title: Cannot generate 32 bit configuration for Visual Studio 2019 with host=x86 or -A Win32
body: <p>I am trying to configure cmake to build for 32bit and 64bit separately...     </p>
  
  <p>So far 64bit is easy as I just need to add -A x64</p>
  
  <pre><code>cmake -G "Visual Studio 16 2019" -A x64
  </code></pre>
  
  <p>But I am not able to set 32bit arch.
  Official documentation suggest -A Win32 or -T host=x86<br>
  <a href="https://cmake.org/cmake/help/latest/generator/Visual%20Studio%2016%202019.html" rel="nofollow noreferrer">https://cmake.org/cmake/help/latest/generator/Visual%20Studio%2016%202019.html</a><br>
  Even with them I am not able to set x86 host</p>
  
  <p>What I have tried:      </p>
  
  <pre><code>cmake -G "Visual Studio 16 2019" -DCMAKE_GENERATOR_PLATFORM=x86
  
  cmake -G "Visual Studio 16 2019" -A Win32
  
  cmake -G "Visual Studio 16 2019" -A Win32 -T host=x86
  
  cmake -G "Visual Studio 16 2019" -A Win32 host=x86
  </code></pre>
  
  <p>Nothing is working, Here is log I am getting all the time...     </p>
  
  <pre><code>-- Selecting Windows SDK version 10.0.18362.0 to target Windows 10.0.18363.
  -- The C compiler identification is MSVC 19.25.28612.0
  -- The CXX compiler identification is MSVC 19.25.28612.0
  -- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.25.28610/bin/Hostx64/x64/cl.exe
  -- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.25.28610/bin/Hostx64/x64/cl.exe -- works
  -- Detecting C compiler ABI info
  -- Detecting C compiler ABI info - done
  -- Detecting C compile features
  -- Detecting C compile features - done
  -- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.25.28610/bin/Hostx64/x64/cl.exe
  </code></pre>