//lib.c: #include <stdio.h> const int var_a = 5; const int var_b = 7; void lib_call(void) { printf("a=%i, b=%i\n", var_a, var_b); } //ll //prog.c: #include <stdio.h> #include <stdlib.h> const int var_a = 50; const int var_b = 70; extern void lib_call(void); void prog_call(void) { printf("a=%i, b=%i\n", var_a, var_b); } int main (void) { prog_call(); lib_call(); return EXIT_SUCCESS; } //ll $ cc -Wall -Wextra -g -O2 -shared -o liblib.so lib.c $ cc -Wall -Wextra -g -O2 -o prog prog.c -L. -llib $ LD_LIBRARY_PATH=`pwd` ./prog a=50, b=70 a=5, b=7