How to link a "hello.o" object file manually using ld.exe?

["Fei Chen" <chenfei at gmail dot com>]

Hello, dear authors of MinGW,

I just have one question about the linker, ld.exe. I would greatly
appreciate it if you could explain it a bit to me.

The thing is I already have a "hello.o" generated by as.exe, and want
to link this object file manually by using ld.exe instead of gcc.exe.
But I don't know what else .o and .a library files I should link
together with this "hello.o". The source code is extremely simple with
only one printf message.

FYI, below is the output information when I tried to link the "hello.o" alone.
D:\MinGW>ld -o hello hello.o
hello.o:hello.c:(.text+0x21): undefined reference to `_alloca'
hello.o:hello.c:(.text+0x26): undefined reference to `__main'
hello.o:hello.c:(.text+0x32): undefined reference to `printf'

So, what .o and .a files should I link together? BTW, I am using
WindowsXP. Thanks in advance for any help.

Fei

/*     Source Code of hello.c     */
#include <stdio.h>
int main()
{
  printf("Hello, world!\n");
  return 0;
}