[CMake] How to append a string on list inside a function

[Romain LEGUAY]

Hello everyone,

I try to append a string (target name) on a list inside a function called in other CMakeLists.

I have the following project’s tree:

├── CMakeLists.txt
├── test
    ├── CMakeLists.txt
    └── app
        ├── CMakeLists.txt
        ├── appA
        │   ├── CMakeLists.txt
        │   └── main.cpp
        └── appB
            ├── CMakeLists.txt
            └── main.cpp

Inside the test/CMakeLists.txt, I defined an internal variable like this:
	set(allTestsList "" CACHE INTERNAL "All executable tests.'')
And my function:
	function(addTest targetName)
    		# create the executable with all the souces
		add_executable(${targetName} ${ARGN})
    		list(APPEND allTestsList ${targetName})
    		message("inside addTestFunction. allTestsList: " ${allTestsList})
	endfunction()

I call this function inside the test/app/appA and test/app/appB CMakeLists.txt like this:
	addTest(appA main.cpp)
        addTest(appB main.cpp)

I expected to have as final result:
inside addTestFunction. allTestsList: appA;appB

But I only have:
inside addTestFunction. allTestsList: appB

I suspect that a new variable is created at each call of the function.

Is it possible to use a global variable? (I tried to use PARENT_SCOPE with no success).

Thank you,

Romain