touch-packages team mailing list archive

[Timo Jyrinki <timo.jyrinki@xxxxxxxxxxxxx>]

With some more building, it seems compiling qtbase with GCC5 does not
help in enabling the upstream (now default in Qt 5.5 & 5.4.2) patches,
bringing back the -Bsymbolic for armhf and using the -reduce-relocations
option. The symptoms are similar with this qtbase compiled with GCC5.
I've saved the compilation at https://launchpad.net/~timo-
jyrinki/+archive/ubuntu/qt-reduce-relocations and attaching unity8.log
(with "Cannot assign object to list").


** Attachment added: "unity8.log"
   https://bugs.launchpad.net/ubuntu/+source/unity8/+bug/1403758/+attachment/4406467/+files/unity8.log

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https://bugs.launchpad.net/bugs/1403758

Title:
  Unity8 shows black screen with Qt 5.4.0

Status in binutils package in Ubuntu:
  New
Status in gcc-defaults package in Ubuntu:
  New
Status in qtbase-opensource-src package in Ubuntu:
  Fix Released
Status in ubuntu-ui-toolkit package in Ubuntu:
  Invalid
Status in unity8 package in Ubuntu:
  Fix Released

Bug description:
  With bug #1403511 taken care of in Qt, apps do not anymore crash with
  Qt 5.4 and device does not anymore go into reboot loop. However,
  nothing is visible on the screen.

  It seems unity8, unity8-dash etc are all running. unity8.log attached

  05/2015 status:
  - We require at least -fPIE on arm for QObject::connect to work, but on the other hand -fPIC armhf is broken like described in this bug
  - Upstream is moving to require -fPIC while banning -fPIE, which means we should move to -fPIC too and use -reduce-relocations (requires -fPIC from now on) on all archs

  Relevant upstream links referring GCC5 as the reason to require -fPIC:
  http://code.qt.io/cgit/qt/qtbase.git/commit/?id=36d6eb721e7d5997ade75e289d4088dc48678d0d
  http://code.qt.io/cgit/qt/qtbase.git/commit/?id=3eca75de67b3fd2c890715b30c7899cebc096fe9

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