How to detect if 64 bit MSVC with cmake?

Question

I have a project which uses cmake, one target is set to only build with MSVC:

 if (MSVC)
     add_library(test SHARED source.cpp) 
 endif()

Answer 1

This example worked for me on cmake 3.17.0:

if("${CMAKE_GENERATOR_PLATFORM}" STREQUAL "x64")
  ....
endif()

if("${CMAKE_GENERATOR_PLATFORM}" STREQUAL "Win32")
  ...
endif()