[Buildroot] [PATCH] Reset LD and AR environment variables

[Nicolas Dichtel]

The goal is to fix the compilation of perf (from linux) when LD or AR
variables are inherited from the environment.
After the linux upstream commits 5ef7bbb09f7b ("perf tools: Allow to
specify custom linker command") and 3c71ba3f80bb ("perf tools: Really allow
to specify custom CC, AR or LD") CC, AR, and LD variables are not overridden
if they are inherited.

In case of a cross compilation, it results in an inconsistent state: CC is
overridden but not LD and AR.

Linux-patch: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5ef7bbb09f7b
Linux-patch: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3c71ba3f80bb
Signed-off-by: Nicolas Dichtel <nicolas.dichtel at 6wind.com>
---
 Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Makefile b/Makefile
index ea8b1e4e51c8..55735ea735ae 100644
--- a/Makefile
+++ b/Makefile
@@ -343,6 +343,8 @@ ifeq ($(BR2_HAVE_DOT_CONFIG),y)
 unexport CROSS_COMPILE
 unexport ARCH
 unexport CC
+unexport LD
+unexport AR
 unexport CXX
 unexport CPP
 unexport RANLIB
-- 
2.4.2