linux-kernel - Re: libpcre2 breaks COMPILED

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Message-ID: <Y+snZioVyo82mAUj@kroah.com>
Date:   Tue, 14 Feb 2023 07:17:10 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Carlos Llamas <cmllamas@...gle.com>
Cc:     Cristian Ciocaltea <cristian.ciocaltea@...labora.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Jialu Xu <xujialu@...ux.org>, linux-kernel@...r.kernel.org
Subject: Re: libpcre2 breaks COMPILED_SOURCE=1 tags

On Mon, Feb 13, 2023 at 08:07:16PM +0000, Carlos Llamas wrote:
> Newer versions of libpre2 have dropped default support for \K in
> lookarounds. Unfortunately, scripts/tags.sh relies on this option to
> collect all the _compiled_ sources. This is the error:
> 
>   $ make COMPILED_SOURCE=1 tags
>     GEN     tags
>   grep: \K is not allowed in lookarounds (but see PCRE2_EXTRA_ALLOW_LOOKAROUND_BSK)
> 
> It seems there isn't an official maintainer for this script and I can't
> quite understand the regex used for the query. Does anyone have a good
> alternative for this? The regex pattern was introduced in commit
> 4f491bb6ea2a ("scripts/tags.sh: collect compiled source precisely").
> 
> The previous form of all_compiled_sources() seems to work for me and I'm
> guessing it wasn't efficient enough? I can't find much info about the
> switch to find/grep either. I believe the initial thread is this:
> https://lore.kernel.org/all/20200423103801.GA3730892@kroah.com/

Can you send a patch to revert the offending change?  That would be the
simplest for now, right?

thanks,

greg k-h