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dependencies: build a host-tar if no suitable tar can be found

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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>
This commit is contained in:
Thomas De Schampheleire
2012-02-08 17:22:20 +01:00
committed by Peter Korsgaard
parent 1bbf39bd73
commit fd10b42ab8
4 changed files with 57 additions and 12 deletions
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13
package/tar/tar.mk
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@@ -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))