semanticdb-project-roots

semanticdb-project-roots is a variable defined in `db.el'.
Its value is

nil

Documentation:
*List of directories, where each directory is the root of some project.
All subdirectories of a root project are considered a part of one project.
Values in this string can be overridden by project management programs
via the `semanticdb-project-root-functions' variable.

You can customize this variable.