[Buildroot] [PATCH] linux: kconfig needs the toolchain

[Thomas Petazzoni <thomas.petazzoni@bootlin.com>]

Hello,

On Wed, 1 Aug 2018 00:21:18 +0200, Arnout Vandecappelle wrote:

> > Like is done in the kconfig-package infra for the dependency on
> > $(1)-patch, we use an order-only prerequisites on the toolchain,
> > to guarantee the compiler is available before we can display the
> > kconfig of the kernel.  
>  You actually want to say here why an order-only dependency and not a normal
> dependency: "Since 'toolchain' is a phony target and therefore always out of
> date, a normal dependency would cause the .config target to be rebuilt on each
> invocation of make."

When looking at the patch, my initial reaction was: why is the
dependency on the .config file, rather than on the
-menuconfig/-xconfig/-nconfig/... targets. Those are phony targets, so
a normal dependency would work.

This could even be pushed one level up to the pkg-kconfig
infrastructure, as we're pretty likely to see other packages go down
this route in the future maybe ? Of course, it should be optional.

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com