[CMake] Building for 64 bit with Visual Studio 2013

[Scott Aron Bloom]

We have been building for 32 bits on windows, and 64 bit on linux and OSX for a while.

In order to enable this, we have a simple function that uses CMAKE_SIZEOF_VOID_P to add a define via add_defintions

However, we are now going to build for windows 64, I calling vsvarsall.bat with x64 as a parameter, however, the CMAKE_SIZEOF_VOID_P still is equal to 4.

Any idea on what Im missing?

Scott
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