[U-Boot] [PATCH] Makefile: remove BUILD_TAG from KBUILD_CFLAGS

[Tom Rini]

On Tue, Feb 09, 2016 at 08:11:15AM -0800, James Chargin wrote:
> 
> 
> On 02/08/2016 05:32 PM, Stephen Warren wrote:
> >From: Stephen Warren <swarren at nvidia.com>
> >
> >If BUILD_TAG is part of KBUILD_CFLAGS, then any time the value changes,
> >all files get rebuilt. In a continuous integration environment, the value
> >will change every build. This wastes time assuming that incremental
> >builds would otherwise occur.
> >
> >To solve this, remove BUILD_TAG from KBUILD_FLAGS and add it to the end of
> >"local version".
> >
> >This has other advantages too:
> >- The special case for BUILD_TAG in display_options.c can be removed.
> >- The version printed by the "version" command exactly matches what is
> >   printed at boot.
> >
> >Old sign-on message:
> >U-Boot 2016.03-rc1-00044-g4085db5e767b (Feb ...), Build: bar-bas
> >
> >New sign-on message:
> >U-Boot 2016.03-rc1-00044-g4085db5e767b-bar-baz (Feb ...)
> 
> I would urge this not be done. The display of the BUILD_TAG on
> startup is pretty useful in my environment. It's been there for a
> long time and some of my users have grown used to it.
> 
> Of all the parts of the sign-on message, I'd rather the git hash go
> away than the BUILD_TAG. None of my users really care about the
> level of detail of the git hash and won't spend the time required to
> use this hash to determine if they have the version they want. (Some
> don't have a repo clone, and don't care to, and so can't easily make
> the correspondence even if they wanted to).

Yeah, I think this is too widely used of a thing to change.  FWIW, I
really like githashes since it means you can see if $random-binary is
something you have in $vendor-tree or not.  So I think in this case, NAK
on the patch and maybe need to poke Travis-CI on how to or not to tag
things?

-- 
Tom
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