[Bug 1527741] Re: oxide-qt 1.11.3-0ubuntu2 FTBFS on armhf due to compiler segfault

[Olivier Tilloy]

I can reproduce the build failure when building a standalone copy of
libvpx (https://chromium.googlesource.com/webm/libvpx/) on a porter box:

$ make
    [CC] vp8/common/treecoder.c.o
vp8/common/treecoder.c: In function 'tree2tok':
vp8/common/treecoder.c:32:9: error: invalid use of array with unspecified bounds
         const vp8_tree_index j = t[i++];
         ^
vp8/common/treecoder.c:32:34: warning: initialization makes integer from pointer without a cast [-Wint-conversion]
         const vp8_tree_index j = t[i++];
                                  ^
vp8/common/treecoder.c: In function 'branch_counts':
vp8/common/treecoder.c:96:13: error: invalid use of array with unspecified bounds
             i = tree[ i + b];
             ^
vp8/common/treecoder.c:96:15: warning: assignment makes integer from pointer without a cast [-Wint-conversion]
             i = tree[ i + b];
               ^
Makefile:152: recipe for target 'vp8/common/treecoder.c.o' failed

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https://bugs.launchpad.net/bugs/1527741

Title:
  oxide-qt 1.11.3-0ubuntu2 FTBFS on armhf due to compiler segfault

Status in gcc-5 package in Ubuntu:
  Fix Released
Status in oxide-qt package in Ubuntu:
  New

Bug description:
  We tried doing a no-change rebuild of oxide-qt 1.11.3-0ubuntu1
  (versioned as 1.11.3-0ubuntu2) and the build failed on armhf only. The
  reason is a compiler segfault:

  In file included from ../../../../third_party/chromium/src/third_party/webrtc/common_audio/signal_processing/downsample_fast_neon.c:13:0:
  /usr/lib/gcc/arm-linux-gnueabihf/5/include/arm_neon.h: In function 'WebRtcSpl_DownsampleFastNeon':
  /usr/lib/gcc/arm-linux-gnueabihf/5/include/arm_neon.h:6831:10: internal compiler error: Segmentation fault
  (...)

  Full log and build link here: https://launchpad.net/ubuntu/+source
  /oxide-qt/1.11.3-0ubuntu2/+build/8458995

  Looks like the previous oxide-qt successfully built version was built
  against gcc 5.2.1 while this time gcc 5.3.1 is used.

  This is critical for us to fix as multiple Ubuntu Touch landings are
  now blocked due to LP: #1527544 - and the no-change rebuild is
  required to fix the broken situation.

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