Hello > -c ../../llvm-gcc-4.8/gcc/crtstuff.c -DCRT_BEGIN \ > -o crtbegin.o > C:/MinGW/llvm/arm_objects/gcc/as: line 2: exec: -o: invalid option You don't have cross ARM binutils installed. -- With best regards, Anton Korobeynikov Faculty of Mathematics and Mechanics, Saint Petersburg State University