linux-kernel - Re: [PATCH 0/5] RFC: strip 15,000 lines from a typical autoconf.h

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Date:	Wed, 11 Apr 2012 18:45:38 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Paul Gortmaker <paul.gortmaker@...driver.com>,
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
	davem@...emloft.net, tony@...eyournoodle.com, mmarek@...e.cz,
	lacombar@...il.com
Subject: Re: [PATCH 0/5] RFC: strip 15,000 lines from a typical autoconf.h

On Wed, 11 Apr 2012 18:19:58 -0700 Linus Torvalds <torvalds@...ux-foundation.org> wrote:

>    #define IS_DEFINED(x) (__stringify(CONFIG_##x)[0]=='1')
> 
> That really is a piece of art. I'm expecting that the Guggenheim will
> contact me any moment now about it.

Several weeks ago I asked the assemblage if anyone could think of a way
of doing this.  It seems that I failed to Cc sufficiently perverted
parties.

> Of course, the above does *not* work for a pre-processor, but hey, you
> can't have everything.  It literally is *only* valid in C code. You
> can't have everything. 

So we shouldn't call it IS_DEFINED() - that would cause confusion with
the old version.
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