mark_as_advanced strange behaviour

Development
,
1

I’m currently learning in-deep CMake and I found something I don’t understand.

I have this script:

cmake_minimum_required(VERSION 4.2)

project(CmakeLearn VERSION 1.0 LANGUAGES CXX)

# check that CMAKE_BUILD_TYPE is defined
set(BUILD_TYPES "Debug" "Release" "RelWithDebInfo" "MinSizeRel")
if(NOT (CMAKE_BUILD_TYPE IN_LIST BUILD_TYPES))
	message(FATAL_ERROR "CMAKE_BUILD_TYPE is not defined! Please set it to Debug, Release, RelWithDebInfo, or MinSizeRel.")
endif()

set(SOURCE_FILES
    "src/main.cpp"
)

add_executable(MyApp ${SOURCE_FILES})
target_include_directories(MyApp PRIVATE ./include)

set(CACHE{MYAPP_ADVANCED_CVAR}
	TYPE STRING
	HELP "This cache variable is hidden"
	VALUE "I'm hidding")

#mark_as_advanced(MYAPP_ADVANCED_CVAR)

If I execute it in the GUI I see these non-advanced variables:

  • CMAKE_BUILD_TYPE
  • CMAKE_INSTALL_PREFIX
  • MYAPP_ADVANCED_CVAR

If I uncomment the last line to mark MYAPP_ADVANCED_CVAR as advanced it changes to this:

  • CMAKE_INSTALL_PREFIX

I don’t understand why the CMAKE_BUILD_TYPE disappears from the non-advanced list of variables.

Also, shouldn’t CMAKE_INSTALL_PREFIX be an advanced variable?

I’m using CMake 4.2.1 in Ubuntu 20.