Modernize use override

[e-kwsm]

pugixml/CMakeLists.txt

Lines 71 to 79 in 9d7fcbf

	# Set the default C++ standard to C++17 if not set; CMake will automatically downgrade this if the compiler does not support it
	# When CMAKE_CXX_STANDARD_REQUIRED is set, we fall back to C++11 to avoid breaking older compilers
	if (NOT DEFINED CMAKE_CXX_STANDARD_REQUIRED AND NOT DEFINED CMAKE_CXX_STANDARD AND NOT CMAKE_VERSION VERSION_LESS 3.8)
	set(CMAKE_CXX_STANDARD 17)
	set(CMAKE_CXX_STANDARD_REQUIRED OFF)
	elseif (NOT DEFINED CMAKE_CXX_STANDARD)
	set(CMAKE_CXX_STANDARD 11)
	endif()

C++11 or later is necessary, so override must be available.

[zeux]

There seems to be some confusion in the two PRs you opened; to save time, I'll just note here that neither of them will be merged. pugixml documents its portability guarantees here https://pugixml.org/docs/manual.html#install.portability - it does not require C++11 and must be compatible with earlier versions of C++ and compilers. CMake by default uses C++11 to make sure users get access to C++11 (and now 17) features automatically, but you can override that with CMAKE_CXX_STANDARD as well.

[e-kwsm]

Thank you for your review. I understand your point.
But virtual is unnecessary for overloaded function, which is fixed in 081e8a3.

Would you reopen this? I will revert the other commits.

[zeux]

Feel free to resubmit just that commit as a separate PR.