Re: running "make dtbs" for test builds

From: Arnd Bergmann
Date: Mon Jul 18 2016 - 08:53:12 EST

On Monday, July 18, 2016 8:41:22 PM CEST Fengguang Wu wrote:
> Hi Arnd,
> On Mon, Jul 18, 2016 at 02:01:17PM +0200, Arnd Bergmann wrote:
> >Hi Fengguang,
> >
> >I've recently run into a number of cases in which I pulled a branch that
> >was building fine with "make vmlinux", but that failed for "make dtbs",
> >and I wonder if this is something that could be checked by the kbuild
> >test robot so we catch it earlier.
> We initially run "make" without vmlinux, however during bisect more
> specific make targets will be used to speed it up. To do that it's
> necessary to know the regex patterns of "make dtbs" error messages,
> so that they can be correctly bisected.
> Can you give some "make dtbs" error messages or patterns?

A typical error looks like

Error: arch/arm/boot/dts/sun7i-a20-bananapi-m1-plus.dts:252.1-18 Label or path usb_power_supply not found
FATAL ERROR: Syntax error parsing input tree
scripts/Makefile.lib:312: recipe for target 'arch/arm/boot/dts/sun7i-a20-bananapi-m1-plus.dtb' failed
make[3]: *** [arch/arm/boot/dts/sun7i-a20-bananapi-m1-plus.dtb] Error 1

There should be almost 100% correlation between seeing "arch/${ARCH}/boot/dts/"
in stderr and having a problem in the "make dtbs" stage.