Not report undefined symbols when in sanitizer build.

Not report undefined symbols when in sanitizer build, sanitizers do not support this flag. With this flag, it will lead to linker errors when trying to build with sanitizers.

Author: yingcong-wu

CMakeLists.txt

@@ -298,9 +298,12 @@ if (WIN32)
 elseif(UNIX)
     set_property(TARGET ${TARGET_NAME} APPEND_STRING PROPERTY
         COMPILE_DEFINITIONS LIBOPENCL_CLANG_NAME="$<TARGET_SONAME_FILE_NAME:${TARGET_NAME}>")
-
-    set_property(TARGET ${TARGET_NAME} APPEND_STRING PROPERTY
-        LINK_FLAGS " -Wl,--no-undefined")
+    
+    # Sanitizers do not support this flag, disable this when under sanitizer build
+    if(NOT LLVM_USE_SANITIZER)
+        set_property(TARGET ${TARGET_NAME} APPEND_STRING PROPERTY
+            LINK_FLAGS " -Wl,--no-undefined")
+    endif()
 endif(WIN32)
 
 install(FILES opencl_clang.h