[Buildroot] [PATCH v2 2/6] zstd: add host libzstd support

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

Peter, All,

On 2018-04-12 20:30 +0200, Peter Seiderer spake thusly:
> On Wed, 11 Apr 2018 23:19:07 +0200, "Yann E. MORIN" <yann.morin.1998@free.fr> wrote:
> > On 2018-04-09 22:04 +0200, Peter Seiderer spake thusly:
> > > Signed-off-by: Peter Seiderer <ps.report@gmx.net>
> > > ---
> > > Changes v1 -> v2:
> > >   - split off host libzstd support (suggested by Yann E. MORIN)
> > >   - no ZSTD_OPTS for host libarary build
> > > ---
> > >  package/zstd/zstd.mk | 12 ++++++++++++
> > >  1 file changed, 12 insertions(+)
> > > 
> > > diff --git a/package/zstd/zstd.mk b/package/zstd/zstd.mk
> > > index c0fa88026c..1b76b0164c 100644
> > > --- a/package/zstd/zstd.mk
> > > +++ b/package/zstd/zstd.mk
> > > @@ -46,4 +46,16 @@ define ZSTD_INSTALL_TARGET_CMDS
> > >  		DESTDIR=$(TARGET_DIR) PREFIX=/usr -C $(@D)/programs install
> > >  endef
> > >  
> > > +# note: no 'HAVE_...' options for host library build only 
> > > +define HOST_ZSTD_BUILD_CMDS
> > > +	$(HOST_MAKE_ENV) $(HOST_CONFIGURE_OPTS) $(MAKE) \
> > > +		-C $(@D) lib
> > > +endef
> > > +
> > > +define HOST_ZSTD_INSTALL_CMDS
> > > +	$(HOST_MAKE_ENV) $(HOST_CONFIGURE_OPTS) $(MAKE) \
> > > +		DESTDIR=$(HOST_DIR) PREFIX=/usr -C $(@D)/lib install
> > > +endef
> > > +
> > >  $(eval $(generic-package))
> > > +$(eval $(host-generic-package))  
> > 
> > The target variant has optional dependencies on zlib, xz, and lz4, which
> > all have host variants.
> 
> The zlibx/xz/lz4 support options apply only to the cmdline tools, not
> to the libzst libary (the only build target for the host variant),
> see the (short) comment about the 'HAVE_...' options...

OK, that was not clear to me. Say so in the commit log, then.

Regards,
Yann E. MORIN.

> > So, if you don;t specify the dependency in the host-zstd, you get a
> > host-zstd that may or may not have support for zlib, xz, or lz4,
> > depending on hether another package a dependency on them.
> > 
> > We don't have spport for optional host dependencies (because there are
> > not config options for those host packages), so I don't see a solution
> > but to always depend on all three. So:
> > 
> >     HOST_ZSTD_DEPENDENCIES = host-lz4 host-xz host-zlib
> 
> So no need for the host library build to depend on (unused) lz4/xz/zlib
> host-builds....
> 
> Regards,
> Peter
> 
> > 
> > Regards,
> > Yann E. MORIN.
> > 
> 

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