[tor-bugs] #28238 [Applications/Tor Browser]: Use mingw-w64/clang toolchain to build Firefox

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#28238: Use mingw-w64/clang toolchain to build Firefox
-------------------------------------------------+-------------------------
 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:
                                                 |  needs_review
 Priority:  High                                 |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-rbm, tbb-9.0-must-nightly,       |  Actual Points:
  TorBrowserTeam201908R, GeorgKoppen201908       |
Parent ID:  #30322                               |         Points:
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by gk):

 * keywords:  tbb-rbm, tbb-9.0-must-nightly, TorBrowserTeam201908,
     GeorgKoppen201908 =>
     tbb-rbm, tbb-9.0-must-nightly, TorBrowserTeam201908R,
     GeorgKoppen201908
 * status:  new => needs_review


Comment:

 `bug_28238_v14` (https://gitweb.torproject.org/user/gk/tor-browser-
 build.git/log/?h=bug_28238_v14) has the patches to get this going.
 pospeselr checked that a 64bit build is working, which is nice!

 The patches are on top for those for #28716 to make testing easier. One
 caveat are the 32bit builds wich are currently failing due to memory
 issues when building `gkrust`. I need to find some configure flags that
 help here or we need to bite the bullet of using a 64bit host for 32bit
 builds as well.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28238#comment:40>
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