From 5f184b4bb726f820c9d5b591ec546b8d3dd8b5a3 Mon Sep 17 00:00:00 2001
From: NAKAMURA Takumi <geek4civic@gmail.com>
Date: Sat, 22 Aug 2015 05:11:02 +0000
Subject: [PATCH] [CMake] add_llvm_external_project: Just warn about
 nonexistent directories.

These entries were generated accidentally.

llvm-svn: 245783
---
 cmake/modules/AddLLVM.cmake | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

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()