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From:	"Soegtrop, Michael" <michael DOT soegtrop AT intel DOT com>
To:	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject:	CR-LF handling behavior of SED changed recently - this breaks a lot of MinGW cross build scripts
Date:	Wed, 7 Jun 2017 16:23:39 +0000
Message-ID:	<0F7D3B1B3C4B894D824F5B822E3E5A175B2636E4@IRSMSX103.ger.corp.intel.com>
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Dear Cygwin Team,

in the latest version of cygwin with sed-4.4-1.tar.bz2 the behavior of sed regarding handling CR-LF sequences changed. The last version I tried where this was still working is sed-4.2.2-3.tar.bz2.

I would say that the documented behavior in both versions is that they replace CR-LF with LF, because both version have a documented option -b to switch of this behavior. But in version 4.4-1 this doesn't work anymore. This breaks a lot of build scripts, because var=$( prog | sed .) now usually adds a carriage return to the variable in case the called prog is a MinGW program - a common scenario in MinGW cross development.

Is this considered a bug in sed 4.4-1 or is the old behavior and the -b option considered deprecated and it was just forgotten to remove the documentation for the -b option?

Best regards,

Michael

Old behavior (sed 4.2.2-3):

$ echo -e "a\r\nb\r\nc\r" | sed 's/a//' | hexdump -C
+ echo -e 'a\r\nb\r\nc\r'
+ sed s/a//
+ hexdump -C
00000000  0a 62 0a 63 0a                                    |.b.c.|
00000005

New behavior (sed 4.4-1):

$ echo -e "a\r\nb\r\nc\r" | sed 's/a//' | hexdump -C
+ echo -e 'a\r\nb\r\nc\r'
+ sed s/a//
+ hexdump -C
00000000  0d 0a 62 0d 0a 63 0d 0a                           |..b..c..|
00000008
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