[php-src] Issue #8881: address argument to atomic operation must be a pointer to non-const _Atomic type

Issue: https://github.com/php/php-src/issues/8881 Author: ryandesign ### 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](https://build.macports.org/builders/ports-10.13_x86_64-builder/builds/155257/steps/install-port/logs/stdio). 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](https://build.macports.org/builders/ports-10.12_x86_64-builder/builds/191235/steps/install-port/logs/stdio), [OS X 10.11](https://build.macports.org/builders/ports-10.11_x86_64-builder/builds/186961/steps/install-port/logs/stdio), and [OS X 10.10](https://build.macports.org/builders/ports-10.10_x86_64-builder/builds/187989/steps/install-port/logs/stdio). 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](https://build.macports.org/builders/ports-10.14_x86_64-builder/builds/131801/steps/install-port/logs/stdio). Curiously the build also succeeds on much older systems like [OS X 10.9](https://build.macports.org/builders/ports-10.9_x86_64-builder/builds/193206/steps/install-port/logs/stdio), [OS X 10.8](https://build.macports.org/builders/ports-10.8_x86_64-builder/builds/95019/steps/install-port/logs/stdio), and [Mac OS X 10.7](https://build.macports.org/builders/ports-10.7_x86_64-builder/builds/105173/steps/install-port/logs/stdio) 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