[CMake] [newbie] Do I have to list all .cpp files explicitly?

[Harlan Wood]

Hi,
 
I'm hoping to find a tool that, given a top-level C++ file, will find
and compile and its dependencies (including headers and source files).
I'm brand new to CMake and wondering if I have to list all .cpp files
explicitly?  
 
I have simplified the CMake "hello world" example to demonstrate what I
want:  I have a "main" class which includes "hello.h" -- is there a way
to suggest to CMake that it look for hello.cpp in the same location?
 
Source files below.  CMake version 2.4-patch 3 under cygwin.
 
Thanks for any help!
Harlan 

 
____________________________
 
# CMakeLists.txt:
 
# add_executable (helloDemo main.cxx hello.cxx)   # succeeds
add_executable (helloDemo main.cxx)               # fails with message:
CMakeFiles/helloDemo.dir/main.o:main.cxx:(.text+0x31): undefined
reference to `Hello::Print()'
 
____________________________
 
// main.cxx: 
 
#include "hello.h"
 
int main()
{
  Hello hello;
  hello.Print();
  return 0;
}

____________________________
 
// hello.h: 
 
#ifndef _hello_h
#define _hello_h
 
class Hello
{
public:
  void Print();
};
 
#endif

____________________________
 
// hello.cxx: 
 
#include "hello.h"
#include <stdio.h>
 
void Hello::Print()
{
  printf("Hello, World!\n");
}

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