[clang] Remove cmake warning message (NFC)

Recognize an empty string for CLANG_DEFAULT_UNWINDLIB as a valid option.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@356920 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 39d8750cc2f1cf2048e6ed0fbf9f8948466cfec6..4b26b288a7435a4daf3a56d653c6475db1fd1507 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -276,7 +276,8 @@ if (CLANG_DEFAULT_UNWINDLIB STREQUAL "")
   endif()
 endif()
 
-if (NOT(CLANG_DEFAULT_UNWINDLIB STREQUAL "none" OR
+if (NOT(CLANG_DEFAULT_UNWINDLIB STREQUAL "" OR
+        CLANG_DEFAULT_UNWINDLIB STREQUAL "none" OR
         CLANG_DEFAULT_UNWINDLIB STREQUAL "libgcc" OR
         CLANG_DEFAULT_UNWINDLIB STREQUAL "libunwind"))
   message(WARNING "Resetting default unwindlib to use platform default")