vhdl-optional-labels

vhdl-optional-labels is a variable defined in `vhdl-mode.el'.
Its value is

process

Documentation:
Constructs for which labels are to be queried.
Template generators prompt for optional labels for:
None : no constructs
Processes only: processes only (also procedurals in VHDL-AMS)
All constructs: all constructs with optional labels and keyword END

You can customize this variable.