Maybe changing the way we set the standard will fix it?

.github/workflows/cmake-multi-platform.yml

@@ -31,7 +31,7 @@ jobs:
           - os: ubuntu-latest
             cpp_compiler: clang++
           - os: macos-latest
-            cpp_compiler: g++
+            cpp_compiler: clang++
 
     steps:
     - uses: actions/checkout@v4

CMakeLists.txt

@@ -6,7 +6,9 @@ if (MSVC)
     set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
 endif()
 
-set_property(GLOBAL PROPERTY CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
 add_library(${PROJECT_NAME} SHARED)