Tests/RunCMake/InterfaceLibrary/ConfigSources.cmake - third_party/github.com/Kitware/CMake - Git at Google

 # Test an interface library added to the build system by a per-config source.
 add_library(iface INTERFACE $<$<CONFIG:NotAConfig>:${CMAKE_CURRENT_SOURCE_DIR}/iface.c>)
	# Test an interface library added to the build system by a per-config source.
	add_library(iface INTERFACE $<$<CONFIG:NotAConfig>:${CMAKE_CURRENT_SOURCE_DIR}/iface.c>)