Re: [U-Boot] Makefile: Only build dtc if needed

On Tue, Nov 13, 2018 at 03:43:07PM -0700, Simon Glass wrote:

At present U-Boot always builds dtc if CONFIG_OF_CONTROL is defined. This is wasteful when the system already has a suitable version available.

Update the Makefile logic to build dtc only if the version available is too old.

This saves about 3 seconds of CPU time on a clean build for me.

Signed-off-by: Simon Glass sjg@chromium.org Reviewed-by: Marek Vasut marek.vasut@gmail.com

In the case of new enough host dtc this then fails on sandbox_spl, chromebook_minnie and others where we need to build spl/dts/dt-platdata.c with a python import error over lacking _libfdt.