function(clr_unknown_arch)
    if (WIN32)
        message(FATAL_ERROR "Only AMD64, ARM64, ARM and I386 are supported")
    elseif(CLR_CROSS_COMPONENTS_BUILD)
        message(FATAL_ERROR "Only AMD64, I386 host are supported for linux cross-architecture component")
    else()
        message(FATAL_ERROR "Only AMD64, ARM64 and ARM are supported")
    endif()
endfunction()

# Build a list of compiler definitions by putting -D in front of each define.
function(get_compile_definitions DefinitionName)
    # Get the current list of definitions
    get_directory_property(COMPILE_DEFINITIONS_LIST COMPILE_DEFINITIONS)

    foreach(DEFINITION IN LISTS COMPILE_DEFINITIONS_LIST)
        if (${DEFINITION} MATCHES "^\\$<\\$<CONFIG:([^>]+)>:([^>]+)>$")
            # The entries that contain generator expressions must have the -D inside of the
            # expression. So we transform e.g. $<$<CONFIG:Debug>:_DEBUG> to $<$<CONFIG:Debug>:-D_DEBUG>
            set(DEFINITION "$<$<CONFIG:${CMAKE_MATCH_1}>:-D${CMAKE_MATCH_2}>")
        else()
            set(DEFINITION -D${DEFINITION})
        endif()
        list(APPEND DEFINITIONS ${DEFINITION})
    endforeach()
    set(${DefinitionName} ${DEFINITIONS} PARENT_SCOPE)
endfunction(get_compile_definitions)

# Build a list of include directories
function(get_include_directories IncludeDirectories)
    get_directory_property(dirs INCLUDE_DIRECTORIES)
    foreach(dir IN LISTS dirs)

      if (CLR_CMAKE_PLATFORM_ARCH_ARM AND WIN32)
        list(APPEND INC_DIRECTORIES /I${dir})
      else()
        list(APPEND INC_DIRECTORIES -I${dir})
      endif(CLR_CMAKE_PLATFORM_ARCH_ARM AND WIN32)

    endforeach()
    set(${IncludeDirectories} ${INC_DIRECTORIES} PARENT_SCOPE)
endfunction(get_include_directories)

# Build a list of include directories for consumption by the assembler
function(get_include_directories_asm IncludeDirectories)
    get_directory_property(dirs INCLUDE_DIRECTORIES)

    if (CLR_CMAKE_PLATFORM_ARCH_ARM AND WIN32)
        list(APPEND INC_DIRECTORIES "-I ")
    endif()

    foreach(dir IN LISTS dirs)
      if (CLR_CMAKE_PLATFORM_ARCH_ARM AND WIN32)
        list(APPEND INC_DIRECTORIES ${dir};)
      else()
        list(APPEND INC_DIRECTORIES -I${dir})
      endif()
    endforeach()

    set(${IncludeDirectories} ${INC_DIRECTORIES} PARENT_SCOPE)
endfunction(get_include_directories_asm)

# Set the passed in RetSources variable to the list of sources with added current source directory
# to form absolute paths.
# The parameters after the RetSources are the input files.
function(convert_to_absolute_path RetSources)
    set(Sources ${ARGN})
    foreach(Source IN LISTS Sources)
        list(APPEND AbsolutePathSources ${CMAKE_CURRENT_SOURCE_DIR}/${Source})
    endforeach()
    set(${RetSources} ${AbsolutePathSources} PARENT_SCOPE)
endfunction(convert_to_absolute_path)

#Preprocess exports definition file
function(preprocess_def_file inputFilename outputFilename)
  get_compile_definitions(PREPROCESS_DEFINITIONS)
  get_include_directories(ASM_INCLUDE_DIRECTORIES)
  add_custom_command(
    OUTPUT ${outputFilename}
    COMMAND ${CMAKE_CXX_COMPILER} ${ASM_INCLUDE_DIRECTORIES} /P /EP /TC ${PREPROCESS_DEFINITIONS}  /Fi${outputFilename}  ${inputFilename}
    DEPENDS ${inputFilename}
    COMMENT "Preprocessing ${inputFilename} - ${CMAKE_CXX_COMPILER} ${ASM_INCLUDE_DIRECTORIES} /P /EP /TC ${PREPROCESS_DEFINITIONS}  /Fi${outputFilename}  ${inputFilename}"
  )

  set_source_files_properties(${outputFilename}
                              PROPERTIES GENERATED TRUE)
endfunction()

function(generate_exports_file inputFilename outputFilename)
  if(CMAKE_SYSTEM_NAME STREQUAL Darwin)
    set(AWK_SCRIPT generateexportedsymbols.awk)
  else()
    set(AWK_SCRIPT generateversionscript.awk)
  endif(CMAKE_SYSTEM_NAME STREQUAL Darwin)

