[Bug 1711337] Re: Firefox crashes at start on armv7L after 55.0.1 update

[Chituc Georgian]

firefox_57.0.4 ubuntu xenial crash like firefox 58 ubuntu xenial , before it reach skia bug 
=> 0xf4cd4790:	strd	r2, r3, [r1]
   0xf4cd4794:	ldr.w	r3, [r9, #4]
   0xf4cd4798:	adds	r3, #123	; 0x7b
   0xf4cd479a:	beq.w	0xf4cd4a34
   0xf4cd479e:	ldr	r1, [r6, #24]


 firefox_57.0.4 ubuntu trusty crash at skia bug 
=> 0xf45d4b32:	20 f2 b1 11			; <UNDEFINED> instruction: 0xf22011b1
   0xf45d4b36:	21 f2 b2 21			; <UNDEFINED> instruction: 0xf22121b2
   0xf45d4b3a:	22 f2 b3 31			; <UNDEFINED> instruction: 0xf22231b3
   0xf45d4b3e:	23 f2 13 ff	bl	0xf47f8968

So firefox build with xenial toolchain have one more crash , mostly
because of different build enviroment from trusty to xenial .

So a solution will be to build firefox with trusty toolchain .

About the cross compile set up , I was happy but to early , it compile fine for 30 minutes then stop compilation because a bug in rustc compiler . 
I most used https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Build_Instructions/Cross-compiling_Mozilla  and set up a xenial chroot . I installed some packages for xenial some for armhf . I uset rustup to install rust that can make target armhf .
But at one point I think it mix the include headers of x86 with the ones from arm .

I think the best is liek you said to set up a arm machine running ubuntu
trusty and use that to compile all . I think that way will work . Using
arm xenial just give one (or more ) crash not just the skia one .

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Title:
  Firefox crashes at start on armv7L after 55.0.1 update

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