[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 2017-12-01 21:53 +0100, Thomas Petazzoni spake thusly:
> This moves the host-xz dependency handling from
> DEPENDENCY_HOST_PREREQ to an extract dependency.
> 
> To achieve that, check-host-xz.mk fills in the
> BR2_XZ_HOST_DEPENDENCY with host-tar if building a host-tar is
> needed. The name BR2_XZ_HOST_DEPENDENCY has been chosen because it
> matches the name BR2_CMAKE_HOST_DEPENDENCY already used in
> check-host-cmake.mk.
> 
> The BR2_XZ_HOST_DEPENDENCY is added to all packages, except:
> 
>  - host-xz, because we would otherwise depend on ourself.
> 
>  - host-tar, because xz itself is delivered as a tarball, so we need
>    to have host-xz depend on host-tar, and not host-tar depend on
>    host-xz
> 
>  - host-skeleton, because we need to have host-xz depend on
>    host-skeleton, and not the opposite.
> 
> In addition, we modify xz.mk to explicitly build host-xz without
> ccache. We generally took the approach of building host-ccache *after*
> all the extractors have been built.
> 
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> ---
> Changes since v2:
>  - New patch
> ---
>  package/pkg-generic.mk                   | 4 ++++
>  package/xz/xz.mk                         | 5 +++++
>  support/dependencies/check-host-xzcat.mk | 2 +-
>  3 files changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/package/pkg-generic.mk b/package/pkg-generic.mk
> index 86dd2561d4..dfd4719d29 100644
> --- a/package/pkg-generic.mk
> +++ b/package/pkg-generic.mk
> @@ -591,6 +591,10 @@ ifeq ($(filter host-tar host-skeleton,$(1)),)
>  $(2)_EXTRACT_DEPENDENCIES += $(BR2_TAR_HOST_DEPENDENCY)
>  endif
>  
> +ifeq ($(filter host-tar host-skeleton host-xz,$(1)),)
> +$(2)_EXTRACT_DEPENDENCIES += $(BR2_XZCAT_HOST_DEPENDENCY)
> +endif

So, all packages will now depend on this, even those that are not
compressed with xz?

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?

Regards,
Yann E. MORIN.

>  # Eliminate duplicates in dependencies
>  $(2)_FINAL_DEPENDENCIES = $$(sort $$($(2)_DEPENDENCIES))
>  $(2)_FINAL_EXTRACT_DEPENDENCIES = $$(sort $$($(2)_EXTRACT_DEPENDENCIES))
> diff --git a/package/xz/xz.mk b/package/xz/xz.mk
> index e8116f24ae..bcdac13ee3 100644
> --- a/package/xz/xz.mk
> +++ b/package/xz/xz.mk
> @@ -18,5 +18,10 @@ else
>  XZ_CONF_OPTS = --disable-threads
>  endif
>  
> +# we are built before ccache
> +HOST_XZ_CONF_ENV = \
> +	CC="$(HOSTCC_NOCCACHE)" \
> +	CXX="$(HOSTCXX_NOCCACHE)"
> +
>  $(eval $(autotools-package))
>  $(eval $(host-autotools-package))
> diff --git a/support/dependencies/check-host-xzcat.mk b/support/dependencies/check-host-xzcat.mk
> index 9be75c7311..e5d72f95dd 100644
> --- a/support/dependencies/check-host-xzcat.mk
> +++ b/support/dependencies/check-host-xzcat.mk
> @@ -2,7 +2,7 @@
>  # If it is not present, build our own host-xzcat
>  
>  ifeq (,$(call suitable-host-package,xzcat,$(XZCAT)))
> -DEPENDENCIES_HOST_PREREQ += host-xz
> +BR2_XZCAT_HOST_DEPENDENCY = host-xz
>  EXTRACTOR_DEPENDENCY_PRECHECKED_EXTENSIONS += .xz .lzma
>  XZCAT = $(HOST_DIR)/bin/xzcat
>  endif
> -- 
> 2.13.6
> 

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