linux - Does awk CR LF handling break on cygwin?

Question

On Linux, this runs as expected:

$ echo -e "line1
line2"|awk -v RS="
" '/^line/ {print "awk: "$0}'
awk: line1
awk: line2

But under windows the is dropped (awk considers this one line):

Windows:

$ echo -e "line1
line2"|awk -v RS="
" '/^line/ {print "awk: "$0}'
awk: line1
line2

Windows GNU Awk 4.0.1 Linux GNU Awk 3.1.8

EDIT from @EdMorton (sorry if this is an unwanted addition but I think maybe it helps demonstrate the issue):

Consider this RS setting and input (on cygwin):

$ awk 'BEGIN{printf ""%s"
", RS}' | cat -v
"
"
$ echo -e "line1
line2" | cat -v
line1^M
line2

This is Solaris with gawk:

$ echo -e "line1
line2" | awk '1' | cat -v   
line1^M
line2

and this is cygwin with gawk:

$ echo -e "line1
line2" | awk '1' | cat -v
line1
line2

RS was just it's default newline so where did the control-M go in cygwin?

Answer 1

I just checked with Arnold Robbins (the provider of gawk) and the answer is that it's something done by the C libraries and to stop it happening you should set the awk BINMODE variable to 3:

$ echo -e "line1
line2" | awk '1' | cat -v
line1
line2

$ echo -e "line1
line2" | awk -v BINMODE=3 '1' | cat -v
line1^M
line2

See the man page for more info if interested.