-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.