Re: Interface to C; Storage_Error

[Robert Dewar <robert_dewar@my-deja.com>]

In article <91padu$572$1@nnrp1.deja.com>,
  Ted Dennison <dennison@telepath.com> wrote:

> That brings me to the second issue; pragma Import does
> essentially th same job as pragma Import_Valued_Procedure.
> Check the gnat docs, but it seems wrong to me that they are
> being used together.

I suggest that if you want to offer advice on GNAT specific
pragmas, you read the GNAT documentation, rather than guessing,
since a completely wrong guess (as in this case) simply
confuses people. One of the troubles with CLA is that a
high proportion of the advice here is plain wrong.

In this particular case, a cursory check of the GNAT
documentation would have found the sentence:

 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.

Incidentally the use of pragma Import_Valued_Procedure is
perfectly reasonable in this case, and it is not so easily
replaced  by pragma Import alone (that's why DEC invented
this useful feature for interfacing to C).


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