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Newsgroups: comp.lang.ada
Date: Sun, 12 Aug 2018 19:02:29 -0700 (PDT)
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Subject: Re: AdaCore Community 2018 Bugs
From: Roger <rogermcm2@gmail.com>
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Xref: reader02.eternal-september.org comp.lang.ada:54155
Date: 2018-08-12T19:02:29-07:00
List-Id: <comp.lang.ada>

On Monday, August 13, 2018 at 2:37:52 AM UTC+10, Simon Wright wrote:
> Roger <rogermcm2@gmail.com> writes:
> 
> > On Sunday, August 12, 2018 at 5:33:35 PM UTC+10, Simon Wright wrote:
> >> Roger <rogermcm2@gmail.com> writes:
> >> 
> >> > As it now occurs even with GCC 6.1.0 I'm thinking it most likely has
> >> > to do with recent OSX changes.
> >> 
> >> Since it occurs on Debian Stretch, GCC 6.3.0, it can't be just macOS.
> >> 
> >> The actual error reported can change with successive compilations
> >> (sometimes it says something like 'undeclared variable ""', seems to
> >> settle on the CE), a surefire symptom of bad memory handling.
> >> 
> >> > This problem doesn't occur for compile only.
> >> > It occurs when I Build All from GPS
> >> 
> >> The error is a crash in the compiler, doesn't matter how you get there.
> >
> > I Have cut most of the code out of the test program but the crash
> > still occurs.  However, I am making progress on tracking back to the
> > minimal code where the crash first occurs.
> 
> The problem is in the packages Morph.Mesh_Morph_Value_Pointers,
> Mesh_Morph_Weight_Pointers.
> 
> You say
> 
>    package Mesh_Morph_Value_Pointers is new Interfaces.C.Pointers
>      (Interfaces.C.unsigned, API_Morph_Value, API_Morph_Values_Array,
>       API_Morph_Value'(others => <>));
> 
> but
> 
>    type API_Morph_Value is new Interfaces.C.unsigned;
> 
> so others => <> isn't a legal expression for an API_Morph_Value; you
> should say
> 
>       API_Morph_Value'(0));
> 
> 
> There is still a bug, which ought to be fixed, but it's that GNAT has
> failed to recognise the actual problem and has got fatally confused.


Thanks, very much appreciated.
I have made the change but still get the problem in my main program.
I'll check all my other new Interfaces.C.Pointers packages for similar errors.
I'll also update my bug report with this information.