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Re: 64 bit Cygwin target and _WIN64


On 2012-07-18 06:03, Corinna Vinschen wrote:
Now comes the time for _WIN64.  _WIN64 is used a *LOT* inside of the
Mingw64 headers to distinguish type definitions which differ from the
32 bit version, or to declare functions which only exist on 64 bit
machines, stuff like that.

There are a couple of ways to help us along with this problem:

1. Replace all

#ifdef _WIN64

with

#if defined (_WIN64) || defined (__CYGWIN64__)

Can't that just be #ifdef __x86_64__?


Also, I would suggest avoiding __CYGWIN64__: IIRC we used to use __CYGWIN32__ until M$ trademarked "Win32", leaving us with just __CYGWIN__; what happens if they decide to trademark "Win64"? Instead, this should be __CYGWIN__ && __x86_64__, just like other platforms have separate defines for OS and architecture.

4. Let the Cygwin 64 bit gcc define _WIN64 by default.

No way, for the same reason we don't define _WIN32.



Yaakov



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