[tbb-bugs] #26475 [Applications/Tor Browser]: ESR60-based .dmg images are not built reproducibly with Stylo enabled using rustc > 1.25.0

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#26475: ESR60-based .dmg images are not built reproducibly with Stylo enabled using
rustc > 1.25.0
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 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:
                                                 |  needs_information
 Priority:  Very High                            |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-rbm, GeorgKoppen201808,          |  Actual Points:
  TorBrowserTeam201808                           |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by alexcrichton):

 Hm so if LLVM is compiled exactly the same way that is indeed a little
 worrisome. One other thing we do is that if we're compiling an in-tree
 LLVM we specify the `LLVM_RUSTLLVM` define for C++ code (here -
 https://github.com/rust-
 lang/rust/blob/bf1e461173e3936e4014cc951dfbdd7d9ec9190b/src/bootstrap/compile.rs#L736-L740).
 That's used for a few minor features but none that should touch the
 reproducibility of the build in theory...

 I'm running out of ideas unfortunately :(

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26475#comment:36>
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