llvm-mirror/CMakeLists.txt

# See docs/CMake.html for instructions about how to build LLVM with CMake.

project(LLVM)
cmake_minimum_required(VERSION 2.8)

# Add path for custom modules
set(CMAKE_MODULE_PATH
  ${CMAKE_MODULE_PATH}
  "${CMAKE_CURRENT_SOURCE_DIR}/cmake"
  "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules"
  )

set(LLVM_VERSION_MAJOR 3)
set(LLVM_VERSION_MINOR 4)

set(PACKAGE_VERSION "${LLVM_VERSION_MAJOR}.${LLVM_VERSION_MINOR}svn")

option(LLVM_INSTALL_TOOLCHAIN_ONLY "Only include toolchain files in the 'install' target." OFF)

option(LLVM_USE_FOLDERS "Enable solution folders in Visual Studio. Disable for Express versions." ON)
if ( LLVM_USE_FOLDERS )
  set_property(GLOBAL PROPERTY USE_FOLDERS ON)
endif()

if(MSVC AND NOT (${CMAKE_VERSION} VERSION_LESS 2.8.11))
  # set stack reserved size to ~10MB
  # CMake previously automatically set this value for MSVC builds, but the
  # behavior was changed in CMake 2.8.11 (Issue 12437) to use the MSVC default
  # value (1 MB) which is not enough for us in tasks such as parsing recursive
  # C++ templates in Clang.
  set(CMAKE_CXX_STACK_SIZE "10000000")
endif()

include(VersionFromVCS)

option(LLVM_APPEND_VC_REV
  "Append the version control system revision id to LLVM version" OFF)

if( LLVM_APPEND_VC_REV )
  add_version_info_from_vcs(PACKAGE_VERSION)
endif()

set(PACKAGE_NAME LLVM)
set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
set(PACKAGE_BUGREPORT "http://llvm.org/bugs/")

# Configure CPack.
set(CPACK_PACKAGE_VENDOR "LLVM")
set(CPACK_PACKAGE_VERSION_MAJOR ${LLVM_VERSION_MAJOR})
set(CPACK_PACKAGE_VERSION_MINOR ${LLVM_VERSION_MINOR})
if( LLVM_APPEND_VC_REV )
  add_version_info_from_vcs(CPACK_PACKAGE_VERSION_PATCH)
else()
  set(CPACK_PACKAGE_VERSION_PATCH "svn")
endif()
set(CPACK_RESOURCE_FILE_LICENSE "${CMAKE_CURRENT_SOURCE_DIR}/LICENSE.TXT")
if(WIN32 AND NOT UNIX)
  set(CPACK_PACKAGE_ICON "${CMAKE_CURRENT_SOURCE_DIR}\\\\cmake\\\\nsis_logo.bmp")
  set(CPACK_NSIS_MODIFY_PATH "ON")
  set(CPACK_NSIS_ENABLE_UNINSTALL_BEFORE_INSTALL "ON")
  set(CPACK_NSIS_EXTRA_INSTALL_COMMANDS
    "ExecWait '$INSTDIR/tools/msbuild/install.bat'")
  set(CPACK_NSIS_EXTRA_UNINSTALL_COMMANDS
    "ExecWait '$INSTDIR/tools/msbuild/uninstall.bat'")
endif()
include(CPack)

# Sanity check our source directory to make sure that we are not trying to
# generate an in-tree build (unless on MSVC_IDE, where it is ok), and to make
# sure that we don't have any stray generated files lying around in the tree
# (which would end up getting picked up by header search, instead of the correct
# versions).
if( CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR AND NOT MSVC_IDE )
  message(FATAL_ERROR "In-source builds are not allowed.
CMake would overwrite the makefiles distributed with LLVM.
Please create a directory and run cmake from there, passing the path
to this source directory as the last argument.
This process created the file `CMakeCache.txt' and the directory `CMakeFiles'.
Please delete them.")
endif()
if( NOT CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR )
  file(GLOB_RECURSE
    tablegenned_files_on_include_dir
    "${CMAKE_CURRENT_SOURCE_DIR}/include/llvm/*.gen")
  file(GLOB_RECURSE
    tablegenned_files_on_lib_dir
    "${CMAKE_CURRENT_SOURCE_DIR}/lib/Target/*.inc")
  if( tablegenned_files_on_include_dir OR tablegenned_files_on_lib_dir)
    message(FATAL_ERROR "Apparently there is a previous in-source build,
probably as the result of running `configure' and `make' on
${CMAKE_CURRENT_SOURCE_DIR}.
This may cause problems. The suspicious files are:
${tablegenned_files_on_lib_dir}
${tablegenned_files_on_include_dir}
Please clean the source directory.")
  endif()
endif()

