Re: [No_Elaboration_Code] GNAT still generating rep_to_pos, why?

["Robert I. Eachus" <rieachus@comcast.net>]

Luke A. Guest wrote:

> Although a kernel is not a *normal* program, Ada was designed to be
> used in the embedded sector with or without an OS, so there must be a
> solution as somebody must've needed to do what I'm wanting to do at some point.

It depends on what you need done.  I'm not sure, but from what you have 
posted it sounds like you have a data structure that has to be located 
at a particular location, and not be initialized by GNAT.

pragma No_Run_Time will not do this.  You need to use pragma Import if 
you don't want the access values to be set by default to null.  This is 
not done by the run-time, it is done by the elaboration code for the 
unit where the imported object is declared, usually the main program. 
See RM B.1(24).  This is one of those things which makes sense once you 
grok the whole--the only case where you don't want default 
initializations is where the initializations are explicitly performed by 
non-Ada code.  But it is often the case that the object you need not to 
be default initialized when calling C code is a pointer, not the data 
itself.  Sometimes you even need two pragma Imports for one object, one 
for a pointer, and one for the data object itself.

-- 
                                           Robert I. Eachus

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