linux-kernel - Re: Linux 2.6.30.2: does not boot

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Message-Id: <20090721101355.c32a0d27.sfr@canb.auug.org.au>
Date:	Tue, 21 Jul 2009 10:13:55 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Damien Wyart <damien.wyart@...e.fr>, Greg KH <gregkh@...e.de>,
	Wolfgang Walter <wolfgang.walter@...m.de>,
	linux-kernel@...r.kernel.org
Subject: Re: Linux 2.6.30.2: does not boot

On Mon, 20 Jul 2009 11:16:17 -0700 (PDT) Linus Torvalds <torvalds@...ux-foundation.org> wrote:
>
> Why? Many distro's use ccache, and so you may actually get a cached object 
> file from a previous compile (with a previous compiler). Now, ccache is 
> pretty good at noticing when things change, and I can well imagine that it 
> also checks the compiler version (in addition to checking the hash of the 
> preprocessed output and build flags etc), but I haven't double-checked.
> 
> So to make doubly sure that you really don't end up using cached object 
> files, you might want to run "ccache -C".

ccache includes, in the hash of the preprocessed file, "the real compilers
size and modification time", so will probably notice an upgrade or
downgrade of the compiler.

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/

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