Re: [Xen-devel] [PATCH 02/13] Config.mk: replace dependency to genpath with actual target

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2014-08-29 at 08:33 +0200, Olaf Hering wrote:
> On Thu, Aug 28, Ian Campbell wrote:
> 
> > It seems that the bug here is that _paths.h is .PHONY then. Without that
> > the use of move-if-changed would prevent the output file changing
> > unnecessarily and make would not bother to rebuild the dependents.
> 
> It has to be checked every time to catch possible changes in the
> variables. How would that be checked without a .PHONY target, $(1) in
> this case?

Sounds like we need something similar to the FORCE target used by both
the xen subtree and Linux etc. See xen/Rules.mk.

Ian.





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