How we were upgrading compiler and supporting cross-platform software

For a long time, for our codebase containing 2M lines of code and depending on 80 third-party libraries (including MFC) we had been using С++11 in Visual Studio 2013 (only for Windows). Now we're using С++17 in Visual Studio 2017 (for Windows) and GCC 7.3 (for Linux). We'll tell how we solved different challenges that appeared during this transition:

• Proving to our senior officials that this transition is worth it
• Using the Conan package manager for third-party libraries assembly
• VS2017 interaction with CMake and Linux
• Achieving build reproducibility with the constant updates of VS2017
• Fixing incompatibilities in code that came with update to С++17