[tbb-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:
-------------------------------------------------+-------------------------

Comment (by gk):

 Replying to [comment:44 tom]:
 >  - Have you confirmed you don't need the spec thing for
 https://bugzilla.mozilla.org/show_bug.cgi?id=1460801 ?  (If so, I can
 close that bug.)

 I think it worked for me back then a couple of months ago when I worked on
 the toolchain. I'll double-check with nightly builds once things landed
 but am optimistic.

 >  - fxc2 requires the winpthread dll to be in its bin directly IIRC; but
 I don't see where you're copying that. (I might have missed it. If you're
 not getting errors on fxc2 it must be working.)

 I think we don't need it when building with `mingw-w64-clang`. At least
 the build passes and I'd suspect compile time issues if that were a
 problem.

 >  - I see some flags in our mozconfig you don't have:
 >    - https://searchfox.org/mozilla-
 central/rev/325c1a707819602feff736f129cb36055ba6d94f/browser/config/mozconfigs/win32/mingwclang#53-54

 Yes, I am not sure why we don't need those but the build is not breaking,
 so we could leave that investigation for later.

 >  - I'm not sure what you do about PDBs; but it would be good to get a
 bug on file about generating/outputting them. (Perhaps in some
 configuration generating the static clang libraries with debug info also.)

 I agree. Right now don't generate them.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28238#comment:45>
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