1) Go produces 100% portable code. I absolutely suffered doing the same for a very basic C++ program that used C++11's std::regex. Compiled fine on clang-3.5 on OS X, fails on clang on Linux. It took me hours of searching online to find and install the exact version of GCC that actually fills in std::regex instead of just keeping it empty. Trust me, there are some versions that do that! No errors during compilation, but still doesn't run.

2) Statically compiled binaries. I can be confident that the absence of some essential library from the user's end won't break my app.

3) Cross-platform, especially with something like Qt. Write once, compile for each OS, then run - done!