[U-Boot] [PATCH] buildman: allow more incremental building

[Tom Rini]

On Mon, Mar 28, 2016 at 04:39:35PM -0600, Stephen Warren wrote:

> From: Stephen Warren <swarren at nvidia.com>
> 
> One use-case for buildman is to continually run it interactively after
> each small step in a large refactoring operation. This gives more
> immediate feedback than making a number of commits and then going back and
> testing them. For this to work well, buildman needs to be extremely fast.
> At present, a couple issues prevent it being as fast as it could be:
> 
> 1) Each time buildman runs "make %_defconfig", it runs "make mrproper"
> first. This throws away all previous build results, requiring a
> from-scratch build. Optionally avoiding this would speed up the build, at
> the cost of potentially causing or missing some build issues.
> 
> 2) A build tree is created per thread rather than per board. When a thread
> switches between building different boards, this often causes many files
> to be rebuilt due to changing config options. Using a separate build tree
> for each board would avoid this. This does put more strain on the system's
> disk cache, but it is worth it on my system at least.
> 
> This commit adds two command-line options to implement the changes
> described above; -I ("--incremental") turns of "make mrproper" and -P
> ("--per-board-out-dir") creats a build directory per board rather than per
> thread.
> 
> Tested:
> 
>     ./tools/buildman/buildman.py tegra
>     ./tools/buildman/buildman.py -I -P tegra
>     ./tools/buildman/buildman.py -b tegra_dev tegra
>     ./tools/buildman/buildman.py -b tegra_dev -I -P tegra
> 
> ... each once after deleting the buildman result/work directory, and once
> "incrementally" after a previous identical invocation.
> 
> Signed-off-by: Stephen Warren <swarren at nvidia.com>

Reviewed-by: Tom Rini <trini at konsulko.com>

-- 
Tom
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