Statically linking .o files with gcc

gcc-static.min.sh

#!/bin/sh
set -e

cat > libtest.c <<EOF

#include <stdio.h>

void test_function(int arg)
{
  printf("Calling test_function(%d)\n", arg);
}
EOF

cat > test.c <<EOF

#include <stdio.h>

// provided by libtest.c
void test_function(int arg);

int main(int argc, char * argv[])
{
  printf("Calling a library function\n");
  
  test_function(42);

  return 0;
}
EOF

# Compile and pack the library
# Make sure to include '-c' to prevent linking
gcc -o libtest.o -c libtest.c

echo "Packed object files:"
ar cvr libtest.a libtest.o

# Now statically link the library
gcc -o test test.c -L${PWD} -ltest

echo -e "\nLibraries used:"
ldd test

echo -e "\nResult:"
./test