set(LLVM_TOOL_LLVM_LTO_BUILD Off)
endif()
-# Add LTO before clang, ExternalProject requires targets specified in DEPENDS
-# to exist before the call to ExternalProject_Add
+# Add LTO and llvm-ar before clang, ExternalProject requires targets specified
+# in DEPENDS to exist before the call to ExternalProject_Add.
add_llvm_tool_subdirectory(lto)
+add_llvm_tool_subdirectory(llvm-ar)
# Projects supported via LLVM_EXTERNAL_*_SOURCE_DIR need to be explicitly
# specified.