[Buildroot] [RFCv3 08/15] package/pkg-generic: handle host-xz as an extract dependency

[Yann E. MORIN <yann.morin.1998@free.fr>]

Thomas, All,

On 2017-12-03 10:29 +0100, Thomas Petazzoni spake thusly:
[--SNIP--]
> > > > Currently, filesystems that want to compress with xz all depend on
> > > > host-xz unconditioanlly. Do we want to change that as well, so they only
> > > > depend on it if needed?  
> > > 
> > > I don't understand this part, because filesystems do not depend on
> > > host-xz unconditionally. They only depend on it if xz compression of
> > > the filesystem image is requested. From fs/common.mk:
> > > 
> > > ifeq ($$(BR2_TARGET_ROOTFS_$(2)_XZ),y)
> > > ROOTFS_$(2)_DEPENDENCIES += host-xz
> > > ROOTFS_$(2)_COMPRESS_EXT = .xz
> > > ROOTFS_$(2)_COMPRESS_CMD = xz -9 -C crc32 -c
> > > endif  
[--SNIP--]
> > What I mean is that, probably, we will want to make it:
> > 
> >     ROOTFS_$(2)_DEPENDENCIES += $$(BR2_XZCAT_HOST_DEPENDENCY)
> 
> Yes, I thought about this too. But again, it's a separate issue: the
> filesystem code already depends on host-xz, regardless of whether xz is
> already available on the system.

Yes, sure. I was just merely saying that when you eventually make those
dependencies really when-needed, you should also have a look at the
filesystem stuff. ;-)

Regards,
Yann E. MORIN.

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