cmake/modules/SwiftSupport.cmake

include(CMakeParseArguments)

function(add_swift_target target)
  set(options LIBRARY)
  set(single_value_options MODULE_NAME;MODULE_LINK_NAME;MODULE_PATH;MODULE_CACHE_PATH;OUTPUT;TARGET)
  set(multiple_value_options CFLAGS;DEPENDS;LINK_FLAGS;SOURCES;SWIFT_FLAGS)

  cmake_parse_arguments(AST "${options}" "${single_value_options}" "${multiple_value_options}" ${ARGN})

  set(flags ${CMAKE_SWIFT_FLAGS})
  set(link_flags)

  if(AST_TARGET)
    list(APPEND flags -target;${AST_TARGET})
  endif()
  if(AST_MODULE_NAME)
    list(APPEND flags -module-name;${AST_MODULE_NAME})
  else()
    list(APPEND flags -module-name;${target})
  endif()
  if(AST_MODULE_LINK_NAME)
    list(APPEND flags -module-link-name;${AST_MODULE_LINK_NAME})
  endif()
  if(AST_MODULE_CACHE_PATH)
    list(APPEND flags -module-cache-path;${AST_MODULE_CACHE_PATH})
  endif()
  if(AST_SWIFT_FLAGS)
    foreach(flag ${AST_SWIFT_FLAGS})
      list(APPEND flags ${flag})
    endforeach()
  endif()
  if(AST_CFLAGS)
    foreach(flag ${AST_CFLAGS})
      list(APPEND flags -Xcc;${flag})
    endforeach()
  endif()
  if(AST_LINK_FLAGS)
    foreach(flag ${AST_LINK_FLAGS})
      list(APPEND link_flags ${flag})
    endforeach()
  endif()
  if(NOT AST_OUTPUT)
    if(AST_LIBRARY)
      set(AST_OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${target}.dir/${CMAKE_SHARED_LIBRARY_PREFIX}${target}${CMAKE_SHARED_LIBRARY_SUFFIX})
    else()
      set(AST_OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${target}.dir/${target}${CMAKE_EXECUTABLE_SUFFIX})
    endif()
  endif()

  set(sources)
  foreach(source ${AST_SOURCES})
    get_filename_component(location ${source} PATH)
    if(IS_ABSOLUTE ${location})
      list(APPEND sources ${source})
    else()
      list(APPEND sources ${CMAKE_CURRENT_SOURCE_DIR}/${source})
    endif()
  endforeach()

  set(objs)
  set(mods)
  set(docs)
  set(i 0)
  foreach(source ${sources})
    get_filename_component(name ${source} NAME)

    set(obj ${CMAKE_CURRENT_BINARY_DIR}/${target}.dir/${name}${CMAKE_C_OUTPUT_EXTENSION})
    set(mod ${CMAKE_CURRENT_BINARY_DIR}/${target}.dir/${name}.swiftmodule)
    set(doc ${CMAKE_CURRENT_BINARY_DIR}/${target}.dir/${name}.swiftdoc)

    set(all_sources ${sources})
    list(INSERT all_sources ${i} -primary-file)

    add_custom_command(OUTPUT
                         ${obj}
                         ${mod}
                         ${doc}
                       DEPENDS
                         ${source}
                       COMMAND
                         ${CMAKE_SWIFT_COMPILER} -frontend ${flags} -emit-module-path ${mod} -emit-module-doc-path ${doc} -o ${obj} -c ${all_sources})

    list(APPEND objs ${obj})
    list(APPEND mods ${mod})
    list(APPEND docs ${doc})

    math(EXPR i "${i}+1")
  endforeach()

  if(AST_LIBRARY)
    get_filename_component(module_directory ${AST_MODULE_PATH} DIRECTORY)

    set(module ${AST_MODULE_PATH})
    set(documentation ${module_directory}/${AST_MODULE_NAME}.swiftdoc)

    add_custom_command(OUTPUT
                         ${module}
                         ${documentation}
                       DEPENDS
                         ${mods}
                         ${docs}
                       COMMAND
                         ${CMAKE_SWIFT_COMPILER} -frontend ${flags} -sil-merge-partial-modules -emit-module ${mods} -o ${module} -emit-module-doc-path ${documentation})
  endif()

  if(AST_LIBRARY)
    set(emit_library -emit-library)
  endif()
  add_custom_command(OUTPUT
                       ${AST_OUTPUT}
                     DEPENDS
                       ${objs}
                     COMMAND
                       ${CMAKE_SWIFT_COMPILER} ${emit_library} ${link_flags} -o ${AST_OUTPUT} ${objs}
                     COMMAND
                       ${CMAKE_COMMAND} -E copy ${AST_OUTPUT} ${CMAKE_CURRENT_BINARY_DIR})
  add_custom_target(${target}
                    ALL
                    DEPENDS
                       ${AST_OUTPUT}
                       ${module}
                       ${documentation})
endfunction()

function(add_swift_library library)
  add_swift_target(${library} LIBRARY ${ARGN})
endfunction()

function(add_swift_executable executable)
  add_swift_target(${executable} ${ARGN})
endfunction()