vhdl-project-auto-load

vhdl-project-auto-load is a variable defined in `vhdl-mode.el'.
Its value is

(startup)

Documentation:
Automatically load project setups from files.
All project setup files that match the file names specified in option
`vhdl-project-file-name' are automatically loaded. The project of the
(alphabetically) last loaded setup of the first `vhdl-project-file-name'
entry is activated.
A project setup file can be obtained by exporting a project (see menu).
At startup: project setup file is loaded at Emacs startup

You can customize this variable.