Proof of concept Shared libraries on Linux

poc_shared_libraries.sh

nano sqrttest.c
  /* sqrttest.c */
  #include <math.h>
  #include <stdio.h>
  int main(void)
  {
    printf("%g\n", sin(3.141592654/2.0));
    return 0;
  }
#save the script

#Now compile it without shared libraries
gcc -static sqrttest.c -lm -o sqrttest-static

#run the binary
./sqrttest-static

#check the size of static binary
ls -lh sqrttest-static

#Compile the program with shared libraries
gcc sqrttest.c -lm -o sqrttest-dynamic

#run the binary
./sqrttest-dynamic

#check the size of binary with dynamic libraries
ls -lh sqrttest-dynamic

#Let's conclude that Shared Libraries are very important thing
#in optimize an application and manage code efficiently.

#check shared libraries used by a binary
ldd sqrttest-dynamic
ldd sqrttest-static

#end of poc