find_program(swiftc "swiftc" REQUIRED
             HINTS /opt/swift/bin
                   $ENV{SWIFT_ROOT}/bin
                   /usr/local/swift/bin)

if(APPLE)
  set(swopts -Xlinker -stack_size -Xlinker 0x8000000)
else()
  set(swopts "")
endif()  

set(sources cfold.swift deriv.swift rbtree.swift nqueens.swift)
foreach (source IN LISTS sources)
  get_filename_component(name "${source}" NAME_WE)
  set(name "sw-${name}")

  add_custom_command(
    OUTPUT  ${name}
    COMMAND ${swiftc} -O -whole-module-optimization  -o ${name} ${swopts} "$<SHELL_PATH:${CMAKE_CURRENT_SOURCE_DIR}/${source}>"
    DEPENDS ${source}
    VERBATIM)

  add_custom_target(update-${name} ALL DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${name})

  add_executable(${name}-exe IMPORTED)
  set_target_properties(${name}-exe PROPERTIES IMPORTED_LOCATION "${CMAKE_CURRENT_BINARY_DIR}/${name}")

  add_test(NAME ${name} COMMAND ${name}-exe)
  set_tests_properties(${name} PROPERTIES LABELS swift)
endforeach ()