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SubjectRe: Linux does not boot
On Mon, 20 Jul 2009 11:16:17 -0700 (PDT) Linus Torvalds <> 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.

Stephen Rothwell
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