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xen-devel
Re: [Xen-devel] [PATCH] tools top level makefile cleanup
On Wednesday 23 March 2005 14:48, Anthony Liguori wrote:
> Hollis Blanchard wrote:
> >
> >But I really don't like that for every command to recurse with (e.g.
> > clean), you must add more hackery to the Makefile. Your snippet has the
> > same problem (let's add "clean"...), and it seems all the Makefiles have
> > all the issues discussed in different places.
> >
> >Is there really no better way to solve this problem?
>
> The following works for me. You need a default rule or else make gets
> really confused but the wildcard rule will catch everything else.
>
> SUBDIRS=sub sub1
>
> all:
> @for i in $(SUBDIRS); do \
> $(MAKE) -C $$i $@; \
> done
>
> %:
> @for i in $(SUBDIRS); do \
> $(MAKE) -C $$i $@; \
> done
But the for loop was the original approach, and Adam described two problems
with it:
1. errors in a sub-make will be ignored
2. the sub-makes cannot be parallelized
--
Hollis Blanchard
IBM Linux Technology Center
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