[Buildroot] [PATCH] package/Makefile.in: export O= to post-build/image scripts for out-of-tree builds

[Peter Korsgaard <peter@korsgaard.com>]

Sometimes it can be interesting to call back into buildroot from a
post-build/image script (E.G. make printvars or similar). For this to work
correctly with out-of-tree builds we need to pass O= to make, but this is
currently not available in the environment of post-build/image scripts.

In concept, O could be derrived from BUILD_DIR (E.G. by stripping /build),
but directly exporting O is cleaner.

O= cannot be exported globally as it interferes with various build systems,
so instead add it to EXTRA_ENV.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
---
 package/Makefile.in | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/package/Makefile.in b/package/Makefile.in
index b95e5e3fa8..a2b0d90f32 100644
--- a/package/Makefile.in
+++ b/package/Makefile.in
@@ -309,7 +309,8 @@ HOST_CONFIGURE_OPTS = \
 EXTRA_ENV = \
 	PATH=$(BR_PATH) \
 	BR2_DL_DIR=$(BR2_DL_DIR) \
-	BUILD_DIR=$(BUILD_DIR)
+	BUILD_DIR=$(BUILD_DIR) \
+	O=$(CANONICAL_O)
 
 ################################################################################
 # settings we need to pass to configure
-- 
2.11.0