trying to compile files for static lib, failes?

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I have 3 source files called xyz1.c xyz2.c xyz3.c, also include directory parallel to these files, I need to compile them and create a static lib with this command, not working, any issue?

gcc -g -O2 -I/include -o util.lib xyz1.c xyz2.c xyz.c

later I need to use util.lib to create dll, any command?.