linux-kernel - Re: Many unexpected warnings with current sparse

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Date:   Wed, 2 Oct 2019 02:19:00 +0200
From:   Luc Van Oostenryck <luc.vanoostenryck@...il.com>
To:     Steve French <smfrench@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, linux-sparse@...r.kernel.org
Subject: Re: Many unexpected warnings with current sparse

On Tue, Oct 01, 2019 at 06:14:23PM -0500, Steve French wrote:
> It may be related to the following sparse make warning:
> 
> No rule to make target
> '/usr/include/x86_64-linux-gnu/bits/huge_val.h', needed by
> 'sparse-llvm.o'
> 
> I don't see huge_val.h in the Ubuntu 19 version of libc6-dev

Yes, I've been bitten myself by this. It's fixed since a little while.
So, just doing a clean build or removing all the deps (.*.d)
should allow you to build sparse.

I've verified the problem with asm and __inline in quota.h:
it's autodetected by kconfig (CC_HAS_ASM_INLINE) so the exact config
doesn't matter (only gcc's version does) but in all cases recent
versions of sparse don't have a problem with it (an upstream version
of `sparse --version` should return "v0.6.1-rc1-37-gd466a0281").

Best regards,
-- Luc