Host support for prefer symlink

We need a host symlink for dalvik, our *-dalvik-host build targets
are failing.

Change-Id: I6045de20c948b456a150033deb3459895aff83c6
diff --git a/core/executable_prefer_symlink.mk b/core/executable_prefer_symlink.mk
index 2f04d0d..f66a5f2 100644
--- a/core/executable_prefer_symlink.mk
+++ b/core/executable_prefer_symlink.mk
@@ -4,21 +4,30 @@
 #
 # Note: now only limited to the binaries that will be installed under system/bin directory
 
-my_symlink := $(addprefix $(TARGET_OUT)/bin/, $(LOCAL_MODULE))
 # Create link to the one used depending on the target
 # configuration. Note that we require the TARGET_IS_64_BIT
 # check because 32 bit targets may not define TARGET_PREFER_32_BIT_APPS
 # et al. since those variables make no sense in that context.
-ifeq ($(TARGET_IS_64_BIT),true)
-ifneq ($(TARGET_PREFER_32_BIT_APPS),true)
-  $(my_symlink): PRIVATE_SRC_BINARY_NAME := $(LOCAL_MODULE_STEM_64)
-else
-  $(my_symlink): PRIVATE_SRC_BINARY_NAME := $(LOCAL_MODULE_STEM_32)
-endif
-else
-  $(my_symlink): PRIVATE_SRC_BINARY_NAME := $(LOCAL_MODULE_STEM_32)
-endif
 
+ifneq ($(LOCAL_IS_HOST_MODULE),true)
+  my_symlink := $(addprefix $(TARGET_OUT)/bin/, $(LOCAL_MODULE))
+  ifeq ($(TARGET_IS_64_BIT),true)
+    ifneq ($(TARGET_PREFER_32_BIT_APPS),true)
+$(my_symlink): PRIVATE_SRC_BINARY_NAME := $(LOCAL_MODULE_STEM_64)
+    else
+$(my_symlink): PRIVATE_SRC_BINARY_NAME := $(LOCAL_MODULE_STEM_32)
+    endif
+  else
+$(my_symlink): PRIVATE_SRC_BINARY_NAME := $(LOCAL_MODULE_STEM_32)
+  endif
+else
+  my_symlink := $(addprefix $(HOST_OUT)/bin/, $(LOCAL_MODULE))
+  ifneq ($(HOST_PREFER_32_BIT),true)
+$(my_symlink): PRIVATE_SRC_BINARY_NAME := $(LOCAL_MODULE_STEM_64)
+  else
+$(my_symlink): PRIVATE_SRC_BINARY_NAME := $(LOCAL_MODULE_STEM_32)
+  endif
+endif
 
 $(my_symlink): $(LOCAL_INSTALLED_MODULE) $(LOCAL_MODULE_MAKEFILE)
 	@echo "Symlink: $@ -> $(PRIVATE_SRC_BINARY_NAME)"
@@ -30,4 +39,7 @@
 # local module name
 ALL_MODULES.$(LOCAL_MODULE).INSTALLED += $(my_symlink)
 
+# Create the symlink when you run mm/mmm or "make <module_name>"
+$(LOCAL_MODULE) : $(my_symlink)
+
 my_symlink :=