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Date: Wed, 11 Apr 2012 18:45:38 -0700
From: Andrew Morton <akpm@linux-foundation.org>
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Cc: Paul Gortmaker <paul.gortmaker@windriver.com>, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, davem@davemloft.net, tony@bakeyournoodle.com, mmarek@suse.cz, lacombar@gmail.com

On Wed, 11 Apr 2012 18:19:58 -0700 Linus Torvalds <torvalds@linux-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.