string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE)

set(LLVM_MAIN_SRC_DIR ${CMAKE_CURRENT_SOURCE_DIR})
set(LLVM_MAIN_INCLUDE_DIR ${LLVM_MAIN_SRC_DIR}/include)
set(LLVM_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR})
set(LLVM_TOOLS_BINARY_DIR ${LLVM_BINARY_DIR}/bin)
set(LLVM_EXAMPLES_BINARY_DIR ${LLVM_BINARY_DIR}/examples)
set(LLVM_LIBDIR_SUFFIX "" CACHE STRING "Define suffix of library directory name (32/64)" )

set(LLVM_ALL_TARGETS
  AArch64
  ARM
  CppBackend
  Hexagon
  Mips
  MSP430
  NVPTX
  PowerPC
  R600
  Sparc
  SystemZ
  X86
  XCore
  )

# List of targets with JIT support:
set(LLVM_TARGETS_WITH_JIT X86 PowerPC AArch64 ARM Mips SystemZ)

set(LLVM_TARGETS_TO_BUILD "all"
    CACHE STRING "Semicolon-separated list of targets to build, or \"all\".")

set(LLVM_EXPERIMENTAL_TARGETS_TO_BUILD ""
  CACHE STRING "Semicolon-separated list of experimental targets to build.")

option(BUILD_SHARED_LIBS
  "Build all libraries as shared libraries instead of static" OFF)

option(LLVM_ENABLE_CBE_PRINTF_A "Set to ON if CBE is enabled for printf %a output" ON)
if(LLVM_ENABLE_CBE_PRINTF_A)
  set(ENABLE_CBE_PRINTF_A 1)
endif()

option(LLVM_ENABLE_TIMESTAMPS "Enable embedding timestamp information in build" ON)
if(LLVM_ENABLE_TIMESTAMPS)
  set(ENABLE_TIMESTAMPS 1)
endif()

option(LLVM_ENABLE_BACKTRACES "Enable embedding backtraces on crash." ON)
if(LLVM_ENABLE_BACKTRACES)
  set(ENABLE_BACKTRACES 1)
endif()

option(LLVM_ENABLE_CRASH_OVERRIDES "Enable crash overrides." ON)
if(LLVM_ENABLE_CRASH_OVERRIDES)
  set(ENABLE_CRASH_OVERRIDES 1)
endif()

option(LLVM_ENABLE_FFI "Use libffi to call external functions from the interpreter" OFF)
set(FFI_LIBRARY_DIR "" CACHE PATH "Additional directory, where CMake should search for libffi.so")
set(FFI_INCLUDE_DIR "" CACHE PATH "Additional directory, where CMake should search for ffi.h or ffi/ffi.h")

set(LLVM_TARGET_ARCH "host"
  CACHE STRING "Set target to use for LLVM JIT or use \"host\" for automatic detection.")

option(LLVM_ENABLE_TERMINFO "Use terminfo database if available." ON)

option(LLVM_ENABLE_THREADS "Use threads if available." ON)

option(LLVM_ENABLE_ZLIB "Use zlib for compression/decompression if available." ON)

if( LLVM_TARGETS_TO_BUILD STREQUAL "all" )
  set( LLVM_TARGETS_TO_BUILD ${LLVM_ALL_TARGETS} )
endif()

set(LLVM_TARGETS_TO_BUILD
   ${LLVM_TARGETS_TO_BUILD}
   ${LLVM_EXPERIMENTAL_TARGETS_TO_BUILD})
list(REMOVE_DUPLICATES LLVM_TARGETS_TO_BUILD)

set(llvm_builded_incs_dir ${LLVM_BINARY_DIR}/include/llvm)

include(AddLLVMDefinitions)

option(LLVM_ENABLE_PIC "Build Position-Independent Code" ON)

