Understanding the dependency to a-calend.adb introduced by gnatcoll-xref.adb in gnatcoll-xref.ali

[David SAUVAGE <david.sauvage@adalabs.com>]

Hi.all,

This is a GNAT specific topic, we are trying to understand why a dependency to Ada.Calendar implementation is introduced by the GNATColl.Xref unit in the gnatcoll-xref.ali [2] Ada Library Information [1] file

I would suppose this could be needed in the case of generic-related-uses, but as that does not seem to be the case here, I would expect only a dependency to a-calend.ads 

Any feedbacks are most welcome,

Cheers

[1] ALI specifications
http://docs.adacore.com/gnat_ugn-docs/html/gnat_ugn/gnat_ugn/the_gnat_compilation_model.html#the-ada-library-information-files
http://www.seas.gwu.edu/~adagroup/gnat-docs/gnat-3.13p-docs/gnat_ug.html#SEC21
https://www2.adacore.com/gap-static/GNAT_Book/html/frontend/lib-writ__adb.htm


[2] GNAT GPL 2014 version
W ada.calendar%s    a-calend.adb        a-calend.ali
D a-calend.ads		20140406181358 d86d6c8c ada.calendar%s
D a-calend.adb		20140406181357 a0075950 ada.calendar%b