Re: Support of gdb for Windows 64 native systems

[Joel Brobecker <brobecker@adacore.com>]

[moved to gdb-patches as well]

> What's done:
> 
> 	- Added mingw.mh, mingw.mt as copies from the cygwin files.
> 	- Updated configure.tgt to set gdb_target.
> 	- Disabled cygwin specific functionality in win32-nat.c.  As can
> 	be seen, the changes are very small.
> 	- profs.h isn't needed anymore, since I've implemented cygwin 
> 	cross-core support a few weeks ago (in i386-cygwin-tdep.c).
>       The include can be unconditionally removed.

Nice!

> What's next:
> 
> 	Test with a mingw built libexpat to test dll support.

Done. Seems to be working well:

    (top-gdb) info dll
    From        To          Syms Read   Shared Object Library
    0x7c901000  0x7c9afe88  Yes         C:\WINDOWS\system32\ntdll.dll
    0x7c801000  0x7c8f4bec  Yes         C:\WINDOWS\system32\kernel32.dll
    0x77c11000  0x77c67d74  Yes         C:\WINDOWS\system32\msvcrt.dll
    0x7e411000  0x7e49fde8  Yes         C:\WINDOWS\system32\user32.dll
    0x77f11000  0x77f568a0  Yes         C:\WINDOWS\system32\gdi32.dll
    0x71ab1000  0x71ac6dc8  Yes         C:\WINDOWS\system32\ws2_32.dll
    0x71aa1000  0x71aa7324  Yes         C:\WINDOWS\system32\ws2help.dll
    0x77dd1000  0x77e6ab38  Yes         C:\WINDOWS\system32\advapi32.dll
    0x77e71000  0x77f003f8  Yes         C:\WINDOWS\system32\rpcrt4.dll

> 	Rename a few things, which really aren't cygwin specific, like:
> 		* cygwin_get_dr6 -> win32_get_dr6
> 		* i386-cygwin-tdep.h -> i386-win32-tdep.h
> 		* nm-cygwin.h -> nm-cygming.h

I propose we use "windows" instead of either "win32" or "cygming".
It seems more descriptive to me, and also avoids the "32", since
eventually we might want to add support for 64-bit windows....

-- 
Joel