# MSVC has a gazillion warnings with this.
if( MSVC )
  option(LLVM_ENABLE_WARNINGS "Enable compiler warnings." OFF)
else( MSVC )
  option(LLVM_ENABLE_WARNINGS "Enable compiler warnings." ON)
endif()

option(LLVM_ENABLE_PEDANTIC "Compile with pedantic enabled." ON)
option(LLVM_ENABLE_WERROR "Fail and stop if a warning is triggered." OFF)

if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" )
  option(LLVM_ENABLE_ASSERTIONS "Enable assertions" OFF)
else()
  option(LLVM_ENABLE_ASSERTIONS "Enable assertions" ON)
endif()

option(LLVM_USE_INTEL_JITEVENTS
  "Use Intel JIT API to inform Intel(R) VTune(TM) Amplifier XE 2011 about JIT code"
  OFF)

if( LLVM_USE_INTEL_JITEVENTS )
  # Verify we are on a supported platform
  if( NOT CMAKE_SYSTEM_NAME MATCHES "Windows" AND NOT CMAKE_SYSTEM_NAME MATCHES "Linux" )
    message(FATAL_ERROR
      "Intel JIT API support is available on Linux and Windows only.")
  endif()
endif( LLVM_USE_INTEL_JITEVENTS )

option(LLVM_USE_OPROFILE
  "Use opagent JIT interface to inform OProfile about JIT code" OFF)

# If enabled, verify we are on a platform that supports oprofile.
if( LLVM_USE_OPROFILE )
  if( NOT CMAKE_SYSTEM_NAME MATCHES "Linux" )
    message(FATAL_ERROR "OProfile support is available on Linux only.") 
  endif( NOT CMAKE_SYSTEM_NAME MATCHES "Linux" )
endif( LLVM_USE_OPROFILE )

set(LLVM_USE_SANITIZER "" CACHE STRING
  "Define the sanitizer used to build binaries and tests.")

option(LLVM_USE_SPLIT_DWARF
  "Use -gsplit-dwarf when compiling llvm." OFF)

# Define an option controlling whether we should build for 32-bit on 64-bit
# platforms, where supported.
if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
  # TODO: support other platforms and toolchains.
  option(LLVM_BUILD_32_BITS "Build 32 bits executables and libraries." OFF)
endif()

# Define the default arguments to use with 'lit', and an option for the user to
# override.
set(LIT_ARGS_DEFAULT "-sv")
if (MSVC OR XCODE)
  set(LIT_ARGS_DEFAULT "${LIT_ARGS_DEFAULT} --no-progress-bar")
endif()
set(LLVM_LIT_ARGS "${LIT_ARGS_DEFAULT}" CACHE STRING "Default options for lit")

# On Win32 hosts, provide an option to specify the path to the GnuWin32 tools.
if( WIN32 AND NOT CYGWIN )
  set(LLVM_LIT_TOOLS_DIR "" CACHE PATH "Path to GnuWin32 tools")
endif()

# Define options to control the inclusion and default build behavior for
# components which may not strictly be necessary (tools, 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_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)

option (LLVM_BUILD_DOCS "Build the llvm documentation." OFF)
option (LLVM_INCLUDE_DOCS "Generate build targets for llvm documentation." ON)
option (LLVM_ENABLE_DOXYGEN "Use doxygen to generate llvm documentation." OFF)

# 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}
            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.
configure_file(
  ${LLVM_MAIN_INCLUDE_DIR}/llvm/Config/config.h.cmake
  ${LLVM_BINARY_DIR}/include/llvm/Config/config.h)
configure_file(
  ${LLVM_MAIN_INCLUDE_DIR}/llvm/Config/llvm-config.h.cmake
  ${LLVM_BINARY_DIR}/include/llvm/Config/llvm-config.h)
configure_file(
  ${LLVM_MAIN_INCLUDE_DIR}/llvm/Support/DataTypes.h.cmake
  ${LLVM_BINARY_DIR}/include/llvm/Support/DataTypes.h)

set( CMAKE_RUNTIME_OUTPUT_DIRECTORY ${LLVM_TOOLS_BINARY_DIR} )
set( CMAKE_LIBRARY_OUTPUT_DIRECTORY ${LLVM_BINARY_DIR}/lib )
set( CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${LLVM_BINARY_DIR}/lib )

set(CMAKE_INCLUDE_CURRENT_DIR ON)

include_directories( ${LLVM_BINARY_DIR}/include ${LLVM_MAIN_INCLUDE_DIR})

if( ${CMAKE_SYSTEM_NAME} MATCHES FreeBSD )
  # On FreeBSD, /usr/local/* is not used by default. In order to build LLVM
  # with libxml2, iconv.h, etc., we must add /usr/local paths.
  include_directories("/usr/local/include")
  link_directories("/usr/local/lib")
endif( ${CMAKE_SYSTEM_NAME} MATCHES FreeBSD )

if( ${CMAKE_SYSTEM_NAME} MATCHES SunOS )
   SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -include llvm/Support/Solaris.h")
endif( ${CMAKE_SYSTEM_NAME} MATCHES SunOS )

