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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: ADA and Open GL
Date: Wed, 10 Aug 2011 12:09:52 +0100
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Date: 2011-08-10T12:09:52+01:00
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"ldries46" <bertus.dries@planet.nl> writes:

> My program seems correct now, but I get the following error message:
>
> opengl-glu.ads:373:31: warning: subprogram pointer
> "gluNurbsCallback.CallBackFunc" should have foreign convention
> opengl-glu.ads:373:31: warning: add Convention pragma to declaration
> of "GLU.GLUFUNCPTR" at line 231
>
> This is found in a standard unit nl. the adabindings to Open GL, GLU
> and GLUT
>
> Can I disregard this warning or should I do something to avoid it. I
> don't thoink I should be altering my copy of the ADA bindings so
> where should I do something.
> In my program I don't call this routine directly soit is a result of a
> call from another routine within the ADA bindings.

Perhaps you're compiling with a different set of compiler options than
those used by the developer of the bindings?

Very often, GNAT will in fact translate iffy code like this correctly
(the compiler backend understands C, of course). Better not to risk it,
though, convention errors can be a real pain to debug.

Those bindings aren't "standard" in the RM sense. Personally I'd make
the change and send a patch to the bindings maintainer.