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Date:	Fri, 12 Jul 2019 12:47:59 +0200
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From:	Houder <houder AT xs4all DOT nl>
Reply-To:	cygwin AT cygwin DOT com
To:	cygwin AT cygwin DOT com
Subject:	Re: Possible issue with gawk 5.0.1-1: Getting new warnings
References:	<CAGtwZuYLXDHFiAHGVYw8s+jqt0bNtGMpy+6fOSiqjZddazXZew AT mail DOT gmail DOT com>
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User-Agent:	mua.awk 0.99

Hi,

Apparently Corinna V. (the maintainer of gawk) is not available at the moment.

On Thu, 11 Jul 2019 11:51:09, Vipul P  wrote:
> Hello,
> 
> Here is a sample script to invoke awk:
> 
> $ cat ./gawk_error.sh
> #!/bin/sh
> echo "This:is:a:colon:separated:line:%%%:" | awk '{
>   gsub("\\%", "%25", $0);
>   gsub("\\:", "%3A", $0);
>   print
>   }'

?????

gsub(regexp, replacement[, target])

echo "This:is:a:colon:separated:line:%%%:" | awk '{
  gsub(/%/, "%25");
  gsub(/:/, "%3A");
  print
  }'

> ----
> 
> If I invoke it with gawk 5.0.1-1, I see warnings as below:
> 
> $ uname -a
> CYGWIN_NT-10.0 MyPC 3.0.7(0.338/5/3) 2019-04-30 18:08 x86_64 Cygwin
> 
> $ awk -V
> GNU Awk 5.0.1, API: 2.0 (GNU MPFR 4.0.2, GNU MP 6.1.2)
> Copyright (C) 1989, 1991-2019 Free Software Foundation.
> ...
> 
> $ ./gawk_error.sh
> awk: cmd. line:2: (FILENAME=- FNR=1) warning: regexp escape sequence `\%'
> is not a known regexp operator
> awk: cmd. line:3: (FILENAME=- FNR=1) warning: regexp escape sequence `\:'
> is not a known regexp operator
> This%3Ais%3Aa%3Acolon%3Aseparated%3Aline%3A%25%25%25%3A

I am not surprised to see these specific warnings ...

See 3.2 (esacpe sequences) of GAWK: Effective AWK programming.

> -----
> This script runs without any warnings with older versions of gawk:
[snip]

    https://cygwin.com/ml/cygwin/2019-04/msg00095.html
    ( [ANNOUNCEMENT] gawk 5.0.0-1 )

Item 3

> ----
> 
> The script runs without any warnings on Linux and other Unix variants.

Using version 5 of gawk?

> 
> Is this a regression in gawk 5.0.1-1 on Cygwin ?

Not very likely, as Corinna V. uses the tarball provided by Arnold R.

Regards,
Henri


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