[Info-vax] DEC C 64/32 bit pointer conversion question

[Arne Vajhøj]

On 9/13/2019 9:32 AM, John E. Malmberg wrote:
> It seems to work well when all the code is in the same module.
> 
> In my actual library that uses this same code it is failing by producing 
> a negative 32 bit pointer for these values.
> 
> So I am trying to figure out what I am doing wrong.

> It looks like the compiler is generating different code when everything 
> is in one source compilation then when the source pointer is from a 
> separately compiled module and destination pointer to be updated is 
> passed by address from the same separately compiled module.
> 
> If I cast the result from the masked 64 bit pointer to an unsigned, I 
> get the correct number.
> 
> When I then try to put that unsigned number in a 32 bit char pointer, I 
> get a negative address.
> 
> Everything I have tried so far in the actual code results in a negative 
> 32 bit pointer being saved.
> 
> I can not reproduce it in an example that only uses one compilation 
> module.  In a single compilation I get the correct 32 bit pointer value 
> returned.

Can you provide a two module example showing the problem?

Arne