Default to C++11 for testing to address MinGW compilation errors

Author: eramongodb

CMakeLists.txt

@@ -59,6 +59,10 @@ include (CheckLanguage)
 check_language (CXX)
 if (CMAKE_CXX_COMPILER)
    enable_language (CXX)
+   if (NOT CMAKE_CXX_STANDARD)
+      # Default to C++11 for purposes of testing.
+      set (CMAKE_CXX_STANDARD 11)
+   endif ()
 else ()
    message (STATUS "No CXX support")
 endif ()