linux-kernel - Re: Kconfig: '+config' valid syntax?

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Message-ID: <1435829132.2423.10.camel@tiscali.nl>
Date:	Thu, 02 Jul 2015 11:25:32 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Valentin Rothberg <valentinrothberg@...il.com>
Cc:	rafael.j.wysocki@...el.com, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Andreas Ruprecht <andreas.ruprecht@....de>,
	hengelein Stefan <stefan.hengelein@....de>,
	linux@...inikbrodowski.net
Subject: Re: Kconfig: '+config' valid syntax?

On do, 2015-07-02 at 11:01 +0200, Paul Bolle wrote:
> I'm just guessing here. Anyhow, you might start by looking at this
> snippet in zconf.l:
>     .       {
>             unput(yytext[0]);
>             BEGIN(COMMAND);
>     }
> 
> 
>     <COMMAND>{
>             {n}+    {
>                     [...]
>             }
>             .
>             \n      {
>                     BEGIN(INITIAL);
>                     current_file->lineno++;
>                     return T_EOL;
>             }
>     }
> 
> Which perhaps translates to:
> - ignore unknown stuff for now and go in COMMAND state;
> - do something if we encounter some text ({n} = [A-Za-z0-9_]);
> - go in INITIAL state if we encounter newlines or unknown stuff.
> 
> At the end of which we're back where we started before encountering
> the'+'. But there are more references to '.' in the lex rules so it's
> probably more complicated.

All of which is moot after commit 2e0d737fc76f ("kconfig: don't silently
ignore unhandled characters"). That's in linux-next but not (yet) in
v4.1+. It even has my Ack! My memory really must be degrading now...


Paul Bolle
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