linux-kernel - Re: sparse on scripts/kconfig/*.c

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Date:   Wed, 10 May 2017 00:28:33 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        linux-kbuild <linux-kbuild@...r.kernel.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: sparse on scripts/kconfig/*.c

On Tue, May 09, 2017 at 05:27:01PM -0700, Randy Dunlap wrote:
> On 05/09/17 13:17, Christoph Hellwig wrote:
> > On Tue, May 09, 2017 at 09:47:41AM -0700, Randy Dunlap wrote:
> >> Hi,
> >>
> >> I've been attempting to run sparse on the kconfig/ C files -- without success.
> >>
> >> The kbuild files don't try to support CHECK in scripts/kconfig/ AFAICT,
> >> and just running sparse on the C files has issues with not being able to
> >> find header files.
> >>
> >> Has anyone done this?  Any clues about how to do it?
> > 
> > As a wild guess from using sparse on various userspace projects:
> > 
> > have you tried simply setting HOSTCC to cgcc?
> 
> I don't quite see what that has to do with running sparse ($CHECK, not $HOSTCC).

cgcc is a gcc wrappr that calls sparse.  I just trie quickly to patch
Makefile to run cgcc instead of gcc as HOSTCC an it seems to work:

  HOSTCC  scripts/basic/fixdep
scripts/basic/fixdep.c:117:5: warning: symbol 'insert_extra_deps' was not declared. Should it be static?
scripts/basic/fixdep.c:118:6: warning: symbol 'target' was not declared. Should it be static?
scripts/basic/fixdep.c:119:6: warning: symbol 'depfile' was not declared. Should it be static?
scripts/basic/fixdep.c:120:6: warning: symbol 'cmdline' was not declared. Should it be static?

But then I run into the known cgcc bug that it also calls sparse when
called for linking.  Which reminds me that I need to go back and fix
that.