Debug window?

[lurker]

Building with cmake, spring has decided to spawn a second window displaying stdout whenever I run it. This behavior goes back earlier than 77b5, and I couldn't figure out the cause over half an hour of searching revisions, commit log, and registry entries. In short, why does this happen and how bad is it that I completely failed to find any information?

[Tobi]

Maybe cmake doesn't pass -mwindows or similar flag to GCC linker, to instruct it's Windows GUI app and not console app?