X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=blobdiff_plain;f=cmake%2Fmodules%2FAddLLVM.cmake;h=59c46f812c648be87f365bbac974982672834d58;hp=6ab580827aa6faced19405a6877b550d3a7db261;hb=fcaa24c56d7dd6f5fd77187e32c40d76927262c8;hpb=44c617819c702572607f2345adf358a1db53ee62;ds=sidebyside

diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
index 6ab580827aa..59c46f812c6 100644
--- a/cmake/modules/AddLLVM.cmake
+++ b/cmake/modules/AddLLVM.cmake
@@ -719,7 +719,11 @@ macro(add_llvm_external_project name)
       "Whether to build ${name} as part of LLVM"
       ${LLVM_TOOL_${nameUPPER}_BUILD_DEFAULT})
     if (LLVM_TOOL_${nameUPPER}_BUILD)
-      add_subdirectory(${LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR} ${add_llvm_external_dir})
+      if(EXISTS ${LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR})
+        add_subdirectory(${LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR} ${add_llvm_external_dir})
+      elseif(NOT "${LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR}" STREQUAL "")
+        message(WARNING "Nonexistent directory for ${name}: ${LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR}")
+      endif()
       # FIXME: It'd be redundant.
       set(LLVM_TOOL_${nameUPPER}_BUILD Off)
     endif()