+# Define options to control the inclusion and default build behavior for
+# components which may not strictly be necessary (tools, runtime, examples, and
+# tests).
+#
+# This is primarily to support building smaller or faster project files.
+option(LLVM_INCLUDE_TOOLS "Generate build targets for the LLVM tools." ON)
+option(LLVM_BUILD_TOOLS
+ "Build the LLVM tools. If OFF, just generate build targets." ON)
+
+option(LLVM_INCLUDE_RUNTIME "Generate build targets for the LLVM runtimes" ON)
+option(LLVM_BUILD_RUNTIME
+ "Build the LLVM runtime libraries. If OFF, just generate build targets." ON)
+
+option(LLVM_BUILD_EXAMPLES
+ "Build the LLVM example programs. If OFF, just generate build targets." OFF)
+option(LLVM_INCLUDE_EXAMPLES "Generate build targets for the LLVM examples" ON)
+
+option(LLVM_BUILD_TESTS
+ "Build LLVM unit tests. If OFF, just generate build targets." OFF)
+option(LLVM_INCLUDE_TESTS "Generate build targets for the LLVM unit tests." ON)
+
+# All options referred to from HandleLLVMOptions have to be specified
+# BEFORE this include, otherwise options will not be correctly set on
+# first cmake run
+include(config-ix)
+
+# By default, we target the host, but this can be overridden at CMake
+# invocation time.
+set(LLVM_DEFAULT_TARGET_TRIPLE "${LLVM_HOST_TRIPLE}" CACHE STRING
+ "Default target for which LLVM will generate code." )
+set(TARGET_TRIPLE "${LLVM_DEFAULT_TARGET_TRIPLE}")
+
+include(HandleLLVMOptions)
+
+# Verify that we can find a Python 2 interpreter. Python 3 is unsupported.
+set(Python_ADDITIONAL_VERSIONS 2.7 2.6 2.5 2.4)
+include(FindPythonInterp)
+if( NOT PYTHONINTERP_FOUND )
+ message(FATAL_ERROR
+"Unable to find Python interpreter, required for builds and testing.
+
+Please install Python or specify the PYTHON_EXECUTABLE CMake variable.")
+endif()
+
+######
+# LLVMBuild Integration
+#
+# We use llvm-build to generate all the data required by the CMake based
+# build system in one swoop:
+#
+# - We generate a file (a CMake fragment) in the object root which contains
+# all the definitions that are required by CMake.
+#
+# - We generate the library table used by llvm-config.
+#
+# - We generate the dependencies for the CMake fragment, so that we will
+# automatically reconfigure outselves.
+
+set(LLVMBUILDTOOL "${LLVM_MAIN_SRC_DIR}/utils/llvm-build/llvm-build")
+set(LLVMCONFIGLIBRARYDEPENDENCIESINC
+ "${LLVM_BINARY_DIR}/tools/llvm-config/LibraryDependencies.inc")
+set(LLVMBUILDCMAKEFRAG
+ "${LLVM_BINARY_DIR}/LLVMBuild.cmake")
+
+# Create the list of optional components that are enabled
+if (LLVM_USE_INTEL_JITEVENTS)
+ set(LLVMOPTIONALCOMPONENTS IntelJITEvents)
+endif (LLVM_USE_INTEL_JITEVENTS)
+if (LLVM_USE_OPROFILE)
+ set(LLVMOPTIONALCOMPONENTS ${LLVMOPTIONALCOMPONENTS} OProfileJIT)
+endif (LLVM_USE_OPROFILE)
+
+message(STATUS "Constructing LLVMBuild project information")
+execute_process(
+ COMMAND ${PYTHON_EXECUTABLE} ${LLVMBUILDTOOL}
+ --native-target "${LLVM_NATIVE_ARCH}"
+ --enable-targets "${LLVM_TARGETS_TO_BUILD}"
+ --enable-optional-components "${LLVMOPTIONALCOMPONENTS}"
+ --write-library-table ${LLVMCONFIGLIBRARYDEPENDENCIESINC}
+ --write-cmake-fragment ${LLVMBUILDCMAKEFRAG}
+ ERROR_VARIABLE LLVMBUILDOUTPUT
+ ERROR_VARIABLE LLVMBUILDERRORS
+ OUTPUT_STRIP_TRAILING_WHITESPACE
+ ERROR_STRIP_TRAILING_WHITESPACE
+ RESULT_VARIABLE LLVMBUILDRESULT)
+
+# On Win32, CMake doesn't properly handle piping the default output/error
+# streams into the GUI console. So, we explicitly catch and report them.
+if( NOT "${LLVMBUILDOUTPUT}" STREQUAL "")
+ message(STATUS "llvm-build output: ${LLVMBUILDOUTPUT}")
+endif()
+if( NOT "${LLVMBUILDRESULT}" STREQUAL "0" )
+ message(FATAL_ERROR
+ "Unexpected failure executing llvm-build: ${LLVMBUILDERRORS}")
+endif()
+
+# Include the generated CMake fragment. This will define properties from the
+# LLVMBuild files in a format which is easy to consume from CMake, and will add
+# the dependencies so that CMake will reconfigure properly when the LLVMBuild
+# files change.
+include(${LLVMBUILDCMAKEFRAG})
+
+######
+
+# Configure all of the various header file fragments LLVM uses which depend on
+# configuration variables.