Build error "error: zero as null pointer constant” (Xcode 15)

[snej]

Description

Building doctest with CMake on a Mac with Xcode 15.0 produces this error:

doctest/parts/doctest.cpp:1468:60: error: zero as null pointer constant [-Werror,-Wzero-as-null-pointer-constant]
        if(sysctl(mib, DOCTEST_COUNTOF(mib), &info, &size, 0, 0) != 0) {
                                                           ^

This does not occur when using the latest release of doctest.h in my Xcode project, oddly enough. Perhaps my config doesn’t turn on that specific warning?

Steps to reproduce

1. Clone doctest repo
2. cd doctest
3. mkdir build && cd build && cmake .. && make

Extra information

• doctest version: dev branch, d7a5eeb
• Operating System: macOS 14.1.1
• Compiler+version: Apple clang version 15.0.0 (clang-1500.0.40.1) i.e. Xcode 15.0