I tried to compile dosbox 0.74 with debug feature using gcc 4.9.2, and I am getting the following error (not exact, from memory):

src/debug/debug.cpp error: LOG(..)(out1) not literal string ...

I had to fix this by getting rid of out1 variable and sprintf() function call and just applying the formatting string and parameters directly in LOG()().

Maybe we shouldn't use temporary out1 character array in forming log messages at all? I don't see any advantage of doing that other than wasting 512 bytes of memory. I'm attaching a patch file for review.