Subject: Re: bug#49983: grep-3.6.27-20b4 tests fail on Cygwin

From: Paul Eggert <[email-masked]>
Date: Tue, 10 Aug 2021 23:19:33 -0700

On 8/10/21 4:21 PM, Gary Johnson wrote:
> $ src/grep --file=in in >out
> $ echo $?
> 1
> $ od -t o1 in
> 0000000 360 220 220 205 012
> 0000005
> $ cmp in out
> cmp: EOF on out which is empty

OK, so grep is simply not finding a match.

At this point it's probably time to fire up a debugger and see why 
grep's matchers are saying "no match". That would require some debugging 
expertise and time, though; do you have those available?