[PATCH 2/3] tools lib lk: Fix for cross build

[Joonsoo Kim]

Currently, lib lk doesn't use CROSS_COMPILE environment variable,
so cross build is always failed. This is a quick fix for this problem.

Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>

diff --git a/tools/lib/lk/Makefile b/tools/lib/lk/Makefile
index 926cbf3..91e5174 100644
--- a/tools/lib/lk/Makefile
+++ b/tools/lib/lk/Makefile
@@ -1,5 +1,20 @@
 include ../../scripts/Makefile.include
 
+# Makefiles suck: This macro sets a default value of $(2) for the
+# variable named by $(1), unless the variable has been set by
+# environment or command line. This is necessary for CC and AR
+# because make sets default values, so the simpler ?= approach
+# won't work as expected.
+define allow-override
+  $(if $(or $(findstring environment,$(origin $(1))),\
+            $(findstring command line,$(origin $(1)))),,\
+    $(eval $(1) = $(2)))
+endef
+
+# Allow setting CC and AR, or setting CROSS_COMPILE as a prefix.
+$(call allow-override,CC,$(CROSS_COMPILE)gcc)
+$(call allow-override,AR,$(CROSS_COMPILE)ar)
+
 # guard against environment variables
 LIB_H=
 LIB_OBJS=
-- 
1.7.9.5

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