Build rules for Renderscript compatibility library.

Bug: 7419958
Change-Id: I2e0f0bb632e6ff22b2cf1a1b96b28364637995cc
diff --git a/core/java.mk b/core/java.mk
index 222106c..ba7a45c 100644
--- a/core/java.mk
+++ b/core/java.mk
@@ -195,6 +195,26 @@
 $(RenderScript_file_stamp): $(renderscript_sources_fullpath) $(LOCAL_RENDERSCRIPT_CC)
 	$(transform-renderscripts-to-java-and-bc)
 
+ifneq ($(LOCAL_RENDERSCRIPT_COMPATIBILITY),)
+bc_files := $(patsubst %.fs,%.bc, $(patsubst %.rs,%.bc, $(notdir $(renderscript_sources))))
+rs_generated_bc := $(addprefix \
+    $(renderscript_intermediate)/res/raw/, $(bc_files))
+
+rs_compatibility_jni_libs := $(addprefix \
+    $(renderscript_intermediate)/lib, \
+    $(patsubst %.bc,%.so, $(bc_files)))
+
+$(rs_generated_bc) : $(RenderScript_file_stamp)
+
+$(rs_compatibility_jni_libs): $(RenderScript_file_stamp)
+$(rs_compatibility_jni_libs): $(BCC_COMPAT)
+$(rs_compatibility_jni_libs): PRIVATE_CXX := $(TARGET_CXX)
+$(rs_compatibility_jni_libs): $(renderscript_intermediate)/lib%.so: \
+    $(renderscript_intermediate)/res/raw/%.bc
+	$(transform-bc-to-so)
+
+endif
+
 # include the dependency files (.d) generated by llvm-rs-cc.
 renderscript_generated_dep_files := $(addprefix $(renderscript_intermediate)/, \
     $(patsubst %.fs,%.d, $(patsubst %.rs,%.d, $(notdir $(renderscript_sources)))))