linux-kernel - Re: [PATCH] headerdep: a tool for detecting inclusion cycles in header file

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Message-ID: <19f34abd0804260830w1b8654c2yaa9e7432b36b3597@mail.gmail.com>
Date:	Sat, 26 Apr 2008 17:30:46 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"Julia Lawall" <julia@...u.dk>
Cc:	"Adrian Bunk" <bunk@...nel.org>, "Sam Ravnborg" <sam@...nborg.org>,
	"Pekka Enberg" <penberg@...helsinki.fi>,
	linux-kbuild@...r.kernel.org, kernel-janitors@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] headerdep: a tool for detecting inclusion cycles in header file

On 4/26/08, Julia Lawall <julia@...u.dk> wrote:
> On Sat, 26 Apr 2008, Adrian Bunk wrote:
>
>  > On Sat, Apr 26, 2008 at 03:45:54PM +0200, Vegard Nossum wrote:
>  > > Hi Sam,
>  > >
>  > > Maybe something like this could be useful for cleaning up headers (and
>  > > maintaining that cleanliness once it has been achieved). What do you think?
>  > >
>  > > (One thing which might or might not be good is that 'make headerdep' will
>  > >  also compile using CC if they're not already compiled. If this should be
>  > >  fixed, I think you'd know how to do it.)
>  >
>  > This way you only catch problems in the current kernel configuration.
>  >
>  > The only problems are under include/, and you should be able to do this
>  > by parsing all headers and without hooking into the build system.
>
>
> I guess one would still have to consider all of the possible permutations
>  of values of configuration variables, to interpret the #ifdefs that have
>  an impact on what is included?  A quick grep suggests that they are mostly
>  related to  __KERNEL__, so perhaps it would not be too expensive to do.

We don't interpret #defines or #ifdefs or #ifs at all. If we did this,
then the program would detect no cycles (because of the header
guards).

The rationale is that any cycle at all, regardless of any guards that
might exist, is wrong. In my opinion anwyay :-)

Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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