Have Debug builds default to ref checking

Otherwise old build directories will switch to not having refchecking.

CMakeLists.txt

@@ -49,7 +49,11 @@ option(ENABLE_LLVM_DEBUG "LLVM debug symbols" OFF)
 option(ENABLE_OPROFILE "enable oprofile support" OFF)
 option(ENABLE_SELF_HOST "use pyston to test pyston" OFF)
 option(ENABLE_VALGRIND "pyston valgrind support" OFF)
-option(ENABLE_REF_DEBUG "enable memory and refcounting debugging" OFF)
+if(${CMAKE_BUILD_TYPE} STREQUAL "Debug")
+  option(ENABLE_REF_DEBUG "enable memory and refcounting debugging" ON)
+else()
+  option(ENABLE_REF_DEBUG "enable memory and refcounting debugging" OFF)
+endif()
 
 option(ENABLE_PGO "enable -fprofile-generate/-fprofile-use" OFF)
 option(ENABLE_LTO "enable -flto" OFF)

Makefile

@@ -655,7 +655,7 @@ $(CMAKE_SETUP_DBG):
 	@$(MAKE) cmake_check
 	@$(MAKE) clang_check
 	@mkdir -p $(CMAKE_DIR_DBG)
-	cd $(CMAKE_DIR_DBG); CC='clang' CXX='clang++' cmake $(COMMON_CMAKE_OPTIONS) -DCMAKE_BUILD_TYPE=Debug -DENABLE_REF_DEBUG=ON
+	cd $(CMAKE_DIR_DBG); CC='clang' CXX='clang++' cmake $(COMMON_CMAKE_OPTIONS) -DCMAKE_BUILD_TYPE=Debug
 $(CMAKE_SETUP_RELEASE):
 	@$(MAKE) cmake_check
 	@$(MAKE) clang_check