ada-which-compiler

ada-which-compiler is a variable defined in `ada-mode.el'.
Its value is

gnat

Documentation:
Name of the compiler to use.
This will determine what features are made available through the Ada mode.
The possible choices are:
`gnat': Use Ada Core Technologies' GNAT compiler. Add some cross-referencing
features.
`generic': Use a generic compiler.

You can customize this variable.