3.11.4.3 Switches
-fdump-ada-spec-
Generate Ada spec files for the given header files transitively (including
all header files that these headers depend upon).
-fdump-ada-spec-slim-
Generate Ada spec files for the header files specified on the command line
only.
-fada-spec-parent=`unit'-
Specifies that all files generated by `-fdump-ada-spec*' are
to be child units of the specified parent unit.
-C-
Extract comments from headers and generate Ada comments in the Ada spec files.