From: Filipe Cabecinhas <me@filcab.net>
Date: Tue, 1 Mar 2016 15:07:19 +0000 (+0000)
Subject: [cmake] Try to appease the buildbots.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=0c6c48e85cdec0a418e0b865ce28c09f11af5631;p=clang

[cmake] Try to appease the buildbots.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@262340 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/runtime/CMakeLists.txt b/runtime/CMakeLists.txt
index 26d6c1233c..99298e11b1 100644
--- a/runtime/CMakeLists.txt
+++ b/runtime/CMakeLists.txt
@@ -27,7 +27,10 @@ set(COMPILER_RT_SRC_ROOT ${LLVM_MAIN_SRC_DIR}/projects/compiler-rt)
 # 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}/)