Makefile: reset LD and AR environment variables
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@6wind.com>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
diff --git a/Makefile b/Makefile
index ea8b1e4..55735ea 100644
--- a/Makefile
+++ b/Makefile
@@ -343,6 +343,8 @@
unexport CROSS_COMPILE
unexport ARCH
unexport CC
+unexport LD
+unexport AR
unexport CXX
unexport CPP
unexport RANLIB