The World's Shortest Hello World

I don't remember where I read this, but it's in C, and here's the deal:

1. Create a file called void main(){puts("Hello, World!");}, assuming your filesystem will allow it.
2. Its contents should be:
   __FILE__

3. Compile it with -istdio.h

Quite clever. Although gcc won't let you compile it without a file extension.

Update I was talking this over with Bozyo the other day. We decided that you can do it like this: on the command line:

gcc -Df=__FILE__ -Dc=// -istdio.h void*.c, then add a "c .c" to the filename and change the content to "f".

There is only one way to make a Hello World program shorter than that.

Add -DA=__FILE__ to the gcc args, and change the source file's contents to just A.

That's the shortest Hello World program possible, as it's just one byte in size.