# Make sure we don't get -rdynamic in every binary. For those that need it,
# use set_target_properties(target PROPERTIES ENABLE_EXPORTS 1)
set(CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS "")

include(AddLLVM)
include(TableGen)

if( MINGW )
  # People report that -O3 is unreliable on MinGW. The traditional
  # build also uses -O2 for that reason:
  llvm_replace_compiler_option(CMAKE_CXX_FLAGS_RELEASE "-O3" "-O2")
endif()

# Put this before tblgen. Else we have a circular dependence.
add_subdirectory(lib/Support)
add_subdirectory(lib/TableGen)

add_subdirectory(utils/TableGen)

add_subdirectory(include/llvm)

add_subdirectory(lib)

add_subdirectory(utils/FileCheck)
add_subdirectory(utils/FileUpdate)
add_subdirectory(utils/count)
add_subdirectory(utils/not)
add_subdirectory(utils/llvm-lit)
add_subdirectory(utils/yaml-bench)

add_subdirectory(projects)

if( LLVM_INCLUDE_TOOLS )
  add_subdirectory(tools)
endif()

if( LLVM_INCLUDE_EXAMPLES )
  add_subdirectory(examples)
endif()

if( LLVM_INCLUDE_TESTS )
  add_subdirectory(test)
  add_subdirectory(utils/unittest)
  add_subdirectory(unittests)
  if (MSVC)
    # This utility is used to prevent crashing tests from calling Dr. Watson on
    # Windows.
    add_subdirectory(utils/KillTheDoctor)
  endif()

  # Add a global check rule now that all subdirectories have been traversed
  # and we know the total set of lit testsuites.
  get_property(LLVM_LIT_TESTSUITES GLOBAL PROPERTY LLVM_LIT_TESTSUITES)
  get_property(LLVM_LIT_PARAMS GLOBAL PROPERTY LLVM_LIT_PARAMS)
  get_property(LLVM_LIT_DEPENDS GLOBAL PROPERTY LLVM_LIT_DEPENDS)
  get_property(LLVM_LIT_EXTRA_ARGS GLOBAL PROPERTY LLVM_LIT_EXTRA_ARGS)
  add_lit_target(check-all
    "Running all regression tests"
    ${LLVM_LIT_TESTSUITES}
    PARAMS ${LLVM_LIT_PARAMS}
    DEPENDS ${LLVM_LIT_DEPENDS}
    ARGS ${LLVM_LIT_EXTRA_ARGS}
    )
endif()

if (LLVM_INCLUDE_DOCS)
  add_subdirectory(docs)
endif()

add_subdirectory(cmake/modules)

if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
  install(DIRECTORY include/
    DESTINATION include
    FILES_MATCHING
    PATTERN "*.def"
    PATTERN "*.h"
    PATTERN "*.td"
    PATTERN "*.inc"
    PATTERN "LICENSE.TXT"
    PATTERN ".svn" EXCLUDE
    )

  install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/
    DESTINATION include
    FILES_MATCHING
    PATTERN "*.def"
    PATTERN "*.h"
    PATTERN "*.gen"
    PATTERN "*.inc"
    # Exclude include/llvm/CMakeFiles/intrinsics_gen.dir, matched by "*.def"
    PATTERN "CMakeFiles" EXCLUDE
    PATTERN ".svn" EXCLUDE
    )
endif()

# Workaround for MSVS10 to avoid the Dialog Hell
# FIXME: This could be removed with future version of CMake.
if(MSVC_VERSION EQUAL 1600)
  set(LLVM_SLN_FILENAME "${CMAKE_CURRENT_BINARY_DIR}/LLVM.sln")
  if( EXISTS "${LLVM_SLN_FILENAME}" )
    file(APPEND "${LLVM_SLN_FILENAME}" "\n# This should be regenerated!\n")
  endif()
endif()