python3.functions: support installing Python3 into a bundle

projects/python3.functions.cmake

@@ -16,6 +16,7 @@ function (superbuild_install_superbuild_python3)
 
   set(options)
   set(values
+    BUNDLE
     LIBSUFFIX)
   set(multivalues
     MODULES)
@@ -240,6 +241,28 @@ function (superbuild_install_superbuild_python3)
       DESTINATION "bin"
       COMPONENT "superbuild")
 
+  elseif (APPLE)
+    superbuild_apple_install_python(
+      "\${CMAKE_INSTALL_PREFIX}"
+      "${_install_superbuild_python_BUNDLE}"
+      MODULES             ${modules} ${_install_superbuild_python_MODULES}
+      MODULE_DIRECTORIES  "${superbuild_install_location}/lib/python${superbuild_python_version}"
+                          "${superbuild_install_location}/lib/python${superbuild_python_version}/lib-dynload"
+      PYTHON_DESTINATION  "Contents/Libraries/lib/python${superbuild_python_version}")
+
+    # fixup and install everything under lib-dynload.
+    # fixup is needed to ensure that any dependencies for these libraries are
+    # installed. this also ensures rpaths etc are fixed up correctly.
+    file(GLOB so_names
+      "${superbuild_install_location}/lib/python${superbuild_python_version}/lib-dynload/*.so")
+    foreach (so_name IN LISTS so_names)
+      superbuild_apple_install_module(
+        "\${CMAKE_INSTALL_PREFIX}"
+        "${_install_superbuild_python_BUNDLE}"
+        "${so_name}"
+        "Contents/Libraries/lib/python${superbuild_python_version}"
+        LOADER_PATHS "${superbuild_install_location}/lib")
+    endforeach ()
   else ()
     superbuild_unix_install_python(
       MODULE_DESTINATION  "/"