Needs to sync with lib version and Sencode.

config/cmake_ext_mod/HDFMacros.cmake

@@ -27,8 +27,12 @@ macro (SET_HDF_BUILD_TYPE)
       set(HDF_BUILD_TYPE "Release")
     endif()
   endif()
-  if(NOT CMAKE_BUILD_TYPE)
-    set(CMAKE_BUILD_TYPE "Release")
+  if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
+    message(STATUS "Setting build type to 'RelWithDebInfo' as none was specified.")
+    set(CMAKE_BUILD_TYPE RelWithDebInfo CACHE STRING "Choose the type of build." FORCE)
+    # Set the possible values of build type for cmake-gui
+    set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release"
+      "MinSizeRel" "RelWithDebInfo")
   endif()
 endmacro ()