Re: [Qemu-ppc] [Qemu-devel] [PATCH qemu] configure/fdt: Use more strict test for libfdt version

[Daniel P . Berrangé]

On Thu, Nov 15, 2018 at 09:33:08PM +1100, David Gibson wrote:
> On Thu, Nov 15, 2018 at 10:11:12AM +0000, Daniel P. Berrangé wrote:
> > On Thu, Nov 15, 2018 at 02:56:59PM +1100, Alexey Kardashevskiy wrote:
> > > The libfdt installed in the system is preferred to the dtc submodule by
> > > default. The recent libfdt update added a new symbol - fdt_check_full -
> > > and this breaks compile if there is an older libfdt installed in
> > > the system.
> > 
> > Unless I'm missing something, QEMU doesn't use the fdt_check_full symbol,
> > so why would the lack of this symbol cause a compile failure. 
> > 
> > It should be fine if the dtc submodule contains a newer libfdt than the
> > host system. As long as QEMU doesn't actually need any of the APIs in
> > the newer libfdt we should be able to continue using the older system
> > version if it is present.
> > 
> > Could you elaborate on what build problems you are having.
> > 
> > > This changes the test to force ./configure into using newer libfdt.
> > 
> > I'm not convinced we want todo that.
> 
> So I think the point here is that Alexey has some other outstanding
> patches that will use fdt_check_full().  The commit message needs to
> make that clear though.  Or else include this patch in that series.

If they're not merged yet, this patch should be squashed into whichever
of those patches first introduces the need for fdt_check_full(), so that
series remains fully  git bisectable.

Regards,
Daniel
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