Bug#886736: diffoscope: mach-o disassembly with otool can fail in a way that fools diffoscope into dumping raw data instead

[Mike Hommey]

On Wed, Jan 10, 2018 at 10:42:33AM +0900, Mike Hommey wrote:
> On Wed, Jan 10, 2018 at 10:23:59AM +0900, Mike Hommey wrote:
> > On Tue, Jan 09, 2018 at 01:07:58PM +0000, Chris Lamb wrote:
> > > Hi Mike,
> > > 
> > > > I only have a very large XUL library... you probably don't want that.
> > > 
> > > Probably not for the testsuite (!) but if you could make it available it
> > > would help with a fix anyway...
> > 
> > The two builds I was comparing:
> > https://queue.taskcluster.net/v1/task/AKmfRsZPQjqkc7ZoBmS2zw/runs/0/artifacts/public/build/target.dmg
> > https://queue.taskcluster.net/v1/task/Hs2lbc9dTFi4eXjwwM26NA/runs/0/artifacts/public/build/target.dmg
> > 
> > The corresponding diff:
> > https://queue.taskcluster.net/v1/task/QRazQl4PQZeuiU81C9PtlA/runs/0/artifacts/public/diff.html
> > 
> > Note that the actual diff you get is:
> > https://queue.taskcluster.net/v1/task/Uhv3G5XUQA6DDFrOhErA9Q/runs/0/artifacts/public/diff.html
> > 
> > which has more differences. Stripping the binaries first gets the first
> > diff. I should probably file another bug about that, those differences
> > show up when comparing nm -a output.
> 
> BTW, since I'm also looking at where those differences are coming from,
> the first one in the first diff is a UUID difference that appears in the
> otool -l output.

And some (all?) differences that are not in the disassembly differences
are visible in `dyldinfo -bind -weak_bind -lazy_bind` output.

Mike