address argument to atomic operation must be a pointer to non-const _Atomic type

Description

Hello! I'm the maintainer of php in MacPorts, and I noticed this build failure of php 8.2.0alpha2 and 8.2.0alpha1 on macOS 10.13 with Xcode 9.4.1 and its Apple clang 902.0.39.2:

Zend/zend_atomic.h:85:9: error: address argument to atomic operation must be a pointer to non-const _Atomic type ('const _Atomic(bool) *' invalid)
        return __c11_atomic_load(&obj->value, __ATOMIC_SEQ_CST);
               ^                 ~~~~~~~~~~~

Here is a full failed build log from macOS 10.13.

I also verified the problem on macOS 10.13 with Xcode 10.1 and its Apple clang 1000.11.45.5.

It also fails similarly on macOS 10.12, OS X 10.11, and OS X 10.10.

The build succeeds on macOS 10.14 with Xcode 10.3 and its Apple clang 1001.0.46.4 and on newer systems. Here is a full successful build log from macOS 10.14.

Curiously the build also succeeds on much older systems like OS X 10.9, OS X 10.8, and Mac OS X 10.7 with their older versions of Xcode and clang.

I see "c11" in the error message but I don't see -std=c11 being passed to the compiler. Thinking this might be a situation where certain older compilers would support whatever you're wanting to do if only you would ask the compiler to be in c11 mode, I tried adding -std=c11 on macOS 10.13 with Xcode 10.1 and its Apple clang 1000.11.45.5, and I also tried -std=gnu11, but neither of those changed the error.

php 8.1.7 and earlier don't have this problem.

PHP Version

8.2.0alpha2

Operating System

macOS 10.13.6

Zend/zend_atomic.h から始め、報告に記載されている影響を受ける macOS と Apple clang のバージョンで PHP 8.2 のビルドを再現してください。報告されたコンパイラーバージョン間でアトミック操作の動作を比較します。影響を受けるシステムで PHP のビルドが正常に成功し、新しい構成と古い構成にリグレッションが発生しなければ作業完了です。