[PATCH] ARM: kbuild: Fix forced rebuild after 'make dtbs'

[Linus Walleij]

On Wed, Nov 26, 2014 at 3:41 PM, Russell King - ARM Linux
<linux at arm.linux.org.uk> wrote:
> On Wed, Nov 26, 2014 at 02:57:42PM +0100, Linus Walleij wrote:
>> make -f Makefile -j5 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-
>> KBUILD_OUTPUT=build-u300 u300_defconfig
>> make -f Makefile -j5 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-
>> KBUILD_OUTPUT=build-u300 zImage CONFIG_DEBUG_SECTION_MISMATCH=y
>> make -f Makefile -j5 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-
>> KBUILD_OUTPUT=build-u300 dtbs
>> make -f Makefile -j5 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-
>> KBUILD_OUTPUT=build-u300 zImage CONFIG_DEBUG_SECTION_MISMATCH=y
>>
>> -> Rebuilds everything.
>>
>> This doesn't occur before the offending commit. So it only happens
>> when specifying extra environment variables on the command line.
>
> I suspect if you also provide the CONFIG_DEBUG_SECTION_MISMATCH=y on the
> dtbs line, everything will work properly.

Yay, it works! :)

> The problem is that dtbs line executes a prepare, which I guess rebuilds
> the bounds stuff.  So, the dtbs target results in it being rebuilt without
> the section mismatch, and then you re-execute a make with it, causing
> the bounds stuff to be rebuilt again.

Yep. Not very intuitive to require passing section mismatch debug
flags to DTB rebuilding but whatever, it's not so bad I can't live with
it.

Strange that it worked before.

Yours,
Linus Walleij