Stopping Before Main Program (Debugging with GDB)

From Get docs
Gdb/docs/latest/gdb/Stopping-Before-Main-Program


15.4.10.5 Stopping at the Very Beginning

It is sometimes necessary to debug the program during elaboration, and before reaching the main procedure. As defined in the Ada Reference Manual, the elaboration code is invoked from a procedure called adainit. To run your program up to the beginning of elaboration, simply use the following two commands: tbreak adainit and run.