C++ depends heavily on the build system, and it offers no opinion about the build system. That's the problem I've always run into trying to use clangd on a pro

C++ depends heavily on the build system, and it offers no opinion about the build system. That's the problem I've always run into trying to use clangd on a project that wasn't designed for clangd -- there's some Make rule that's important but doesn't fit into their model. The people having success with language servers are using a language that bundles a build system, which is common in more modern languages.