Compile Qt 64 bit with OpenSSL using MinGW

This is how we compile Qt and OpenSSL from source. We use a minty fresh Windows 8.1 in a virtual mashine. The only way to compile OpenSSL on Windows that I found is using MSYS2. MSYS2 has a nice package manager so we also use this to build Qt. Download latest 64 bit msys2 package from https://sourceforge.net/projects/msys2/files/Base/x86_64/ and install it to C:\msys64. Start MSYS2 mingw64 from the start menu.

Version Compability.

In it's jump to OpenSSL 1.1.0, there were a lot of changes to OpenSSL which are not compatible to Qt below 5.9 (at time of writing this, support for OpenSSL 1.1.0 was discussed for the future version Qt 5.9). So if you compile Qt 5.8 or lower, get an OpenSSL version 1.0.x.

OpenSSL

First we update package database and install some packages that we will need:

pacman -Sy
pacman -Syuu (Repeat until it says no more packages can be updated. You might need to restart MSYS2.)
pacman -S perl mingw-w64-x86_64-gcc make tar

Now everything is set up for the build. Download the opensSSL sources from https://www.openssl.org/source/ (or install git and check out the lastest version). Next we will untar the sources, and build openSSL. I did this in /home/buildbot/ (the user on the mashine is called buildbot).

tar xvfz openSSL-sources.xxxx.tar.gz
cd openSSL-xxxx
mkdir dist
./Configure --prefix=$PWD/dist no-idea no-mdc2 no-rc5 shared mingw64
make depend && make && make install

OpenSSL is now compiled and installed in the previously created dist/ folder. We will now use this to compile Qt.

Qt

We will compile Qt with openGL in desktop mode. If you want to use a different openGL mode, you might need the windows KIT or the DirectX SDK installed. However, this is not covered here. First, get the sources of Qt from https://www.qt.io/download/ or check them out using git. If you use the installer, we really only need the sources of Qt (and possibly Qt Charts and Qt Data Visualization). Then create a new folder (maybe named "Qt5.x-release" and cd to it. We will create a shadow build in this folder. Next, configure Qt to build in this new folder:

/c/Qt/5.8/Src/configure.bat -release -opensource -opengl dynamic -openssl -IC:/msys64/home/buildbot/openssl-1.0.2j/dist/include -LC:/msys64/home/buildbot/openssl-1.0.2j/dist/lib -IC:/msys64/home/buildbot/directXSDK/Include -LC:/msys64/home/buildbot/directXSDK/Lib/x86
 /c/Qt/5.8/Src/configure -release -opensource -opengl desktop -platform win32-g++ -nomake examples -nomake tests -no-direct2d -skip qt3d -skip qtactiveqt -skip qtandroidextras -skip qtcanvas3d -skip qtconnectivity -skip qtdeclarative -skip qtdoc -skip qtgamepad -skip qtgraphicaleffects -skip qtlocation -skip qtmacextras -skip qtmultimedia -skip qtnetworkauth -skip qtpurchasing -skip qtquickcontrols -skip qtquickcontrols2 -skip qtscript -skip qtscxml -skip qtsensors -skip qtserialbus -skip qtserialport -skip qtspeech -skip qtsvg -skip qttools -skip qttranslations -skip qtvirtualkeyboard -skip qtwayland -skip qtwebchannel -skip qtwebengine -skip qtwebsockets -skip qtwebview -skip qtwinextras -skip qtx11extras -skip qtxmlpatterns

Qt is now conficured with openSSL. Install some more packages and use it to compile Qt.

pacman -S mingw-w64-x86_64-make bison
mingw32-make

Note: If configure seems to do nothing try to delete the configure.cache first. The configure.log can give valuable insight into possible errors.