[tor-bugs] #32053 [Applications/Tor Browser]: Tor Browser bundles based on Firefox 68 ESR are not reproducible (LLVM optimization issue)

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#32053: Tor Browser bundles based on Firefox 68 ESR are not reproducible (LLVM
optimization issue)
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 Reporter:  gk                                   |          Owner:  gk
     Type:  defect                               |         Status:
                                                 |  assigned
 Priority:  Immediate                            |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Critical                             |     Resolution:
 Keywords:  TorBrowserTeam201911, tbb-9.0-must,  |  Actual Points:
  tbb-9.0-issues, tbb-regression, tbb-9.0.1-can  |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by gk):

 Oh, and we can't easily switch to clang 9 directly (just in case someone
 had this idea) because first of all there seem to be
 [https://bugzilla.mozilla.org/show_bug.cgi?id=1596283 new],
 [https://bugzilla.mozilla.org/show_bug.cgi?id=1596350 additional
 reproducibility issues] that got introduced with clang 9. And furthermore
 our `mingw-clang` cross-build is
 [https://bugzilla.mozilla.org/show_bug.cgi?id=1590624 not ready for clang
 9 yet]. Finally, it's a quite invasive change as it would effect almost
 all of our builds and we'd want a newer Rust version, which is using clang
 9, too, as well.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32053#comment:51>
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