkt.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1up221vmg4d8oo9e.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1vgjp35ivgpbyt01.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1vgpq7sdd90t3smz.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1vods0mul5ypk9ai.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1w2azuc8r7te8u14.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1w5g2b9ro2tcwwwj.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1w890836k9n1val4.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1wcntmqg6o6kvyev.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1x3ywlurom8il190.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1x8djs5n5j5w0msf.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1ydu1tnbrdn111zw.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1yit1lao62ukl1b.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1yit1lao62ukl1b.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1z4at8cat3mwyt9n.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.1zxshk5phl9uuxjf.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.2014bw3gs9742u6o.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.21f8t6tw6eat60np.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.22r184dg6fqxiq0l.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.22scjrnt1fawm9y0.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.22scjrnt1fawm9y0.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.22skfdbfhl1o6ad4.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.22skfdbfhl1o6ad4.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.245bh82i5dxmh8un.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.24dlr5qbblagiqbw.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.24o8ipc6y78663ds.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.24o8ipc6y78663ds.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.25setqrdfrvrbeve.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.26uqaeh7k4heqig0.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.26xq21gatn3ko6ef.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.27bkf2sge2lhl7qf.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.27gt2i3xb8z47flz.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.28zwgrwdyg4gonu3.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.290a73ep39awpkys.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.291uq78w1qto0rh1.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.292bljff6aa0lj92.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.2bfs6wsyejut20p7.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.2ce1lfrc8vjkueuo.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.2cu9758ondtvr73s.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.2dtan03jhs3bzy6a.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.2dtan03jhs3bzy6a.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.2dtan03jhs3bzy6a.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.2fk5n68iiusb2o2e.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.2fk5n68iiusb2o2e.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.2fsridnkk8n84ow3.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.2fsridnkk8n84ow3.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.2fwxbjjaaz6acfqf.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.2g95hkgskdkb9n6w.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.2hmm4ydv2gxqun69.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.2jby6bi09hfotcs8.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.2jby6bi09hfotcs8.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.2kld7gwihxo3cjsh.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.2lpv8rz97ntfx18y.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.2lpv8rz97ntfx18y.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.2lpv8rz97ntfx18y.rcgu.o" 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"/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.uozc6tpin9mgkfw.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.uvaxjxm49ruzhse.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.uvaxjxm49ruzhse.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.vq49yth2jl5tdp1.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.vv04s86xsf2i36d.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.wfy8o1llid1li54.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.wfy8o1llid1li54.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.xe0pisygxcurgg2.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.xe0pisygxcurgg2.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.y5ggzt25fds4jt.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.yt3h1s73ov94j67.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.zvp8kr56wi4wxic.rcgu.o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a.zx7mkldnttuzb0v.rcgu.o" "-o" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/a" "-Wl,-dead_strip" "-nodefaultlibs" "-L" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/native/rust-test-helpers" "-L" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/auxiliary" "-L" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/stage2/lib/rustlib/x86_64-apple-darwin/lib" "/var/folders/68/bxt927zn2tnbpj7qf4_4vpk80000gn/T/rustcQkyyRb/libstd-f599b8a2ea5b6d2a.rlib" "/var/folders/68/bxt927zn2tnbpj7qf4_4vpk80000gn/T/rustcQkyyRb/liballoc_jemalloc-2fe6902eecf8412f.rlib" "/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/stage2/lib/rustlib/x86_64-apple-darwin/lib/libcompiler_builtins-b5fd5c997086ce2a.rlib" "-lSystem" "-lresolv" "-lpthread" "-lc" "-lm" "-Wl,-rpath,@loader_path/../../../../stage2/lib/rustlib/x86_64-apple-darwin/lib" "-Wl,-rpath,/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/lib/rustlib/x86_64-apple-darwin/lib"
  = note: ld: warning: directory not found for option '-L/Users/fklock/Dev/Mozilla/rust.git/objdir-dbgopt/build/x86_64-apple-darwin/test/run-pass/thinlto/all-crates/auxiliary'
          Undefined symbols for architecture x86_64:
            "_$LT$$RF$$u27$a$u20$T$u20$as$u20$core..fmt..UpperHex$GT$::fmt::h72b48078143e2674", referenced from:
                std::sys_common::bytestring::debug_fmt_bytestring::h07191042f44f46b0 in a.y5ggzt25fds4jt.rcgu.o
            "_$LT$alloc..vec..Vec$LT$T$GT$$GT$::drain::h8fe4e6bab243df27", referenced from:
                _$LT$std..io..buffered..BufWriter$LT$W$GT$$GT$::flush_buf::hd937ab291f70bb51 in a.es85ml4ueq8jivg.rcgu.o
...
... [snipped ~350 lines of output] ...
...
                _$LT$alloc..sync..Arc$LT$T$GT$$GT$::drop_slow::h78a65b9ea029d9fa in a.1vgjp35ivgpbyt01.rcgu.o
                core::ptr::drop_in_place::hf68ceacf1d345d41 in a.1w5g2b9ro2tcwwwj.rcgu.o
                _$LT$F$u20$as$u20$alloc..boxed..FnBox$LT$A$GT$$GT$::call_box::h3e18d1f71edfb8da in a.1w5g2b9ro2tcwwwj.rcgu.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: aborting due to previous error
```

it is annoying and I don't yet know when it started. I suppose I might attempt to bisect.

But I just wanted to make sure the problem was registered somewhere.

Oh, in case its relevant, here is my current `ld` and `xcode` version info:

```
% ld -v
@(#)PROGRAM:ld  PROJECT:ld64-351.8
configured to support archs: armv6 armv7 armv7s arm64 i386 x86_64 x86_64h armv6m armv7k armv7m armv7em (tvOS)
LTO support using: LLVM version 9.1.0, (clang-902.0.39.2) (static support for 21, runtime is 21)
TAPI support using: Apple TAPI version 9.1.0 (tapi-902.0.9)
```

```
% xcodebuild -version
Xcode 9.4.1
Build version 9F2000
```

(Oh, and also: I am observing this for both stage 1 and stage 2 compilers.)