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

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

Peter, All,

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.

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

Regards,
Yann E. MORIN.

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