Merge pull request ceph#53800 from batrick/cmake-debug-wrn

CMakeLists: warn if CMAKE_BUILD_TYPE is set/unset

Reviewed-by: Ilya Dryomov <[email protected]>

Author: idryomov

CMakeLists.txt

@@ -24,9 +24,12 @@ endforeach()
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake/modules/")
 
 if(NOT CMAKE_BUILD_TYPE AND EXISTS "${CMAKE_SOURCE_DIR}/.git")
+  message(WARNING "CMAKE_BUILD_TYPE not specified, assuming CMAKE_BUILD_TYPE=Debug because .git exists.")
   set(default_build_type "Debug")
   set(CMAKE_BUILD_TYPE "${default_build_type}" CACHE
       STRING "Default BUILD_TYPE is Debug, other options are: RelWithDebInfo, Release, and MinSizeRel." FORCE)
+else()
+  message(WARNING "CMAKE_BUILD_TYPE not specified, leaving unset because .git does NOT exist.")
 endif()
 
 if(CMAKE_SYSTEM_NAME MATCHES "Linux")