[cmake] Treat polly as "in tree" if LLVM_EXTERNAL_POLLY_SOURCE_DIR is provided

Differential Revision: https://reviews.llvm.org/D25354

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@283608 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 85d4b51e00b584dc1452833e1cca9fde4ab8ca90..4d4aa9f69f9984513ea7779721de52f0a2e4d6e7 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -395,6 +395,8 @@ option(LLVM_POLLY_BUILD "Build LLVM with Polly" ON)
 
 if (EXISTS ${LLVM_MAIN_SRC_DIR}/tools/polly/CMakeLists.txt)
   set(POLLY_IN_TREE TRUE)
+elseif(LLVM_EXTERNAL_POLLY_SOURCE_DIR)
+  set(POLLY_IN_TREE TRUE)
 else()
   set(POLLY_IN_TREE FALSE)
 endif()