Make external toolchain relocatable

The external toolchain wrapper sets sysroot etc. to an absolute path.
By changing this to a relative path, it is possible to move the host
directory to a different location and still have a working build
system.

This only works for a downloaded external toolchain.  For a pre-installed
external toolchain, it is possible to move the host directory to a
different location, but not the external toolchain directory (it does work
if the external toolchain directory lies within the host directory).  For
an internal or crosstool-ng toolchain, there is no wrapper so updating the
sysroot path should be done in a different way.

See http://lists.busybox.net/pipermail/buildroot/2012-February/050371.html
for information about others things to do to make the host directory
relocatable.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Acked-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

1 files changed, 2 insertions, 1 deletions

diff --git a/package/Makefile.in b/package/Makefile.in
index 038bd9c9c..a8bf36b18 100644
--- a/package/Makefile.in
+++ b/package/Makefile.in
@@ -65,7 +65,8 @@ ifeq ($(BR2_xtensa),y)
 TARGET_ABI += -mlongcalls
 endif
 
-STAGING_DIR=$(HOST_DIR)/usr/$(GNU_TARGET_NAME)/sysroot
+STAGING_SUBDIR = usr/$(GNU_TARGET_NAME)/sysroot
+STAGING_DIR    = $(HOST_DIR)/$(STAGING_SUBDIR)
 
 TARGET_OPTIMIZATION:=$(call qstrip,$(BR2_TARGET_OPTIMIZATION))