Fix build with PHP 8.6.0alpha2

[remicollet]

. The XtOffsetOf() alias of C’s offsetof() macro has been removed. Use
offsetof() directly.

Summary by CodeRabbit

• Bug Fixes
  • Improved internal object handling for MaxMind DB instances, supporting more reliable object access and cleanup.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 1d79211e-ecf8-42a7-8759-b97e2426d489

📥 Commits

Reviewing files that changed from the base of the PR and between 89e9135 and ce126b3.

📒 Files selected for processing (1)

• ext/maxminddb.c

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📝 Walkthrough

Walkthrough

Updated the extension’s embedded-object offset calculations to use offsetof in both object fetching and object handler initialization.

Changes

Object Offset Calculation

Layer / File(s)	Summary
Use offsetof for object offsets ext/maxminddb.c	Object fetching and handler initialization now calculate the embedded zend_object offset with offsetof(maxminddb_obj, std).

Estimated code review effort: 1 (Trivial) | ~5 minutes

Poem

A rabbit checks the offset with care,
offsetof hops neatly there.
The object path stays bright and clear,
No macro mischief hiding near.
Nibble, compile, and cheer!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: fixing the build for PHP 8.6.0alpha2.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[gemini-code-assist]

Code Review

This pull request replaces the use of the XtOffsetOf macro with the standard offsetof macro in ext/maxminddb.c when calculating the offset of the std member in maxminddb_obj. This change is applied in both php_maxminddb_fetch_object and the module initialization function PHP_MINIT_FUNCTION(maxminddb). There are no review comments, and I have no feedback to provide.

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[horgh]

Great, thank you! I found
php/php-src@7114314 about this.