How do I change the startup project of a Visual Studio solution via CMake?

CMake now supports this with versions 3.6 and higher through the VS_STARTUP_PROJECT directory property:

cmake_minimum_required(VERSION 3.6)
project(foo)
# ...

add_executable(bar ${BAR_SOURCES})
set_property(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} PROPERTY VS_STARTUP_PROJECT bar)

This will set bar as the startup project for the foo.sln solution.

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