Re: mkmf enhancement for Win32

Hi,

At Sat, 11 Dec 2004 07:10:54 +0900,
Berger, Daniel wrote in [ruby-core:03944]:
> It turns out that some Win32 functions, such as AttachConsole(), are
> only conditionally available, and depend on the values of specific
> macros.
> 
> From
> http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winprog
> /winprog/using_the_windows_headers.asp
> 
> "Certain functions that depend on a particular version of Windows are
> declared using conditional code. This enables you to use the compiler to
> detect whether your application uses functions that are not supported on
> its target version(s) of Windows. To compile an application that uses
> these functions, you must define the appropriate macros. Otherwise, you
> will receive the C2065 error message."

It doesn't seem meaningful to check the compiling environment.
Rather you should check the target, the environment to run that
extension, no?

> This will be more of an issue when 64-bit Windows becomes more popular,
> though I am even hitting it currently with some of the Win32Utils
> extensions I've been working on.
> 
> Now, we could leave it up to individual extension authors to set this
> themselves manually, but that's a pain, and error prone (it's easy to
> forget, and some may not know to do it in the first place).  I thought
> it would be nice if mkmf would set it for us.  So, I submit the
> following patch for consideration:

I guess that developers who intend to restrict the target
should add such macros by themselves.

-- 
Nobu Nakada