From fd10b42ab8db0cd5d2f3c9076d54244c6e0e60a8 Mon Sep 17 00:00:00 2001
From: Thomas De Schampheleire <patrickdepinguin+buildroot@gmail.com>
Date: Wed, 8 Feb 2012 17:22:20 +0100
Subject: dependencies: build a host-tar if no suitable tar can be found

Some toolchains, like the one built with buildroot itself, use hardlinks (for
example to link between the c++ and g++ binary). Unpacking such a toolchain
with the --strip-components options does not work correctly if the system tar
is too old (<1.17). Even recent releases of RedHat/CentOS still ship with
tar 1.15.

This patch checks for a suitable tar version (tar 1.17+) on the host system,
and adds host-tar to the host dependencies if none can be found.

host-tar is download and extracted as cpio.gz instead of tar.gz, to prevent
chicken-egg problem.

Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
v4 Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
---
 package/Makefile.package.in | 12 ------------
 package/tar/tar.mk          | 13 +++++++++++++
 2 files changed, 13 insertions(+), 12 deletions(-)

(limited to 'package')

diff --git a/package/Makefile.package.in b/package/Makefile.package.in
index 1ace683c2..33461b4dc 100644
--- a/package/Makefile.package.in
+++ b/package/Makefile.package.in
@@ -299,18 +299,6 @@ define DOWNLOAD
 	exit 1
 endef
 
-# Utility programs used to build packages
-TAR ?= tar
-
-# Automatically detect tar --strip-path/components option
-TAR_STRIP_COMPONENTS := \
-  $(shell $(TAR) --help | grep strip-path > /dev/null ; \
-  if test $$? = 0 ; then \
-   echo '--strip-path' ; \
-  else \
-   echo '--strip-components' ; \
-  fi)
-
 # Needed for the foreach loops to loop over the list of hooks, so that
 # each hook call is properly separated by a newline.
 define sep
diff --git a/package/tar/tar.mk b/package/tar/tar.mk
index edbd9bdc7..9e856b53f 100644
--- a/package/tar/tar.mk
+++ b/package/tar/tar.mk
@@ -10,6 +10,19 @@ TAR_SITE = $(BR2_GNU_MIRROR)/tar
 # Prefer full-blown tar over buybox's version
 ifeq ($(BR2_PACKAGE_BUSYBOX),y)
 TAR_DEPENDENCIES += busybox
+HOST_TAR_DEPENDENCIES =
 endif
 
 $(eval $(call AUTOTARGETS))
+
+# host-tar: use cpio.gz instead of tar.gz to prevent chicken-egg problem
+# of needing tar to build tar.
+HOST_TAR_SOURCE = tar-$(TAR_VERSION).cpio.gz
+define HOST_TAR_EXTRACT_CMDS
+	mkdir -p $(@D)
+	cd $(@D) && \
+		$(INFLATE.gz) $(DL_DIR)/$(HOST_TAR_SOURCE) | cpio -i
+	mv $(@D)/tar-$(TAR_VERSION)/* $(@D)
+	rmdir $(@D)/tar-$(TAR_VERSION)
+endef
+$(eval $(call AUTOTARGETS,host))
-- 
cgit v1.2.3