| For each toolset that comes with this version of Visual Studio, there are |
| variants that are themselves compiled for 32-bit (x86) and 64-bit (x64) hosts |
| (independent of the architecture they target). By default Visual Studio |
| chooses the 32-bit variant even on a 64-bit host. One may request use of the |
| 64-bit host tools by adding ``host=x64`` to the toolset specification: |
| |
| ``host=x64`` |
| Select the 64-bit variant of the default toolset. |
| ``<toolset>,host=x64`` |
| Select the 64-bit variant of the ``<toolset>`` toolset. |
