Add rudimentary support for the Apple Swift language with Xcode

Allow the `Swift` language to be enabled with the Xcode generator for
Xcode >= 6.1.  Reject it on other generators and with older Xcode
versions.  Since Apple is the only vendor implementing the language
right now, the compiler id can be just `Apple`.

1 files changed, 41 insertions, 0 deletions

diff --git a/Modules/CMakeSwiftInformation.cmake b/Modules/CMakeSwiftInformation.cmake
new file mode 100644
index 0000000000..61ad928341
--- /dev/null
+++ b/Modules/CMakeSwiftInformation.cmake
@@ -0,0 +1,41 @@
+
+#=============================================================================
+# Copyright 2004-2015 Kitware, Inc.
+#
+# Distributed under the OSI-approved BSD License (the "License");
+# see accompanying file Copyright.txt for details.
+#
+# This software is distributed WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the License for more information.
+#=============================================================================
+# (To distribute this file outside of CMake, substitute the full
+#  License text for the above reference.)
+
+set(CMAKE_Swift_OUTPUT_EXTENSION .o)
+
+# Load compiler-specific information.
+if(CMAKE_Swift_COMPILER_ID)
+  include(Compiler/${CMAKE_Swift_COMPILER_ID}-Swift OPTIONAL)
+endif()
+
+# load the system- and compiler specific files
+if(CMAKE_Swift_COMPILER_ID)
+  # load a hardware specific file, mostly useful for embedded compilers
+  if(CMAKE_SYSTEM_PROCESSOR)
+    include(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_Swift_COMPILER_ID}-Swift-${CMAKE_SYSTEM_PROCESSOR} OPTIONAL)
+  endif()
+  include(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_Swift_COMPILER_ID}-Swift OPTIONAL)
+endif()
+
+# for most systems a module is the same as a shared library
+# so unless the variable CMAKE_MODULE_EXISTS is set just
+# copy the values from the LIBRARY variables
+if(NOT CMAKE_MODULE_EXISTS)
+  set(CMAKE_SHARED_MODULE_Swift_FLAGS ${CMAKE_SHARED_LIBRARY_Swift_FLAGS})
+  set(CMAKE_SHARED_MODULE_CREATE_Swift_FLAGS ${CMAKE_SHARED_LIBRARY_CREATE_Swift_FLAGS})
+endif()
+
+include(CMakeCommonLanguageInclude)
+
+set(CMAKE_Swift_INFORMATION_LOADED 1)