+# Set up the library exports file.
+ifdef EXPORTED_SYMBOL_FILE
+
+# First, set up the native export file, which may differ from the source
+# export file.
+
+ifeq ($(HOST_OS),Darwin)
+# Darwin convention prefixes symbols with underscores.
+NativeExportsFile := $(ObjDir)/$(notdir $(EXPORTED_SYMBOL_FILE)).sed
+$(NativeExportsFile): $(EXPORTED_SYMBOL_FILE) $(ObjDir)/.dir
+ $(Verb) sed -e 's/[[:<:]]/_/' < $< > $@
+clean-local::
+ -$(Verb) $(RM) -f $(NativeExportsFile)
+else
+NativeExportsFile := $(EXPORTED_SYMBOL_FILE)
+endif
+
+# Now add the linker command-line options to use the native export file.
+
+ifeq ($(HOST_OS),Darwin)
+LLVMLibsOptions += -Wl,-exported_symbols_list,$(NativeExportsFile)
+endif
+
+# gold, bfd ld, etc.
+ifeq ($(HAVE_LINK_RETAIN_SYMBOLS_FILE),1)
+LLVMLibsOptions += -Wl,-retain-symbols-file,$(NativeExportsFile)
+endif
+
+endif
+