The following are some typical Ada compilation command line examples:
$ gcc -c xyz.adb
Compile body in file xyz.adb with all default options.
$ gcc -c -O2 -gnata xyz-def.adb
Compile the child unit package in file xyz-def.adb with extensive
optimizations, and pragma Assert/Debug statements
enabled.
$ gcc -c -gnatc abc-def.adb
Compile the subunit in file abc-def.adb in semantic-checking-only
mode.