linux-kernel - Re: finding unused header files

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Date:	Fri, 22 Jun 2012 12:31:45 +0100
From:	Pádraig Brady <P@...igBrady.com>
To:	"Robert P. J. Day" <rpjday@...shcourse.ca>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ysato@...rs.sourceforge.jp
Subject: Re: finding unused header files

On 06/22/2012 11:46 AM, Robert P. J. Day wrote:
> 
>   inspired by that last post that located an unused header file under
> arch/h8300, i ran my "find_unused_headers.sh" script on the same
> sub-directory to see what would show up.
> 
>   the script is stupidly conservative and didn't identify that shm.h
> header since *somewhere* in the entire kernel source tree, someone was
> including a file called "shm.h" -- not even for the same architecture.
> like i said, stupidly conservative.
> 
>   but it did find this:
> 
> $ ../s/find_unused_headers.sh arch/h8300
> ===== target_time.h =====
> ./arch/h8300/include/asm/target_time.h
> $
> 
> and i see nothing anywhere in the entire tree that includes a
> target_time.h header under any circumstances.
> 
>   i should probably do another run of these scripts some day, just to
> see what turns up.
> 
> rday
> 

See also:
http://code.google.com/p/include-what-you-use/

It's quite awkward (relies on a llvm/clang source tree for example)
and currently requires human interpretation.

cheers,
Pádraig.
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