# -fPIC and -fPIE conflict with each other and -fPIE is not necessary for # libraries. gcc -D_FORTIFY_SOURCE=2 -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security test.c -fPIC -DPIC -o libtest.o gcc -shared -fPIC -DPIC libtest.o -lpthread -O2 -Wl,relro -Wl,now -Wl,--as-needed -o libtest.so