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d="scan'208";a="14895952" Date: Thu, 26 Mar 2020 13:42:41 +0000 From: Anthony PERARD To: Jan Beulich Message-ID: <20200326134241.GP4088@perard.uk.xensource.com> References: <6fa81b4d-528d-5c33-50c5-a18396b4383a@suse.com> <2c83b876-6fd8-1315-3b28-b45e877187aa@suse.com> <7147e3a1-b237-7a2b-d623-b364704d0096@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: Subject: Re: [Xen-devel] [PATCH v5 03/10] x86: determine HAVE_AS_* just once X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Stefano Stabellini , Julien Grall , Wei Liu , Andrew Cooper , Ian Jackson , George Dunlap , "xen-devel@lists.xenproject.org" , Roger Pau Monne Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" On Thu, Mar 26, 2020 at 10:50:48AM +0100, Jan Beulich wrote: > On 25.03.2020 22:12, Andrew Cooper wrote: > > All the requisite infrastructure looks to be already present. > > ... there's the one open prereq question of what happens upon > tool chain updates. It's not clear to me if/how kconfig would > get invoked despite none of the recorded dependencies having > changed in such a case. (I'm sure you realize there's no issue > with this when the determination occurs out of a makefile.) We might need one small change for this to happen, it is to add a comment in .config which display the output of `$(CC) --version | head -1`. Simple :-). If the output of `$(CC) --version` changes, kconfig will run again. That would be enough to detect tool chain updates, right? Have a look at "include/config/auto.conf.cmd" to find out how kconfig is forced to run again. I'll prepare a patch. -- Anthony PERARD