[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)
-------------------------------------------------+-------------------------
 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:
                                                 |  needs_review
 Priority:  Immediate                            |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Critical                             |     Resolution:
 Keywords:  TorBrowserTeam201911R,               |  Actual Points:
  tbb-9.0-must, tbb-9.0-issues, tbb-regression,  |
  tbb-9.0.1-can, GeorgKoppen201911               |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by gk):

 * keywords:
     TorBrowserTeam201911, tbb-9.0-must, tbb-9.0-issues, tbb-regression,
     tbb-9.0.1-can, GeorgKoppen201911
     =>
     TorBrowserTeam201911R, tbb-9.0-must, tbb-9.0-issues, tbb-regression,
     tbb-9.0.1-can, GeorgKoppen201911
 * status:  new => needs_review


Comment:

 Let's test -O1 in our upcoming alpha build to get a feeling whether that
 would be an acceptable workaround or not and to check whether it actually
 resolves our build issues: `bug_32053_workaround`
 (https://gitweb.torproject.org/user/gk/tor-
 browser.git/commit/?h=bug_32053_workaround&id=f1f9fa0286982d1fa486880ad6037e1e7a46457d)
 has a patch for review.

 FWIW: It might have been enough to just patch `toolchain.configure` but
 that would result in different `opt-level` options passed to `rustc` and I
 was not exactly sure what would happen in that case.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32053#comment:32>
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