cl6x -c -o does not rename object files

I have C6000 Code Generation Tools 7.4.2 for Windows (and have verified same behavior back to 7.2.4).

If I do

cl6x.exe -mv6600 -c -o foo.obj temp.c

I expect it to create foo.obj.  But it creates temp.obj.

Edit: I Guess I see it says -o is only a linker option.