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

Bắt đầu với Zend/zend_atomic.h và tái hiện bản build PHP 8.2 trên các phiên bản macOS và Apple clang bị ảnh hưởng được liệt kê trong báo cáo. So sánh hành vi của các thao tác nguyên tử giữa các phiên bản trình biên dịch được báo cáo; công việc hoàn tất khi PHP build thành công trên các hệ thống bị ảnh hưởng mà không gây hồi quy cho các cấu hình mới hơn và cũ hơn.