Fixing mac build

 MacOS static linker does not understand --export-dynamic
 and --version-script. According to man ld there is
 -export_dynamic option which should do the same
 thing.

Change-Id: I8cde8c6c7305bebbbcc9dded143fa5cdaf386d65
diff --git a/dalvikvm/Android.mk b/dalvikvm/Android.mk
index b7e649a..d5f3586 100644
--- a/dalvikvm/Android.mk
+++ b/dalvikvm/Android.mk
@@ -55,7 +55,13 @@
 LOCAL_CFLAGS := $(dalvikvm_cflags)
 LOCAL_C_INCLUDES := art/runtime
 LOCAL_SHARED_LIBRARIES := libnativehelper
-LOCAL_LDFLAGS := -ldl -lpthread -Wl,--export-dynamic
+LOCAL_LDFLAGS := -ldl -lpthread
+# Mac OS linker doesn't understand --export-dynamic.
+ifneq ($(HOST_OS),darwin)
+  LOCAL_LDFLAGS += -Wl,--export-dynamic
+else
+  LOCAL_LDFLAGS += -Wl,-export_dynamic
+endif
 LOCAL_ADDITIONAL_DEPENDENCIES += $(LOCAL_PATH)/Android.mk
 LOCAL_ADDITIONAL_DEPENDENCIES += art/build/Android.common.mk
 LOCAL_IS_HOST_MODULE := true