[boost] [Context] Compile Broken for MSVC under x64 (r77477 Trunk)

Subject: [boost] [Context] Compile Broken for MSVC under x64 (r77477 Trunk)
From: Joshua Boyce (raptorfactor_at_[hidden])
Date: 2012-03-22 21:02:09

r77477 has broken compilation of Boost.Context on trunk for me when using
MSVC and targeting x64 (it spits out a "platform not supported" error).

I believe this is because MSVC does not define any of the preprocessor
directives that are being checked now (instead of _WIN64).

I believe the fix for this is to check _M_AMD64 and/or _M_X64.

http://msdn.microsoft.com/en-us/library/b0084kay(v=vs.110).aspx
_M_X64: Defined for x64 processors.
_M_AMD64: Defined for x64 processors.

This patch fixes the issue for me:
http://dl.dropbox.com/u/74751/cpp/boost/patches/context-msvc-x64-fix-20120323-1201.patch

Thanks.