Re: [Xen-devel] [OSSTEST PATCH] ts-xen-build-prep: Install libelf-dev for benefit of linux.git

[Juergen Gross <jgross@xxxxxxxx>]

On 15/11/17 12:11, Ian Jackson wrote:
> Linux upstream has started needing libelf-dev.  Without it, recent tip
> fails (in our configuration) like this:
> 
>  Makefile:938: *** "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, 
> please install libelf-dev, libelf-devel or elfutils-libelf-devel".  Stop.

The kernel now is using objtool to create unwind information. This needs
libelf to work. Advantage is that this approach no longer depends on
assembler sources being heavily annotated with unwind hints.

> It is not clear exactly when this requirement was introduced.  Our
> bisector said:
>   Bug introduced:  91a6a6cfee8ad34ea4cc10a54c0765edfe437cdb
>   Bug not present: 1c9dbd4615fd751e5e0b99807a3c7c8612e28e20
> but the "introduced" commit is a merge of a large branch, so it's not
> blaming a specific commit.  None of the commits in that range mention
> libelf so the most likely reason is a consequence of a change to some
> configuration interactions (ie, probably, an expansion of the scope of
> an existing dependency).
> 
> CC: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> CC: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> CC: Juergen Gross <jgross@xxxxxxxx>
> CC: Paul Durrant <paul.durrant@xxxxxxxxxx>
> CC: Wei Liu <wei.liu2@xxxxxxxxxx>
> Signed-off-by: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>

Acked-by: Juergen Gross <jgross@xxxxxxxx>


Juergen

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