#------------------------------------------------------------------------------
# CLING - the C++ LLVM-based InterpreterG :)
#
# This file is dual-licensed: you can choose to license it under the University
# of Illinois Open Source License or the GNU Lesser General Public License. See
# LICENSE.TXT for details.
#------------------------------------------------------------------------------

# If we are not building as a part of LLVM, build Cling as an
# standalone project, using LLVM as an external library:
if( CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR )
  project(Cling)
  cmake_minimum_required(VERSION 2.8)

  set(CLING_PATH_TO_LLVM_SOURCE "" CACHE PATH
    "Path to LLVM source code. Not necessary if using an installed LLVM.")
  set(CLING_PATH_TO_LLVM_BUILD "" CACHE PATH
    "Path to the directory where LLVM was built or installed.")

  if( CLING_PATH_TO_LLVM_SOURCE )
    if( NOT EXISTS "${CLING_PATH_TO_LLVM_SOURCE}/cmake/config-ix.cmake" )
      message(FATAL_ERROR "Please set CLING_PATH_TO_LLVM_SOURCE to the root directory of LLVM source code.")
    else()
      get_filename_component(LLVM_MAIN_SRC_DIR ${CLING_PATH_TO_LLVM_SOURCE}
    ABSOLUTE)
      list(APPEND CMAKE_MODULE_PATH "${LLVM_MAIN_SRC_DIR}/cmake/modules")
    endif()
  endif()

  if( NOT EXISTS "${CLING_PATH_TO_LLVM_BUILD}/bin/llvm-tblgen${CMAKE_EXECUTABLE_SUFFIX}" )
    message(FATAL_ERROR "Please set CLING_PATH_TO_LLVM_BUILD to a directory containing a LLVM build.")
  endif()

  list(APPEND CMAKE_MODULE_PATH "${CLING_PATH_TO_LLVM_BUILD}/share/llvm/cmake")

  # They are used as destination of target generators.
  set(LLVM_RUNTIME_OUTPUT_INTDIR ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin)
  set(LLVM_LIBRARY_OUTPUT_INTDIR ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib)

  get_filename_component(PATH_TO_LLVM_BUILD ${CLING_PATH_TO_LLVM_BUILD}
    ABSOLUTE)

  include(AddLLVM)
  include("${CLING_PATH_TO_LLVM_BUILD}/share/llvm/cmake/LLVMConfig.cmake")
  include(HandleLLVMOptions)

  set(PACKAGE_VERSION "${LLVM_PACKAGE_VERSION}")

  set(LLVM_MAIN_INCLUDE_DIR "${LLVM_MAIN_SRC_DIR}/include")
  set(LLVM_BINARY_DIR ${CMAKE_BINARY_DIR})

  set(CMAKE_INCLUDE_CURRENT_DIR ON)
  include_directories("${PATH_TO_LLVM_BUILD}/include" "${LLVM_MAIN_INCLUDE_DIR}")
  link_directories("${PATH_TO_LLVM_BUILD}/lib")

  set(LLVM_TABLEGEN_EXE "${PATH_TO_LLVM_BUILD}/bin/llvm-tblgen")

  set( CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin )
  set( CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib )
  set( CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib )

  set( CLING_BUILT_STANDALONE 1 )
endif()

set(C_INCLUDE_DIRS "" CACHE STRING
  "Colon separated list of directories cling will search for headers.")

set(CLING_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
set(CLING_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR})

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()

# Add appropriate flags for GCC
if (LLVM_COMPILER_IS_GCC_COMPATIBLE)
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-common -Woverloaded-virtual -Wcast-qual -fno-strict-aliasing -pedantic -Wno-long-long -Wall -W -Wno-unused-parameter -Wwrite-strings")
endif ()

# The package needs to be compiler without RTTI information
if(MSVC)
  add_definitions(/GR-)
else()
  add_definitions(-fno-rtti)
endif()

if (APPLE)
  set(CMAKE_MODULE_LINKER_FLAGS "-Wl,-flat_namespace -Wl,-undefined -Wl,suppress")
endif ()

include(LLVMParseArguments)

macro(add_cling_library name)
  cmake_parse_arguments(ARG
    ""
    ""
    "ADDITIONAL_HEADERS"
    ${ARGN})
  set(srcs)
  if(MSVC_IDE OR XCODE)
    # Add public headers
    file(RELATIVE_PATH lib_path
      ${CLING_SOURCE_DIR}/lib/
      ${CMAKE_CURRENT_SOURCE_DIR}
    )
    if(NOT lib_path MATCHES "^[.][.]")
      file( GLOB_RECURSE headers
        ${CLING_SOURCE_DIR}/include/cling/${lib_path}/*.h
        ${CLING_SOURCE_DIR}/include/cling/${lib_path}/*.def
      )
      set_source_files_properties(${headers} PROPERTIES HEADER_FILE_ONLY ON)

      file( GLOB_RECURSE tds
        ${CLING_SOURCE_DIR}/include/cling/${lib_path}/*.td
      )
      source_group("TableGen descriptions" FILES ${tds})
      set_source_files_properties(${tds}} PROPERTIES HEADER_FILE_ONLY ON)

      if(headers OR tds)
         set(srcs ${headers} ${tds})
      endif()
    endif()
  endif(MSVC_IDE OR XCODE)
  if(srcs OR ARG_ADDITIONAL_HEADERS)
    set(srcs
      ADDITIONAL_HEADERS
      ${srcs}
      ${ARG_ADDITIONAL_HEADERS} # It may contain unparsed unknown args.
      )
  endif()
  llvm_add_library(${name} ${ARG_UNPARSED_ARGUMENTS} ${srcs})

  if(TARGET ${name})
    target_link_libraries(${name} ${cmake_2_8_12_INTERFACE} ${LLVM_COMMON_LIBS})

    if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY OR ${name} STREQUAL "libcling")
      install(TARGETS ${name}
        LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
        ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX}
        RUNTIME DESTINATION bin)
    endif()
  else()
    # Add empty "phony" target
    add_custom_target(${name})
  endif()

  set_target_properties(${name} PROPERTIES FOLDER "Cling libraries")
endmacro(add_cling_library)

macro(add_cling_executable name)
  add_llvm_executable( ${name} ${ARGN} )
  set_target_properties(${name} PROPERTIES FOLDER "Cling executables")
endmacro(add_cling_executable)

get_filename_component(_realpath ${CMAKE_CURRENT_SOURCE_DIR}/../clang/include REALPATH)
include_directories(BEFORE
  ${CMAKE_CURRENT_BINARY_DIR}/../clang/include
  # ${CMAKE_CURRENT_SOURCE_DIR}/../clang/include
  ${_realpath}
  )

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

install(DIRECTORY include/
  DESTINATION include
  FILES_MATCHING
  PATTERN "*.def"
  PATTERN "*.h"
  PATTERN ".svn" EXCLUDE
  )

install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/
  DESTINATION include
  FILES_MATCHING
  PATTERN "CMakeFiles" EXCLUDE
  PATTERN "*.inc"
  )

add_definitions( -D_GNU_SOURCE
  -DCLING_INCLUDE_PATHS="${CLING_SOURCE_DIR}/include:${CLING_BINARY_DIR}/include" )

# Determine cling's version:
file (STRINGS "VERSION" CLING_VERSION)

add_subdirectory(lib)
add_subdirectory(tools)

# TODO: docs.
#add_subdirectory(test)
option(CLING_INCLUDE_TESTS
       "Generate build targets for the Cling unit tests."
       ${LLVM_INCLUDE_TESTS})

if( CLING_INCLUDE_TESTS )
  add_subdirectory(test)
endif()

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