[tor-bugs] #25304 [Applications/Tor Browser]: Update gcc to 6.4.0

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#25304: Update gcc to 6.4.0
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 Reporter:  boklm                                |          Owner:  tbb-
                                                 |  team
     Type:  task                                 |         Status:  new
 Priority:  Very High                            |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-rbm, TorBrowserTeam201802,       |  Actual Points:
  boklm201802                                    |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by cypherpunks):

 Replying to [comment:1 boklm]:
 > After updating gcc to 6.4.0, gcc fails to build with this error:
 > ...
 > The gcc build is fixed when setting `DEB_BUILD_HARDENING_PIE=0` in
 `projects/gcc/build`.
 This is #20301.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25304#comment:2>
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