Re: [Xen-devel] [PATCH 0/2] tools: split xl into a separate directory

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Thu, Feb 23, 2017 at 04:29:46PM +0000, Ian Jackson wrote:
> Wei Liu writes ("Re: [PATCH 0/2] tools: split xl into a separate directory"):
> > On Thu, Feb 23, 2017 at 03:54:02PM +0000, Ian Jackson wrote:
> > > No, this is entirely wrong.  You will end up running make in
> > > tools/libxl twice simultaneously.
> > 
> > Libacpi can be built in different directories by setting ACPI_BUILD_DIR.
> 
> Aha.  So it's built multiple times (presumably with different build
> options, etc).
> 
> > Libxl doesn't have that, yet. We can do that, too. But it might involve
> > quite a bit of fiddling with libxl/Makefile.
> 
> This is not the right approach for libxl.
> 
> Rather the parent Makefile should have a dependency, so that the make
> in `tools' knows to complete libxl before starting xl.
> 

I think this is better.

But I am now very confused how we encode this in our build system.
Obviously there is already such need. Say, all the tools under misc
would require libxc to be built before hand, but the dependency
doesn't seem to be explicitly encoded.

Wei.

> Ian.

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