CMakeLists.txt

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

cmake_minimum_required(VERSION 3.4.3)

cmake_policy(SET CMP0022 NEW)

cmake_policy(SET CMP0048 NEW)

# CMake 3.1 and higher include generator expressions of the form
# $<TARGETLIB:obj> in the SOURCES property.  These need to be
# stripped everywhere that access the SOURCES property, so we just
# defer to the OLD behavior of not including generator expressions
# in the output for now.
cmake_policy(SET CMP0051 OLD)

cmake_policy(SET CMP0056 NEW)

cmake_policy(SET CMP0057 NEW)

if(POLICY CMP0068)
  cmake_policy(SET CMP0068 NEW)
  set(CMAKE_BUILD_WITH_INSTALL_NAME_DIR ON)
endif()

if(NOT DEFINED LLVM_VERSION_MAJOR)
  set(LLVM_VERSION_MAJOR 7)
endif()
if(NOT DEFINED LLVM_VERSION_MINOR)
  set(LLVM_VERSION_MINOR 0)
endif()
if(NOT DEFINED LLVM_VERSION_PATCH)
  set(LLVM_VERSION_PATCH 0)
endif()
if(NOT DEFINED LLVM_VERSION_SUFFIX)
  set(LLVM_VERSION_SUFFIX svn)
endif()

if (NOT PACKAGE_VERSION)
  set(PACKAGE_VERSION
    "${LLVM_VERSION_MAJOR}.${LLVM_VERSION_MINOR}.${LLVM_VERSION_PATCH}${LLVM_VERSION_SUFFIX}")
endif()

if ((CMAKE_GENERATOR MATCHES "Visual Studio") AND (CMAKE_GENERATOR_TOOLSET STREQUAL ""))
  message(WARNING "Visual Studio generators use the x86 host compiler by "
                  "default, even for 64-bit targets. This can result in linker "
                  "instability and out of memory errors. To use the 64-bit "
                  "host compiler, pass -Thost=x64 on the CMake command line.")
endif()

project(LLVM
  VERSION ${LLVM_VERSION_MAJOR}.${LLVM_VERSION_MINOR}.${LLVM_VERSION_PATCH}
  LANGUAGES C CXX ASM)

if (NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
  message(STATUS "No build type selected, default to Debug")
  set(CMAKE_BUILD_TYPE "Debug" CACHE STRING "Build type (default Debug)" FORCE)
endif()

# This should only apply if you are both on an Apple host, and targeting Apple.
if(CMAKE_HOST_APPLE AND APPLE)
  # if CMAKE_LIBTOOL is not set, try and find it with xcrun or find_program
  if(NOT CMAKE_LIBTOOL)
    if(NOT CMAKE_XCRUN)
      find_program(CMAKE_XCRUN NAMES xcrun)
    endif()
    if(CMAKE_XCRUN)
      execute_process(COMMAND ${CMAKE_XCRUN} -find libtool
        OUTPUT_VARIABLE CMAKE_LIBTOOL
        OUTPUT_STRIP_TRAILING_WHITESPACE)
    endif()

    if(NOT CMAKE_LIBTOOL OR NOT EXISTS CMAKE_LIBTOOL)
      find_program(CMAKE_LIBTOOL NAMES libtool)
    endif()
  endif()

  get_property(languages GLOBAL PROPERTY ENABLED_LANGUAGES)
  if(CMAKE_LIBTOOL)
    set(CMAKE_LIBTOOL ${CMAKE_LIBTOOL} CACHE PATH "libtool executable")
    message(STATUS "Found libtool - ${CMAKE_LIBTOOL}")

    execute_process(COMMAND ${CMAKE_LIBTOOL} -V
      OUTPUT_VARIABLE LIBTOOL_V_OUTPUT
      OUTPUT_STRIP_TRAILING_WHITESPACE)
    if("${LIBTOOL_V_OUTPUT}" MATCHES ".*cctools-([0-9.]+).*")
      string(REGEX REPLACE ".*cctools-([0-9.]+).*" "\\1" LIBTOOL_VERSION
        ${LIBTOOL_V_OUTPUT})
      if(NOT LIBTOOL_VERSION VERSION_LESS "862")
        set(LIBTOOL_NO_WARNING_FLAG "-no_warning_for_no_symbols")
      endif()
    endif()

    foreach(lang ${languages})
      set(CMAKE_${lang}_CREATE_STATIC_LIBRARY
        "${CMAKE_LIBTOOL} -static ${LIBTOOL_NO_WARNING_FLAG} -o <TARGET> \
        <LINK_FLAGS> <OBJECTS> ")
    endforeach()
  endif()

  # If DYLD_LIBRARY_PATH is set we need to set it on archiver commands
  if(DYLD_LIBRARY_PATH)
    set(dyld_envar "DYLD_LIBRARY_PATH=${DYLD_LIBRARY_PATH}")
    foreach(lang ${languages})
      foreach(cmd ${CMAKE_${lang}_CREATE_STATIC_LIBRARY})
        list(APPEND CMAKE_${lang}_CREATE_STATIC_LIBRARY_NEW
             "${dyld_envar} ${cmd}")
      endforeach()
      set(CMAKE_${lang}_CREATE_STATIC_LIBRARY
        ${CMAKE_${lang}_CREATE_STATIC_LIBRARY_NEW})
    endforeach()
  endif()
endif()

