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Newsgroups: comp.lang.ada
Date: Tue, 18 Jan 2022 04:08:14 -0800 (PST)
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Subject: Re: Odd Behaviour
From: Mark Wilson <markwilson@wilsonnet.technology>
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Xref: reader02.eternal-september.org comp.lang.ada:63389
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On Tuesday, January 18, 2022 at 11:51:36 AM UTC, Mark Wilson wrote:
> On Tuesday, January 18, 2022 at 11:48:23 AM UTC, Jeffrey R.Carter wrote: 
> > On 2022-01-18 12:05, Mark Wilson wrote: 
> > > 
> > > then an error is raised: 'warning: Valued_Procedure has no effect for convention Ada [enabled by default]' 
> > The GNAT RM says of pragma Import_Valued_Procedure 
> > 
> > "Note that it is important to use this pragma in conjunction with a separate 
> > pragma Import that specifies the desired convention, since otherwise the default 
> > convention is Ada, which is almost certainly not what is required." 
> > 
> > What happens if you replace the import aspects with pragma Import? 
> > -- 
> > Jeff Carter 
> > "Monsieur Arthur King, who has the brain of a duck, you know." 
> > Monty Python & the Holy Grail 
> > 09
> Tried pragma Import, and even pragma Convention, so, for instance,
> procedure SQLAllocHandle 
> (Result : out SQLRETURN; 
> HandleType : in SQL_HANDLE_TYPE; 
> InputHandle : in SQLHANDLE; 
> OutputHandlePtr : in out SQLHANDLE) 
> with
> Pre => (Handletype = SQL_Handle_Env); 
> 
> pragma Import (C, SQLAllocHandle, "SQLAllocHandle"); 
> pragma Import_Valued_Procedure (SQLAllocHandle); 
> 
> Fails with the same warning. Take the 'pre' out and it works fine.

Even tried (which to be fair is a bit of a long shot),

   procedure SQLAllocHandle
     (Result          : out    SQLRETURN;
      HandleType      : in     SQL_HANDLE_TYPE;
      InputHandle     : in     SQLHANDLE;
      OutputHandlePtr : in out SQLHANDLE);
   --  with
   --    Pre =>   (Handletype = SQL_Handle_Env);
   

   pragma Import (C, SQLAllocHandle);
   pragma Import_Valued_Procedure
     (SQLAllocHandle, "SQLAllocHandle",
      (SQLRETURN, SQL_HANDLE_TYPE, SQLHANDLE, SQLHANDLE),
      (Reference, Value,           Value,     Reference));

Do you think I should file a bug report?