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, 53 insertions, 0 deletions

diff --git a/Modules/CMakeDetermineSwiftCompiler.cmake b/Modules/CMakeDetermineSwiftCompiler.cmake
new file mode 100644
index 0000000000..bff1ae9cd0
--- /dev/null
+++ b/Modules/CMakeDetermineSwiftCompiler.cmake
@@ -0,0 +1,53 @@
+
+#=============================================================================
+# Copyright 2002-2015 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.)
+
+include(${CMAKE_ROOT}/Modules/CMakeDetermineCompiler.cmake)
+
+if("${CMAKE_GENERATOR}" STREQUAL "Xcode")
+  if(XCODE_VERSION VERSION_LESS 6.1)
+    message(FATAL_ERROR "Swift language not supported by Xcode ${XCODE_VERSION}")
+  endif()
+  set(CMAKE_Swift_COMPILER_XCODE_TYPE sourcecode.swift)
+  _cmake_find_compiler_path(Swift)
+else()
+  message(FATAL_ERROR "Swift language not supported by \"${CMAKE_GENERATOR}\" generator")
+endif()
+
+# Build a small source file to identify the compiler.
+if(NOT CMAKE_Swift_COMPILER_ID_RUN)
+  set(CMAKE_Swift_COMPILER_ID_RUN 1)
+
+  list(APPEND CMAKE_Swift_COMPILER_ID_MATCH_VENDORS Apple)
+  set(CMAKE_Swift_COMPILER_ID_MATCH_VENDOR_REGEX_Apple "com.apple.xcode.tools.swift.compiler")
+
+  set(CMAKE_Swift_COMPILER_ID_TOOL_MATCH_REGEX "\nCompileSwiftSources[^\n]*(\n[ \t]+[^\n]*)*\n[ \t]+([^ \t\r\n]+)[^\r\n]* -c[^\r\n]*CompilerIdSwift/CompilerId/main.swift")
+  set(CMAKE_Swift_COMPILER_ID_TOOL_MATCH_INDEX 2)
+
+  # Try to identify the compiler.
+  set(CMAKE_Swift_COMPILER_ID)
+  include(${CMAKE_ROOT}/Modules/CMakeDetermineCompilerId.cmake)
+  CMAKE_DETERMINE_COMPILER_ID(Swift "" CompilerId/main.swift)
+endif()
+
+if (NOT _CMAKE_TOOLCHAIN_LOCATION)
+  get_filename_component(_CMAKE_TOOLCHAIN_LOCATION "${CMAKE_Swift_COMPILER}" PATH)
+endif ()
+
+include(CMakeFindBinUtils)
+
+# configure variables set in this file for fast reload later on
+configure_file(${CMAKE_ROOT}/Modules/CMakeSwiftCompiler.cmake.in
+  ${CMAKE_PLATFORM_INFO_DIR}/CMakeSwiftCompiler.cmake
+  @ONLY
+  )