  add_custom_command(
    OUTPUT ${outputFilename}
    COMMAND ${AWK} -f ${CMAKE_SOURCE_DIR}/${AWK_SCRIPT} ${inputFilename} >${outputFilename}
    DEPENDS ${inputFilename} ${CMAKE_SOURCE_DIR}/${AWK_SCRIPT}
    COMMENT "Generating exports file ${outputFilename}"
  )
  set_source_files_properties(${outputFilename}
                              PROPERTIES GENERATED TRUE)
endfunction()

function(generate_exports_file_prefix inputFilename outputFilename prefix)

  if(CMAKE_SYSTEM_NAME STREQUAL Darwin)
    set(AWK_SCRIPT generateexportedsymbols.awk)
  else()
    set(AWK_SCRIPT generateversionscript.awk)
    if (NOT ${prefix} STREQUAL "")
        set(AWK_VARS ${AWK_VARS} -v prefix=${prefix})
    endif()
  endif(CMAKE_SYSTEM_NAME STREQUAL Darwin)

  add_custom_command(
    OUTPUT ${outputFilename}
    COMMAND ${AWK} -f ${CMAKE_SOURCE_DIR}/${AWK_SCRIPT} ${AWK_VARS} ${inputFilename} >${outputFilename}
    DEPENDS ${inputFilename} ${CMAKE_SOURCE_DIR}/${AWK_SCRIPT}
    COMMENT "Generating exports file ${outputFilename}"
  )
  set_source_files_properties(${outputFilename}
                              PROPERTIES GENERATED TRUE)
endfunction()

function(add_precompiled_header header cppFile targetSources)
  if(MSVC)
    set(precompiledBinary "${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/stdafx.pch")

    set_source_files_properties(${cppFile}
                                PROPERTIES COMPILE_FLAGS "/Yc\"${header}\" /Fp\"${precompiledBinary}\""
                                           OBJECT_OUTPUTS "${precompiledBinary}")
    set_source_files_properties(${${targetSources}}
                                PROPERTIES COMPILE_FLAGS "/Yu\"${header}\" /Fp\"${precompiledBinary}\""
                                           OBJECT_DEPENDS "${precompiledBinary}")
    # Add cppFile to SourcesVar
    set(${targetSources} ${${targetSources}} ${cppFile} PARENT_SCOPE)
  endif(MSVC)
endfunction()

function(strip_symbols targetName outputFilename)
  if (CLR_CMAKE_PLATFORM_UNIX)
    if (STRIP_SYMBOLS)

      # On the older version of cmake (2.8.12) used on Ubuntu 14.04 the TARGET_FILE
      # generator expression doesn't work correctly returning the wrong path and on
      # the newer cmake versions the LOCATION property isn't supported anymore.
      if (CMAKE_VERSION VERSION_EQUAL 3.0 OR CMAKE_VERSION VERSION_GREATER 3.0)
          set(strip_source_file $<TARGET_FILE:${targetName}>)
      else()
          get_property(strip_source_file TARGET ${targetName} PROPERTY LOCATION)
      endif()

      if (CMAKE_SYSTEM_NAME STREQUAL Darwin)
        set(strip_destination_file ${strip_source_file}.dwarf)

        add_custom_command(
          TARGET ${targetName}
          POST_BUILD
          VERBATIM
          COMMAND ${DSYMUTIL} --flat --minimize ${strip_source_file}
          COMMAND ${STRIP} -S ${strip_source_file}
          COMMENT Stripping symbols from ${strip_source_file} into file ${strip_destination_file}
        )
      else (CMAKE_SYSTEM_NAME STREQUAL Darwin)
        set(strip_destination_file ${strip_source_file}.dbg)

        add_custom_command(
          TARGET ${targetName}
          POST_BUILD
          VERBATIM
          COMMAND ${OBJCOPY} --only-keep-debug ${strip_source_file} ${strip_destination_file}
          COMMAND ${OBJCOPY} --strip-debug ${strip_source_file}
          COMMAND ${OBJCOPY} --add-gnu-debuglink=${strip_destination_file} ${strip_source_file}
          COMMENT Stripping symbols from ${strip_source_file} into file ${strip_destination_file}
        )
      endif (CMAKE_SYSTEM_NAME STREQUAL Darwin)

      set(${outputFilename} ${strip_destination_file} PARENT_SCOPE)
    endif (STRIP_SYMBOLS)
  endif(CLR_CMAKE_PLATFORM_UNIX)
endfunction()

