[Buildroot] [PATCH v4 5/9] package/pkg-generic: handle host-xz as an extract dependency

Thomas Petazzoni thomas.petazzoni at bootlin.com
Sat Mar 24 14:20:04 UTC 2018

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

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-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 at bootlin.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>
Changes in v3:
 - Added Reviewed-by from Yann.

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 ae50c5f284..b03d7263b1 100644
--- a/package/pkg-generic.mk
+++ b/package/pkg-generic.mk
@@ -559,6 +559,10 @@ ifeq ($(filter host-tar host-skeleton,$(1)),)
+ifeq ($(filter host-tar host-skeleton host-xz,$(1)),)
 # Eliminate duplicates in 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
+# we are built before ccache
 $(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)))
 XZCAT = $(HOST_DIR)/bin/xzcat

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