1. vi functions.c
[codesyntax lang=”c”]
#include <stdio.h> void hello_world(void) { printf("hello world!!\n"); }
[/codesyntax]
2. vi hello.c
[codesyntax lang=”c”]
#include <stdio.h> #include <stdlib.h> void hello_world(void); int main(int argc, char **argv) { hello_world(); exit(0); }
[/codesyntax]
3. Make Executable hello
[codesyntax lang=”bash”]
# Object Files $ gcc -g -c functions.c hello.c # Executable hello $ gcc -g -o hello functions.o hello.o # Run hello $ ./hello
[/codesyntax]
4. To make functions shared
[codesyntax lang=”bash”]
# create functions.o $ gcc -fPIC -c functions.c # Create functions.so $ gcc -shared -o libfuc.so functions.o # Make libfuc.so shared $ mv libfuc.so /lib/ # Link libfuc.so to output $ gcc -o hello -lfuc hel.c # to see the libraries linked $ ldd hello $ ./hello
[/codesyntax]