gcc vs clang

[Puneet M]

Hello,

I have a table (adjlist) of the form: id, num-links, {links}.

Here id and num-links are int64 (I) and links is an array of ints that I am storing as a raw array (u).  Key format is I(id), and the value format is Iu (num-links, links).

Links can be empty, and therefore I had this logic in my code for creating an empty array:

When I compile this with clang (Ubuntu clang version 13.0.0-2), this works just fine. However, when I use GCC (v9.3.0), I run into the following error:

Is there something fundamentally wrong that I am doing, or have I run into a strange compiler issue? What is the recommended way to store an empty WT_ITEM?

thanks,

-puneet

[alexande...@mongodb.com]

Hi Puneet,

Thanks for using WiredTiger and for reaching out!

I *think* you should be passing the WT_ITEM structure to the WT_CURSOR::set_value call by reference instead of directly. So:

cursor->set_value(cursor, 0, &item);

instead of:

cursor->set_value(cursor, 0, item);

- Alex

[Alexey Anisimov]

Hi Puneet,

Thanks for your interest in WiredTiger! In your example, "cursor->set_value" expects a pointer as the third argument. Please refer to this example.

Please let me know if the suggested solution works for you.

Regards,

Alexey

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{ name     : "Alexey Anisimov",
  title    : "Senior Software Engineer",
  location : "Sydney, Australia" }