[Exp PyROOT] Disable strict-aliasing warnings

The warnings are triggered by the use of the Py_RETURN_TRUE and
Py_RETURN_FALSE macros of the Python C API. The use of such macros
is necessary and cannot be worked around.

The option is disabled on Windows since it does not exist.

bindings/pyroot_experimental/PyROOT/CMakeLists.txt

@@ -62,6 +62,11 @@ endforeach()
 ROOT_LINKER_LIBRARY(ROOTPython ${sources} LIBRARIES Core Tree cppyy)
 ROOT_INSTALL_HEADERS(inc)
 
+# Disables warnings caused by Py_RETURN_TRUE/Py_RETURN_FALSE
+if(NOT MSVC)
+    target_compile_options(ROOTPython PRIVATE -Wno-strict-aliasing)
+endif()
+
 # Disables warnings originating from deprecated register keyword in Python
 if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" AND CMAKE_CXX_STANDARD GREATER_EQUAL 11)
     target_compile_options(ROOTPython PRIVATE -Wno-register)