r262340 - [cmake] Try to appease the buildbots.

[Filipe Cabecinhas via cfe-commits]

Author: filcab
Date: Tue Mar  1 09:07:19 2016
New Revision: 262340

URL: http://llvm.org/viewvc/llvm-project?rev=262340&view=rev
Log:
[cmake] Try to appease the buildbots.

Modified:
    cfe/trunk/runtime/CMakeLists.txt

Modified: cfe/trunk/runtime/CMakeLists.txt
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/runtime/CMakeLists.txt?rev=262340&r1=262339&r2=262340&view=diff
==============================================================================
--- cfe/trunk/runtime/CMakeLists.txt (original)
+++ cfe/trunk/runtime/CMakeLists.txt Tue Mar  1 09:07:19 2016
@@ -27,7 +27,10 @@ set(COMPILER_RT_SRC_ROOT ${LLVM_MAIN_SRC
 # This is the same behavior (try "internal", then check the LLVM_EXTERNAL_...
 # variable) as in add_llvm_external_project
 if(NOT EXISTS ${COMPILER_RT_SRC_ROOT})
-  set(COMPILER_RT_SRC_ROOT ${LLVM_EXTERNAL_COMPILER_RT_SOURCE_DIR})
+  # We don't want to set it if LLVM_EXTERNAL_COMPILER_RT_SOURCE_DIR is ""
+  if(${LLVM_EXTERNAL_COMPILER_RT_SOURCE_DIR})
+    set(COMPILER_RT_SRC_ROOT ${LLVM_EXTERNAL_COMPILER_RT_SOURCE_DIR})
+  endif()
 endif()
 
 if(LLVM_BUILD_EXTERNAL_COMPILER_RT AND EXISTS ${COMPILER_RT_SRC_ROOT}/)