Re: DTC Version and Reproducible Builds

["david@gibson.dropbear.id.au" <david@gibson.dropbear.id.au>]

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On Thu, Sep 19, 2024 at 09:45:04PM +0000, Anthony Ortega wrote:
> David,
> 
> When I say DTC programs, I am referring to: convert-dtsv0, dtc,
> fdtdump, fdtget, fdtoverlay, fdtput

Ok.

> One other thing that wasn't immediately clear to me is if those
> tools are needed on the Linux side or just for U-Boot. In Buildroot
> it seems that U-Boot requires it when using Linux, which puts them
> in the Linux image. That could be another potential path forward.

I don't really understand the question.  They're userspace tools, so
whether you need them in any particular context depends on what you're
doing there.

> I'd be interested in seeing where the versioning logic was copied
> from. Since this seems to be the only package we are using that is
> doing this sort of versioning.

According to commit a657ce8f ("Add DTC release version information.")
it came from the Linux kernel... circa 2007.  The kernel's probably
doing something entirely different nowadays.

> Unfortunately, I don't think our system can be configured to use
> meson without a massive overhaul. In the short term I've applied a
> patch in our build that removes the line that grabs the commit tag
> during build.

That.. seems like a pretty serious limitation, given that more and
more packages are moving away from make.

But, in any case, I wasn't suggesting this as a practical workaround,
but more as a diagnostic.  If it works with meson we can look closer
at what it's doing and maybe duplicate it with make.

> 
> -Anthony
> 
> -----Original Message-----
> From: david@gibson.dropbear.id.au <david@gibson.dropbear.id.au>
> Sent: Tuesday, September 17, 2024 7:49 PM
> To: Anthony Ortega <anthony.ortega@terranorbital.com>
> Cc: devicetree-compiler@vger.kernel.org
> Subject: Re: DTC Version and Reproducible Builds
> 
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-- 
David Gibson (he or they)	| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you, not the other way
				| around.
http://www.ozlabs.org/~dgibson

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