# Side-by-side subprojects layout: automatically set the
# LLVM_EXTERNAL_${project}_SOURCE_DIR using LLVM_ALL_PROJECTS
# This allows an easy way of setting up a build directory for llvm and another
# one for llvm+clang+... using the same sources.
set(LLVM_ALL_PROJECTS "clang;libcxx;libcxxabi;lldb;compiler-rt;lld;polly;debuginfo-tests")
set(LLVM_ENABLE_PROJECTS "" CACHE STRING
	"Semicolon-separated list of projects to build (${LLVM_ALL_PROJECTS}), or \"all\".")
if( LLVM_ENABLE_PROJECTS STREQUAL "all" )
  set( LLVM_ENABLE_PROJECTS ${LLVM_ALL_PROJECTS})
endif()
foreach(proj ${LLVM_ENABLE_PROJECTS})
  set(PROJ_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../${proj}")
  if(NOT EXISTS "${PROJ_DIR}" OR NOT IS_DIRECTORY "${PROJ_DIR}")
    message(FATAL_ERROR "LLVM_ENABLE_PROJECTS requests ${proj} but directory not found: ${PROJ_DIR}")
  endif()
  string(TOUPPER "${proj}" upper_proj)
  STRING(REGEX REPLACE "-" "_" upper_proj ${upper_proj})
  set(LLVM_EXTERNAL_${upper_proj}_SOURCE_DIR   "${CMAKE_CURRENT_SOURCE_DIR}/../${proj}")
  # There is a widely spread opinion that clang-tools-extra should be merged
  # into clang. The following simulates it by always enabling clang-tools-extra
  # when enabling clang.
  if (proj STREQUAL "clang")
    set(LLVM_EXTERNAL_CLANG_TOOLS_EXTRA_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../clang-tools-extra")
  endif()
endforeach()

# Build llvm with ccache if the package is present
set(LLVM_CCACHE_BUILD OFF CACHE BOOL "Set to ON for a ccache enabled build")
if(LLVM_CCACHE_BUILD)
  find_program(CCACHE_PROGRAM ccache)
  if(CCACHE_PROGRAM)
      set(LLVM_CCACHE_MAXSIZE "" CACHE STRING "Size of ccache")
      set(LLVM_CCACHE_DIR "" CACHE STRING "Directory to keep ccached data")
      set(LLVM_CCACHE_PARAMS "CCACHE_CPP2=yes CCACHE_HASHDIR=yes"
          CACHE STRING "Parameters to pass through to ccache")

      set(CCACHE_PROGRAM "${LLVM_CCACHE_PARAMS} ${CCACHE_PROGRAM}")
      if (LLVM_CCACHE_MAXSIZE)
        set(CCACHE_PROGRAM "CCACHE_MAXSIZE=${LLVM_CCACHE_MAXSIZE} ${CCACHE_PROGRAM}")
      endif()
      if (LLVM_CCACHE_DIR)
        set(CCACHE_PROGRAM "CCACHE_DIR=${LLVM_CCACHE_DIR} ${CCACHE_PROGRAM}")
      endif()
      set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ${CCACHE_PROGRAM})
  else()
    message(FATAL_ERROR "Unable to find the program ccache. Set LLVM_CCACHE_BUILD to OFF")
  endif()
endif()

option(LLVM_DEPENDENCY_DEBUGGING "Dependency debugging mode to verify correctly expressed library dependencies (Darwin only)" OFF)

# Some features of the LLVM build may be disallowed when dependency debugging is
# enabled. In particular you cannot use ccache because we want to force compile
# operations to always happen.
if(LLVM_DEPENDENCY_DEBUGGING)
  if(NOT CMAKE_HOST_APPLE)
    message(FATAL_ERROR "Dependency debugging is only currently supported on Darwin hosts.")
  endif()
  if(LLVM_CCACHE_BUILD)
    message(FATAL_ERROR "Cannot enable dependency debugging while using ccache.")
  endif()
endif()

option(LLVM_ENABLE_DAGISEL_COV "Debug: Prints tablegen patterns that were used for selecting" OFF)
option(LLVM_ENABLE_GISEL_COV "Enable collection of GlobalISel rule coverage" OFF)
if(LLVM_ENABLE_GISEL_COV)
  set(LLVM_GISEL_COV_PREFIX "${CMAKE_BINARY_DIR}/gisel-coverage-" CACHE STRING "Provide a filename prefix to collect the GlobalISel rule coverage")
endif()

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

# Generate a CompilationDatabase (compile_commands.json file) for our build,
# for use by clang_complete, YouCompleteMe, etc.
set(CMAKE_EXPORT_COMPILE_COMMANDS 1)

option(LLVM_INSTALL_BINUTILS_SYMLINKS
  "Install symlinks from the binutils tool names to the corresponding LLVM tools." OFF)

option(LLVM_INSTALL_CCTOOLS_SYMLINKS
  "Install symlinks from the cctools tool names to the corresponding LLVM tools." OFF)

option(LLVM_INSTALL_UTILS "Include utility binaries in the 'install' target." OFF)