[Bug-gnuzilla] IceCat-38.8.0 does not work on Fedora 24

[Antonio Trande]

Hi all,

currently IceCat-38.8.0 does not work on Fedora 24; we have open a
related bug report:
https://bugzilla.redhat.com/show_bug.cgi?id=1332926

Crash report from GDB:
https://bugzilla.redhat.com/show_bug.cgi?id=1332926#c8

<snip>
0x00007ffff4873bb3 in nsLayoutUtils::GetLastSibling
(aFrame=0xe5e5e5e5e5e5e5e5) at
/usr/src/debug/icecat-38.8.0/layout/base/nsLayoutUtils.cpp:1586
1586      if (!aFrame) {
</snip>

That's the code where the crash happens:
<code>
// static
nsIFrame* nsLayoutUtils::GetLastSibling(nsIFrame* aFrame) {
  if (!aFrame) {
    return nullptr;
  }

  nsIFrame* next;
  while ((next = aFrame->GetNextSibling()) != nullptr) {
    aFrame = next;
  }
  return aFrame;
}
</code>

It looks lke icecat crashes, because it tries to access uninitialised
memory (0xe5e5e5e5e5e5e5e5) and checks the memory against NULL
(!aFrame), that must crash.
But I don't know the cause might be gcc6 related.

Any help is welcome.

-- 
---
Antonio Trande
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