[Buildroot] [PATCH] Makefile: unexport O

[Guido Martínez]

After bee5745ccc2 ("Makefile: don't depend on the umask"), any use
of "make O=<dir>" would leak $O into the enviroment for submakes,
and it's inherited by package makefiles. Some package makefiles have
protections to make sure they don't use the value of $O if it comes from
the enviroment (Linux), but some don't (uClibc).

This caused build failures when using a different output dir.

Fix this by unconditionally unexporting the O variable, since we never
need to have it set in the environment for packages, it should be only
internally used by BR.

Signed-off-by: Guido Martínez <guido at vanguardiasur.com.ar>
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index 8b9c5d9..9059884 100644
--- a/Makefile
+++ b/Makefile
@@ -329,6 +329,7 @@ unexport CONFIG_SITE
 unexport QMAKESPEC
 unexport TERMINFO
 unexport MACHINE
+unexport O
 
 GNU_HOST_NAME := $(shell support/gnuconfig/config.guess)
 
-- 
2.1.4