+# Verify that we can find a Python 2 interpreter. Python 3 is unsupported.
+set(Python_ADDITIONAL_VERSIONS 2.7 2.6 2.5)
+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 ${LLVMBUILDCMAKEFRAG}
+ OUTPUT_VARIABLE LLVMBUILDOUTPUT
+ ERROR_VARIABLE LLVMBUILDERRORS
+ OUTPUT_STRIP_TRAILING_WHITESPACE
+ ERROR_STRIP_TRAILING_WHITESPACE
+ RESULT_VARIABLE LLVMBUILDRESULT)
+
+# On Win32, CMake doesn't properly handle piping the default output/error
+# streams into the GUI console. So, we explicitly catch and report them.
+if( NOT "${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.
+set(LLVM_ENUM_TARGETS "")
+set(LLVM_ENUM_ASM_PRINTERS "")
+set(LLVM_ENUM_ASM_PARSERS "")
+set(LLVM_ENUM_DISASSEMBLERS "")
+foreach(t ${LLVM_TARGETS_TO_BUILD})
+ set( td ${LLVM_MAIN_SRC_DIR}/lib/Target/${t} )
+
+ list(FIND LLVM_ALL_TARGETS ${t} idx)
+ list(FIND LLVM_EXPERIMENTAL_TARGETS_TO_BUILD ${t} idy)
+ if( idx LESS 0 AND idy LESS 0 )
+ message(FATAL_ERROR "The target `${t}' does not exist.
+ It should be one of\n${LLVM_ALL_TARGETS}")
+ else()
+ set(LLVM_ENUM_TARGETS "${LLVM_ENUM_TARGETS}LLVM_TARGET(${t})\n")
+ endif()
+
+ file(GLOB asmp_file "${td}/*AsmPrinter.cpp")
+ if( asmp_file )
+ set(LLVM_ENUM_ASM_PRINTERS
+ "${LLVM_ENUM_ASM_PRINTERS}LLVM_ASM_PRINTER(${t})\n")
+ endif()
+ if( EXISTS ${td}/AsmParser/CMakeLists.txt )
+ set(LLVM_ENUM_ASM_PARSERS
+ "${LLVM_ENUM_ASM_PARSERS}LLVM_ASM_PARSER(${t})\n")
+ endif()
+ if( EXISTS ${td}/Disassembler/CMakeLists.txt )
+ set(LLVM_ENUM_DISASSEMBLERS
+ "${LLVM_ENUM_DISASSEMBLERS}LLVM_DISASSEMBLER(${t})\n")
+ endif()
+endforeach(t)
+
+# Produce the target definition files, which provide a way for clients to easily
+# include various classes of targets.
+configure_file(
+ ${LLVM_MAIN_INCLUDE_DIR}/llvm/Config/AsmPrinters.def.in
+ ${LLVM_BINARY_DIR}/include/llvm/Config/AsmPrinters.def
+ )
+configure_file(
+ ${LLVM_MAIN_INCLUDE_DIR}/llvm/Config/AsmParsers.def.in
+ ${LLVM_BINARY_DIR}/include/llvm/Config/AsmParsers.def
+ )
+configure_file(
+ ${LLVM_MAIN_INCLUDE_DIR}/llvm/Config/Disassemblers.def.in
+ ${LLVM_BINARY_DIR}/include/llvm/Config/Disassemblers.def
+ )
+configure_file(
+ ${LLVM_MAIN_INCLUDE_DIR}/llvm/Config/Targets.def.in
+ ${LLVM_BINARY_DIR}/include/llvm/Config/Targets.def
+ )
+
+# Configure the three LLVM configuration header files.