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

Commencez par Zend/zend_atomic.h et reproduisez le build de PHP 8.2 sur les versions concernées de macOS et d’Apple clang indiquées dans le rapport. Comparez le comportement des opérations atomiques entre les versions de compilateur signalées ; le travail est terminé lorsque PHP se compile correctement sur les systèmes concernés sans entraîner de régression dans les configurations plus récentes et plus anciennes.