I never found a C++ IDE capable of understanding our root CMake project so it can gives us autocompletion and inline errors.

We have a root project that's fully CMake, that orchestrates our sub libraries (also using CMake, declared with ExternalProject_Add) so the dependees are built before their dependents (and also to handle final packaging). The subprojects are added as git submodules.

I tried VSCode and QtCreator but none of them seem to support CMake multi-projects defined in this way. I have to create a build directory per subproject, which can be painful when we have so many subprojects.