# If we are not building as a part of LLVM, build lld as a standalone project,
# using LLVM as an external library.

cmake_minimum_required(VERSION 2.8)

# FIXME: It may be removed when we use 2.8.12.
if(CMAKE_VERSION VERSION_LESS 2.8.12)
  # Invalidate a couple of keywords.
  set(cmake_2_8_12_INTERFACE)
  set(cmake_2_8_12_PRIVATE)
else()
  # Use ${cmake_2_8_12_KEYWORD} intead of KEYWORD in target_link_libraries().
  set(cmake_2_8_12_INTERFACE INTERFACE)
  set(cmake_2_8_12_PRIVATE PRIVATE)
  if(POLICY CMP0022)
    cmake_policy(SET CMP0022 NEW) # automatic when 2.8.12 is required
  endif()
endif()


set(LLD_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
set(LLD_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR})

# Compute the LLD version from the LLVM version.
string(REGEX MATCH "[0-9]+\\.[0-9]+(\\.[0-9]+)?" LLD_VERSION
  ${PACKAGE_VERSION})
message(STATUS "LLD version: ${LLD_VERSION}")

string(REGEX REPLACE "([0-9]+)\\.[0-9]+(\\.[0-9]+)?" "\\1" LLD_VERSION_MAJOR
  ${LLD_VERSION})
string(REGEX REPLACE "[0-9]+\\.([0-9]+)(\\.[0-9]+)?" "\\1" LLD_VERSION_MINOR
  ${LLD_VERSION})

# Determine LLD revision and repository.
# TODO: Figure out a way to get the revision and the repository on windows.
if ( NOT CMAKE_SYSTEM_NAME MATCHES "Windows" )
  execute_process(COMMAND ${CMAKE_SOURCE_DIR}/utils/GetSourceVersion ${LLD_SOURCE_DIR}
                  OUTPUT_VARIABLE LLD_REVISION)

  execute_process(COMMAND ${CMAKE_SOURCE_DIR}/utils/GetRepositoryPath ${LLD_SOURCE_DIR}
                  OUTPUT_VARIABLE LLD_REPOSITORY)
  if ( LLD_REPOSITORY )
    # Replace newline characters with spaces
    string(REGEX REPLACE "(\r?\n)+" " " LLD_REPOSITORY ${LLD_REPOSITORY})
    # Remove leading spaces
    STRING(REGEX REPLACE "^[ \t\r\n]+" "" LLD_REPOSITORY "${LLD_REPOSITORY}" )
    # Remove trailing spaces
    string(REGEX REPLACE "(\ )+$" "" LLD_REPOSITORY ${LLD_REPOSITORY})
  endif()

  if ( LLD_REVISION )
    # Replace newline characters with spaces
    string(REGEX REPLACE "(\r?\n)+" " " LLD_REVISION ${LLD_REVISION})
    # Remove leading spaces
    STRING(REGEX REPLACE "^[ \t\r\n]+" "" LLD_REVISION "${LLD_REVISION}" )
    # Remove trailing spaces
    string(REGEX REPLACE "(\ )+$" "" LLD_REVISION ${LLD_REVISION})
  endif()
endif ()

# Configure the Version.inc file.
configure_file(
  ${CMAKE_CURRENT_SOURCE_DIR}/include/lld/Config/Version.inc.in
  ${CMAKE_CURRENT_BINARY_DIR}/include/lld/Config/Version.inc)


if (CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR)
  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()

list (APPEND CMAKE_MODULE_PATH "${LLD_SOURCE_DIR}/cmake/modules")

option(LLD_USE_VTUNE
       "Enable VTune user task tracking."
       OFF)
if (LLD_USE_VTUNE)
  find_package(VTune)
  if (VTUNE_FOUND)
    include_directories(${VTune_INCLUDE_DIRS})
    list(APPEND LLVM_COMMON_LIBS ${VTune_LIBRARIES})
    add_definitions(-DLLD_HAS_VTUNE)
  endif()
endif()

# lld requires c++11 to build. Make sure that we have a compiler and standard
# library combination that can do that.
if (NOT MSVC)
  # gcc and clang require the -std=c++0x or -std=c++11 flag.
  if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU|Clang" AND
      NOT ("${CMAKE_CXX_FLAGS}" MATCHES ".*-std=(c|gnu)\\+\\+(0x|11|1y).*"))
    message(FATAL_ERROR
      "lld requires c++11. Clang and gcc require -std=c++0x or -std=c++11 to "
      "enter this mode. Please set CMAKE_CXX_FLAGS accordingly.")
  endif()
elseif (MSVC_VERSION LESS 1700)
  message(FATAL_ERROR "The selected compiler does not support c++11 which is "
          "required to build lld.")
endif()

if (MSVC)
  add_definitions(-wd4530) # Suppress 'warning C4530: C++ exception handler used, but unwind semantics are not enabled.'
endif()

macro(add_lld_library name)
  llvm_process_sources(srcs ${ARGN})
  if (MSVC_IDE OR XCODE)
    string(REGEX MATCHALL "/[^/]+" split_path ${CMAKE_CURRENT_SOURCE_DIR})
    list(GET split_path -1 dir)
    file(GLOB_RECURSE headers
      ../../include/lld${dir}/*.h)
    set(srcs ${srcs} ${headers})
  endif()
  if (MODULE)
    set(libkind MODULE)
  elseif (SHARED_LIBRARY)
    set(libkind SHARED)
  else()
    set(libkind)
  endif()
  add_library(${name} ${libkind} ${srcs})
  llvm_update_compile_flags(${name} ${srcs})
  if (LLVM_COMMON_DEPENDS)
    add_dependencies(${name} ${LLVM_COMMON_DEPENDS})
  endif()

  target_link_libraries(${name} ${LLVM_USED_LIBS})
  llvm_config(${name} ${LLVM_LINK_COMPONENTS})
  target_link_libraries(${name} ${LLVM_COMMON_LIBS})

  if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
    install(TARGETS ${name}
      LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
      ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX})
  endif()
  set_target_properties(${name} PROPERTIES FOLDER "lld libraries")
endmacro(add_lld_library)

macro(add_lld_executable name)
  add_llvm_executable(${name} ${ARGN})
  set_target_properties(${name} PROPERTIES FOLDER "lld executables")
endmacro(add_lld_executable)

include_directories(BEFORE
  ${CMAKE_CURRENT_BINARY_DIR}/include
  ${CMAKE_CURRENT_SOURCE_DIR}/include
  )

if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
  install(DIRECTORY include/
    DESTINATION include
    FILES_MATCHING
    PATTERN "*.h"
    PATTERN ".svn" EXCLUDE
    )
endif()

add_subdirectory(lib)
add_subdirectory(tools)
add_subdirectory(utils)

add_subdirectory(test)

if (LLVM_INCLUDE_TESTS)
  add_subdirectory(unittests)
endif()

add_subdirectory(docs)