Runtimes: install the .swiftdoc interface as well

This is part of the development component for the module and is part of
the interface definition. This content is consumed by the user during
development.

Author: compnerd

Runtimes/Core/cmake/modules/InstallSwiftInterface.cmake

@@ -36,4 +36,16 @@ function(install_swift_interface target)
         COMPONENT SwiftCore_development)
     endif()
   endif()
+
+  # Install Swift documentation interface files.
+  install(FILES "${CMAKE_CURRENT_BINARY_DIR}/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.swiftdoc"
+    RENAME "${SwiftCore_MODULE_TRIPLE}.swiftdoc"
+    DESTINATION "${SwiftCore_INSTALL_SWIFTMODULEDIR}/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.swiftmodule"
+    COMPONENT SwiftCore_development)
+  if(SwiftCore_VARIANT_MODULE_TRIPLE)
+    install(FILES "${CMAKE_CURRENT_BINARY_DIR}/${target}-${SwiftCore_VARIANT_MODULE_TRIPLE}/${target}.swiftdoc"
+      RENAME "${SwiftCore_VARIANT_MODULE_TRIPLE}.swiftdoc"
+      DESTINATION "${SwiftCore_INSTALL_SWIFTMODULEDIR}/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.swiftmodule"
+      COMPONENT SwiftCore_development)
+  endif()
 endfunction()

Runtimes/Overlay/cmake/modules/InstallSwiftInterface.cmake

@@ -31,4 +31,16 @@ function(install_swift_interface target)
         DESTINATION "${SwiftOverlay_INSTALL_SWIFTMODULEDIR}/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.swiftmodule")
     endif()
   endif()
+
+  # Install Swift documentation interface files.
+  install(FILES "${CMAKE_CURRENT_BINARY_DIR}/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.swiftdoc"
+    RENAME "${SwiftOverlay_MODULE_TRIPLE}.swiftdoc"
+    DESTINATION "${SwiftOverlay_INSTALL_SWIFTMODULEDIR}/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.swiftmodule"
+    COMPONENT SwiftOverlay_development)
+  if(SwiftOverlay_VARIANT_MODULE_TRIPLE)
+    install(FILES "${CMAKE_CURRENT_BINARY_DIR}/${target}-${SwiftOverlay_VARIANT_MODULE_TRIPLE}/${target}.swiftdoc"
+      RENAME "${SwiftOverlay_VARIANT_MODULE_TRIPLE}.swiftdoc"
+      DESTINATION "${SwiftOverlay_INSTALL_SWIFTMODULEDIR}/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.swiftmodule"
+      COMPONENT SwiftOverlay_development)
+  endif()
 endfunction()

Runtimes/Supplemental/cmake/modules/InstallSwiftInterface.cmake

@@ -36,4 +36,16 @@ function(install_swift_interface target)
         COMPONENT ${PROJECT_NAME}_development)
     endif()
   endif()
+
+  # Install Swift documentation interface files.
+  install(FILES "${CMAKE_CURRENT_BINARY_DIR}/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.swiftdoc"
+    RENAME "${${PROJECT_NAME}_MODULE_TRIPLE}.swiftdoc"
+    DESTINATION "${${PROJECT_NAME}_INSTALL_SWIFTMODULEDIR}/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.swiftmodule"
+    COMPONENT ${PROJECT_NAME}_development)
+  if(SwiftCore_VARIANT_MODULE_TRIPLE)
+    install(FILES "${CMAKE_CURRENT_BINARY_DIR}/${target}-${${PROJECT_NAME}_VARIANT_MODULE_TRIPLE}/${target}.swiftdoc"
+      RENAME "${${PROJECT_NAME}_VARIANT_MODULE_TRIPLE}.swiftdoc"
+      DESTINATION "${${PROJECT_NAME}_INSTALL_SWIFTMODULEDIR}/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.swiftmodule"
+      COMPONENT ${PROJECT_NAME}_development)
+  endif()
 endfunction()