Re: GNAT bug?

[Tucker Taft <stt@averstar.com>]

Pascal Obry wrote:
> 
> Juergen.Hoyng@ri.dasa.de a �crit dans le message
> <79ptl3$jdp$1@nnrp1.dejanews.com>...
> >Hello!
> >
> >The followings compilation units can be compiled with the Ada83 compiler
> VADS
> >6.2.3(c) (Solaris 2.5.1) and Alsys 5.5.4 (HP_UX 10.20).
> >
> 
> [code removed]
> 
> >
> >When trying to compile these compilation units with gnat-3.11p (Solaris
> 2.5.1)
> >I got the error message:
> >x.adb:6:15: expected private type "My_Foo_Type" defined at x.ads:4
> >x.adb:6:15: found type "My_Foo_Type" defined at x.ads:4
> >
> >Is this an Ada95/Ada83 incompatibility or a GNAT bug?
> >
> 
> Your program is wrong :
> 
> Firstly Foo_Op is not visible. The X is defined as a new type so you must
> do a type convertion.

I don't agree.

The declaration of My_Foo_Type causes an implicit
declaration of another "Foo_Op" which takes My_Foo_Type
parameters.

> ... The offending line should read :
> 
>     My_Foo.Foo_Op (My_Foo.Foo_Type (X), My_Foo.Foo_Type (Y));
> 
> You can avoid the type convertion by using subtype instead of type for
> My_Foo_Type
> in package X.

This is not necessary.  Derived type definitions produce
implicit declarations of all "primitive" operations, including
Foo_Op in this case.

> Pascal.

-- 
-Tucker Taft   stt@averstar.com   http://www.averstar.com/~stt/
Technical Director, Distributed IT Solutions  (www.averstar.com/tools)
AverStar (formerly Intermetrics, Inc.)   Burlington, MA  USA