64 bit Cygwin target and _WIN64

[Charles Wilson]

On 7/18/2012 7:03 AM, Corinna Vinschen wrote:
> 3. In a core Mingw64 header:
>
>      #ifdef __CYGWIN64__
>      #define _WIN64
>      #endif

This is basically what happens with _WIN32 and WIN32, right now, and the 
existing w32api headers (see windef.h).  (And, when you talk of "Mingw64 
headers" with regards to how a cygwin compiler would use them, you 
/must/ be talking about that portion of mingw64 that is "w32api-like" 
and not the parts that are "mingw-runtime-like" correct?)

So, I really don't see that this is any different than the current 
situation: if you #include any w32api headers, you need to be careful in 
your own code about #ifdef _WIN32, and guard it with && 
!defined(__CYGWIN__) unless you want those windows-isms -- and as good 
practice and for clarity, amplify with || defined(__CYGWIN__) if you 
really want those windows-isms, just so some well-meaning chap doesn't 
come along and "fix" it for you later.

I *wish* there was a better way, but at least this is no worse than 
status quo, wrt the current w32api headers.

--
Chuck