Using size-optimization with gcc . – free-tutorials.org news free tutorials source code development scripts

We use a simple hello program. Type the following program into your favorite editor.

#include 
int main()
{
 printf("Hello world\n");
 return 0;
}

#include

int main()

{

printf("Hello world\n");

return 0;

}

We don’t want to debug our intro. We compile it using size-optimization and no frame-pointers.

 $ gcc -Os -fomit-frame-pointer test001.c -o test001

1	$ gcc -Os -fomit-frame-pointer test001.c -o test001

Let’s see how big it executable.

$ ls -l test001
... 9043 2012-05-19 17:39 test001

1 2	$ ls -l test001 ... 9043 2012-05-19 17:39 test001

We have about 9043 bytes.

We’ll strip the executable and remove useless information. The strip command discard symbols from object files.

$ strip -s -R .comment -R .gnu.version test001

1	$ strip -s -R .comment -R .gnu.version test001

Let’s see how big it’s now.

$ ls -l test001
... 5300 2012-05-19 17:41 test001

1 2	$ ls -l test001 ... 5300 2012-05-19 17:41 test001

Now we have about 5300 bytes.

With sstrip part of the package ELFkickers, we can save about 1k.

$ sstrip test001

1	$ sstrip test001

You can test it.