Installing anything on a target computer is not an option (particularly something old like WinXP where you don't know what will happen as a result) so Visual Studio is something I avoid using. Maybe an older version of Visual Studio? I prefer MinGW because it doesn't have the problems with missing redistributables when you try to run your program on different machines. I don't know if Visual Studio 2013 will complain about WinXP SP2 but if it requires SP3 to even install then you might have to go with MinGW instead. I suspect Qt 5.6.3 will work in this setup (I haven't upgraded yet because of the amount of work and lack of problems with 5.6.0).

The key options when compiling Qt are the configure options '-target xp' and '-no-directwrite'. My solution is Qt 5.6.0 compiled from source on a virtual machine running WinXP SP2. I need to make sure the programs work on WinXP as I find many places still have this software. Is there a better way to do so? I'm fine with trying other versions of Qt and/or MSVC, just not too old as I'm afraid I won't be able to build the program using them. I guess it counts as a workaround, but my goal is to make a portable piece of software that runs with minimal hassle without requiring to install additional components.

If I build the application with QT 5.6.3 and MSVC 2015, it requires MS Visual C++ 2015 Redistributable, which in turn needs MS Windows Installer 4.5 (KB 942288 v3) to be installed in order to run on XP SP2. On XP SP2 I get the following error: 'The procedure entry point GetLogicalProcessorInformation could not be located in the dynamic link library KERNE元2.dll'. dll files in (along with msvcp120.dll and msvcr120.dll), it runs just fine on WinXP SP3. So far, when I build the application and drop Qt. I don't consider it reasonable to tell them to upgrade just to be able to use my software. Problem is, I want other local companies/facilities to benefit from the things I'm creating. With enough time and effort this could be done. The obvious solution would be to install SP3 on each and every of these PCs. Upgrading the system to Win7 or newer is not an option: some of these rigs boast 1 GB of RAM and are generally weak. For example, our accounting office has WinXP on every PC, human resources office has a machine with XP installed, et cetera.

The reason is that I live and work in a fairly rural place, and organizations around here still use WinXP a lot. I currently use QT 5.6.3 with MSVC 2013 and am required to make an open source application that works on Windows XP SP2.

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