Hi Fernande ,

For x86 simulation, you don't need to use cross-compilation. Compile your code using the default compiler founded in ubuntu, i.e., gcc compiler, and the extract the binary code.

$ gcc matmul.c -o binarymm

the binarymm file should be executed on both the host and the x86 simulation.

move the binarymm to your simulation and run it. You need to build the gem5. (opt, fast, debug) binary for x86 to be enable to run this code.