From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christopher Li <sparse@chrisli.org>
Subject: Re: Detect unused header files?
Date: Thu, 30 Jul 2009 03:55:46 -0700
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To: Sam Ravnborg <sam@ravnborg.org>
Cc: "Robert P. J. Day" <rpjday@crashcourse.ca>, sparse <linux-sparse@vger.kernel.org>

Hi Sam,

I create a branch "unused-include-files" for some experiment patch.
Some thing quick and dirty to find out what works and what doesn't.
No where near submitting quality.

http://git.kernel.org/?p=devel/sparse/chrisl/sparse.git;a=shortlog;h=unused-include-files

Currently it just report all unused stream.

for your example foo.h:

#include <linux/types.h>
#include <linux/string.h>

struct foo {
       __u32 bar;
       __u32 baz;
};


$ ./sparse foo.h
unused stream preprocessor(1)
unused stream foo.h(2)
unused stream preprocessor(3)
unused stream /usr/include/linux/stddef.h(6)
unused stream /usr/include/asm/posix_types.h(7)
unused stream /usr/include/asm/types.h(9)
unused stream /usr/include/linux/string.h(11)
unused stream /usr/include/string.h(12)
unused stream /usr/include/features.h(13)
unused stream /usr/include/sys/cdefs.h(14)
unused stream /usr/include/bits/wordsize.h(15)
unused stream /usr/include/gnu/stubs.h(16)
unused stream /usr/include/bits/wordsize.h(17)
unused stream /usr/include/gnu/stubs-32.h(18)
unused stream /usr/lib/gcc/x86_64-redhat-linux/4.3.0//include/stddef.h(19)

Just as I expected. Lost of noise :-)

BTW, use "-vstream" to show the actual symbol usage detail.

Comments?

Chris