Re: grep-3.8.11-908f on AIX 7.2

[Paul Eggert]

Thanks for looking into this. I got access to an AIX 7.2 host and agree 
with your diagnosis of a likely compiler bug (wrong code generated) in 
xlclang. To work around the bug I patched Gnulib and this patch should 
appear in the next grep release. I also removed the duplicate tests you 
noted.

As you mentioned, some of the tests still fail with AIX xlclang 16.1; 
I'll see if I can spring some time to look at them too, though I fear 
they may involve another compiler bug.

xlclang says it's based on Clang 4.0.1 which is five years old, and we 
can tell builders to just use plain xlc, so this sort of thing shouldn't 
be a showstopper.