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I've been working to get rid of the last few warnings from my program and found one that seems to be caused by irrlicht, I thought I'd mention it in case anyone else agrees with me.
line 695 in irrString.h:
for (s32 i=0; i<used-len; ++i)
that line is giving me a unsigned and signed integer comparison warning (i'm using mingw) and it looks to me like there is no reason that "i" should be a signed integer, so I changed it to:
for (u32 i=0; i<used-len; ++i)
...and everything works just the same but does not give the error anymore.