function(install_clr targetName)
  list(FIND CLR_CROSS_COMPONENTS_LIST ${targetName} INDEX)
  if (NOT DEFINED CLR_CROSS_COMPONENTS_LIST OR NOT ${INDEX} EQUAL -1)
    strip_symbols(${targetName} strip_destination_file)
    # On the older version of cmake (2.8.12) used on Ubuntu 14.04 the TARGET_FILE
    # generator expression doesn't work correctly returning the wrong path and on
    # the newer cmake versions the LOCATION property isn't supported anymore.
    if(CMAKE_VERSION VERSION_EQUAL 3.0 OR CMAKE_VERSION VERSION_GREATER 3.0)
       set(install_source_file $<TARGET_FILE:${targetName}>)
    else()
        get_property(install_source_file TARGET ${targetName} PROPERTY LOCATION)
    endif()

    install(PROGRAMS ${install_source_file} DESTINATION .)
    if(WIN32)
        install(FILES ${CMAKE_CURRENT_BINARY_DIR}/$<CONFIG>/${targetName}.pdb DESTINATION PDB)
    else()
        install(FILES ${strip_destination_file} DESTINATION .)
    endif()
    if(CLR_CMAKE_PGO_INSTRUMENT)
        if(WIN32)
            install(FILES ${CMAKE_CURRENT_BINARY_DIR}/$<CONFIG>/${targetName}.pgd DESTINATION PGD OPTIONAL)
        endif()
    endif()
  endif()
endfunction()

# Disable PAX mprotect that would prevent JIT and other codegen in coreclr from working.
# PAX mprotect prevents:
# - changing the executable status of memory pages that were
#   not originally created as executable,
# - making read-only executable pages writable again,
# - creating executable pages from anonymous memory,
# - making read-only-after-relocations (RELRO) data pages writable again.
function(disable_pax_mprotect targetName)
  if (NOT PAXCTL STREQUAL "PAXCTL-NOTFOUND")
    add_custom_command(
      TARGET ${targetName}
      POST_BUILD
      VERBATIM
      COMMAND ${PAXCTL} -c -m $<TARGET_FILE:${targetName}>
    )
  endif()
endfunction()

function(_add_executable)
    if(NOT WIN32)
      add_executable(${ARGV} ${VERSION_FILE_PATH})
      disable_pax_mprotect(${ARGV})
    else()
      add_executable(${ARGV})
    endif(NOT WIN32)
    list(FIND CLR_CROSS_COMPONENTS_LIST ${ARGV0} INDEX)
    if (DEFINED CLR_CROSS_COMPONENTS_LIST AND ${INDEX} EQUAL -1)
     set_target_properties(${ARGV0} PROPERTIES EXCLUDE_FROM_ALL 1)
    endif()
endfunction()

function(_add_library)
    if(NOT WIN32)
      add_library(${ARGV} ${VERSION_FILE_PATH})
    else()
      add_library(${ARGV})
    endif(NOT WIN32)
    list(FIND CLR_CROSS_COMPONENTS_LIST ${ARGV0} INDEX)
    if (DEFINED CLR_CROSS_COMPONENTS_LIST AND ${INDEX} EQUAL -1)
     set_target_properties(${ARGV0} PROPERTIES EXCLUDE_FROM_ALL 1)
    endif()
endfunction()

function(_install)
    if(NOT DEFINED CLR_CROSS_COMPONENTS_BUILD)
      install(${ARGV})
    endif()
endfunction()

function(verify_dependencies targetName errorMessage)
    set(SANITIZER_BUILD OFF)

    if (CLR_CMAKE_PLATFORM_UNIX)
        if (UPPERCASE_CMAKE_BUILD_TYPE STREQUAL DEBUG OR UPPERCASE_CMAKE_BUILD_TYPE STREQUAL CHECKED)
            string(FIND "$ENV{DEBUG_SANITIZERS}" "asan" __ASAN_POS)
            string(FIND "$ENV{DEBUG_SANITIZERS}" "ubsan" __UBSAN_POS)
            if ((${__ASAN_POS} GREATER -1) OR (${__UBSAN_POS} GREATER -1))
                set(SANITIZER_BUILD ON)
            endif()
        endif()
    endif()

    # We don't need to verify dependencies on OSX, since missing dependencies
    # result in link error over there.
    # Also don't verify dependencies for Asan build because in this case shared
    # libraries can contain undefined symbols
    if (NOT CLR_CMAKE_PLATFORM_DARWIN AND NOT CLR_CMAKE_PLATFORM_ANDROID AND NOT SANITIZER_BUILD)
        add_custom_command(
            TARGET ${targetName}
            POST_BUILD
            VERBATIM
            COMMAND ${CMAKE_SOURCE_DIR}/verify-so.sh
                $<TARGET_FILE:${targetName}>
                ${errorMessage}
            COMMENT "Verifying ${targetName} dependencies"
        )
    endif()
endfunction()

function(add_library_clr)
    _add_library(${ARGV})
endfunction()

function(add_executable_clr)
    _add_executable(${ARGV})
endfunction()