[snap] chromium is built with NEON on armhf (SIGILL, Illegal instruction)

[Dmitry Osipenko]

Chromium-browser stopped working on NVIDIA Tegra20 devices since the time it was switched to the snap packaging.

# gdb /snap/bin/chromium
...
Thread 11 "chrome" received signal SIGILL, Illegal instruction.
0xb6b4ee9a in std::__1::locale::__imp::__imp(unsigned int) () from target:/snap/chromium/1211/usr/lib/chromium-browser/libffmpeg.so
(gdb) bt
#0 0xb6b4ee9a in std::__1::locale::__imp::__imp(unsigned int) () from target:/snap/chromium/1211/usr/lib/chromium-browser/libffmpeg.so
#1 0xb6b509c8 in std::__1::locale::__global() () from target:/snap/chromium/1211/usr/lib/chromium-browser/libffmpeg.so
#2 0xb6b50a32 in std::__1::locale::locale() () from target:/snap/chromium/1211/usr/lib/chromium-browser/libffmpeg.so
#3 0xb6b3e7d0 in std::__1::basic_streambuf<char, std::__1::char_traits<char> >::basic_streambuf() () from target:/snap/chromium/1211/usr/lib/chromium-browser/libffmpeg.so
#4 0xb6b3ede6 in std::__1::DoIOSInit::DoIOSInit() () from target:/snap/chromium/1211/usr/lib/chromium-browser/libffmpeg.so
#5 0xb6b3f9b2 in _GLOBAL__sub_I_iostream.cpp () from target:/snap/chromium/1211/usr/lib/chromium-browser/libffmpeg.so
#6 0xb6f215c0 in ?? () from target:/lib/ld-linux-armhf.so.3

(gdb) layout asm
│ >0xb6b4ee9a <_ZNSt3__16locale5__impC2Ej+10> vmov.i32 q8, #0 ; 0x00000000
│ 0xb6b4ee9e <_ZNSt3__16locale5__impC2Ej+14> mov r9, r0
│ 0xb6b4eea0 <_ZNSt3__16locale5__impC2Ej+16> add.w r3, r9, #40 ; 0x28

NVIDIA Tegra20 is one of ARMv7 CPUs which do not support NEON instructions, "vmov.i32 q8" is the ARM NEON instruction because q8 is the NEON register. Will be great if the compiler flags could be changed back to what was used for the deb packaging, thanks in advance!

[Olivier Tilloy (osomon)]

Tentative fix: https://git.launchpad.net/~chromium-team/chromium-browser/+git/snap-from-source/commit/?id=65466d5becb5c2ae9bc06a04269093b8e8a5b471

[Olivier Tilloy (osomon)]

The snap is currently being rebuilt for armhf and will be available in the candidate channel within the next two days. I'd appreciate testing and feedback when that happens. Thanks!

[Dmitry Osipenko (digetx)]

Hello, Olivier! Thank you very much! I'll test ASAP!

[Dmitry Osipenko (digetx)]

Hi, Olivier! Today's Chromium-browser from the candidate channel is working great on NVIDIA Tegra20! Thank you for the fix!

[Olivier Tilloy (osomon)]

Excellent, thanks Dmitry for the feedback!