[CMake] Visual Studios platform choice

[Jack Stalnaker]

Hi,

I understand from reading this newgroup (e.g.
https://cmake.org/pipermail/cmake/2013-March/053775.html) that the only way
to support multiple platforms in Visual Studio is to run CMake multiple
times, once for each platform.

I'm porting some linux based code to the Windows world, and the Windows dev
showed me that in Visual Studio, platform choice is a pulldown menu at the
top of the screen. This pulldown appears even if we run CMake without
specifying a 64 bit platform. This is a bit confusing, because we've only
generated a solution and project file for 32 bit. So what happens when
someone selects 64 bit on the pulldown menu? What's being built?

Thanks
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