Houder wrote:

Old version? The version used by Cygwin is based on 3.0. As far as I can
tell, the most recent tarball is 3.1 ?????

Yes, that's the most recent release.

When building grep 3.1 for use with GDB, I suggest turning off optimization. Something like this:

make clean
make CFLAGS='-g3'

I did investigate using gdb and had a hard time getting a useful result
because of the indirection (grep . < fifo).

Try running grep as follows

$ gdb src/grep
...
(gdb) run . < fifo

(gdb) bt
#0  suppressible_error (errnum=22) at /usr/src/debug/grep-3.0-2/src/grep.c:595
...
That stack trace is coming from grep 3.0. Please debug grep 3.1 instead.



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