Awesome, thanks for confirming Arch still works and posting the
screenshot.

> Also anyone tried to run the binary from bionic, which should be built
with gcc-7 as well?

Yes, Lars and I both tried this. It's rather buried in discussion above
but search for the part where I mention "ignore the dependency" in order
to test the gcc 7 Bionic build on a Xenial system.

> --enable-rust-simd caught eye, what is this all about?

There are Rust bindings for Skia, but the part where it crashes doesn't
use Rust. From your screenshot I think these are likely the key missing
flags: -march=armv7-a -mfloat-abi=hard -mfpu=vfpv3-d16

In the conversation above, those are exactly the flags we suspected from
comparing the Chromium build. Looks like we don't actually need clang,
and we don't need -mthumb

Well, there's still the other startup crash specific to Ubuntu 16.04
packages. Given we don't hit it on the Bionic nor Trusty builds, that
problem is likely specific to gcc 5.4

Now we just need someone with access to change the default build
settings on Launchpad.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to firefox in Ubuntu.
https://bugs.launchpad.net/bugs/1711337

Title:
  Firefox crashes at start on armv7L after 55.0.1 update

Status in Mozilla Firefox:
  Expired
Status in firefox package in Ubuntu:
  Confirmed

Bug description:
  Firefox always crashes when launched after the 55.0.1 update on an
  Orange Pi PC Plus (a single-board computer similar to a Raspberry Pi),
  even in safe mode.

  I did a fresh install of Armbian (a Ubuntu Xenial 16.04 re-spin for
  ARM single-board computer) on a similar board (Orange Pi Plus 2e),
  installed Firefox and experienced the same problem--it won't load
  without crashing.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: firefox 55.0.1+build2-0ubuntu0.16.04.2
  Uname: Linux 3.4.113-sun8i armv7l
  AddonCompatCheckDisabled: False
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.25.
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: armhf
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  jim        1138 F.... pulseaudio
   /dev/snd/controlC0:  jim        1138 F.... pulseaudio
  BuildID: 20170814194718
  Card0.Amixer.info:
   Card hw:0 'audiocodec'/'audiocodec'
     Mixer name : ''
     Components : ''
     Controls      : 12
     Simple ctrls  : 12
  Card1.Amixer.info:
   Card hw:1 'sndhdmi'/'sndhdmi'
     Mixer name : ''
     Components : ''
     Controls      : 1
     Simple ctrls  : 1
  Card1.Amixer.values:
   Simple mixer control 'hdmi audio format Function',0
     Capabilities: enum
     Items: 'null' 'pcm' 'AC3' 'MPEG1' 'MP3' 'MPEG2' 'AAC' 'DTS' 'ATRAC' 
'ONE_BIT_AUDIO' 'DOLBY_DIGITAL_PLUS' 'DTS_HD' 'MAT' 'WMAPRO'
     Item0: 'pcm'
  Channel: Unavailable
  CurrentDesktop: XFCE
  Date: Thu Aug 17 05:37:00 2017
  Extensions: extensions.sqlite corrupt or missing
  ForcedLayersAccel: False
  IncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
  IpRoute:
   default via 192.168.10.1 dev eth0 
   default via 192.168.10.1 dev wlan0  proto static  metric 600 
   169.254.0.0/16 dev eth0  scope link  metric 1000 
   192.168.10.0/24 dev eth0  proto kernel  scope link  src 192.168.10.107 
   192.168.10.0/24 dev wlan0  proto kernel  scope link  src 192.168.10.108  
metric 600
  Locales: extensions.sqlite corrupt or missing
  PciMultimedia:
   
  PciNetwork:
   
  Profiles: Profile0 (Default) - LastVersion=55.0.1/20170814194718
  RfKill:
   0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  Themes: extensions.sqlite corrupt or missing
  UpgradeStatus: No upgrade log present (probably fresh install)

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