CMakeLists.txt

cmake_minimum_required(VERSION 3.13.4)

if(NOT DEFINED OPENCL_CLANG_BUILD_EXTERNAL)
  # check if we build inside llvm or not
  if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
    set(OPENCL_CLANG_BUILD_EXTERNAL YES)
  endif(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
endif(NOT DEFINED OPENCL_CLANG_BUILD_EXTERNAL)

if(OPENCL_CLANG_BUILD_EXTERNAL)
  project(OPENCL_CLANG
    LANGUAGES
      CXX
      C
  )
endif()

# Do not omit TARGET_OBJECTS expression from the SOURCES target
# property
# `cmake --help-policy CMP0051` for details.
cmake_policy(SET CMP0051 NEW)
cmake_policy(SET CMP0057 NEW)
cmake_policy(SET CMP0022 NEW)

set(CMAKE_MODULE_PATH
  ${CMAKE_MODULE_PATH}
  "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules")

include(CMakeFunctions)

if(CMAKE_CROSSCOMPILING AND OPENCL_CLANG_BUILD_EXTERNAL)
  include(CrossCompile)
  llvm_create_cross_target(${PROJECT_NAME} NATIVE "" Release)
endif()

if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
    set(USE_PREBUILT_LLVM ON)

    add_definitions(-DUSE_PREBUILT_LLVM)

    if(NOT PREFERRED_LLVM_VERSION)
        set(PREFERRED_LLVM_VERSION "20.0")
    endif(NOT PREFERRED_LLVM_VERSION)
    message(STATUS "[OPENCL-CLANG] Looking for LLVM version ${PREFERRED_LLVM_VERSION}")
    find_package(LLVM ${PREFERRED_LLVM_VERSION} REQUIRED)

    message(STATUS "[OPENCL-CLANG] Using LLVMConfig.cmake in: ${LLVM_DIR}")
    message(STATUS "[OPENCL-CLANG] Found LLVM ${LLVM_PACKAGE_VERSION}")

    set(CMAKE_MODULE_PATH
      ${CMAKE_MODULE_PATH}
      ${LLVM_CMAKE_DIR})

    set(CMAKE_CXX_STANDARD 17)
    set(CMAKE_CXX_STANDARD_REQUIRED ON)

    option(LLVMSPIRV_INCLUDED_IN_LLVM
      "Set to ON if libLLVMSPIRVLib is linked into libLLVM" ON)
    if(LLVMSPIRV_INCLUDED_IN_LLVM)
        message(STATUS "[OPENCL-CLANG] Assuming that libLLVMSPIRVLib is linked into libLLVM")
    else(LLVMSPIRV_INCLUDED_IN_LLVM)
        message(STATUS
          "[OPENCL-CLANG] Assuming that libLLVMSPIRVLib is NOT linked into libLLVM")
        if(NOT SPIRV_TRANSLATOR_DIR)
            message(FATAL_ERROR "[OPENCL-CLANG] SPIRV_TRANSLATOR_DIR is required")
        endif(NOT SPIRV_TRANSLATOR_DIR)
    endif(LLVMSPIRV_INCLUDED_IN_LLVM)
else(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
    set(USE_PREBUILT_LLVM OFF)
    find_package(Git REQUIRED)
endif(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)

include(AddLLVM)
include(TableGen)

if (NOT WIN32)
    add_subdirectory( linux_linker bin)
endif()

use_rtti(FALSE)
use_eh(TRUE)

if (CMAKE_SIZEOF_VOID_P EQUAL 4)
  set(ADDR 32)
elseif (CMAKE_SIZEOF_VOID_P EQUAL 8)
  set(ADDR 64)
else ()
  # CMAKE_SIZEOF_VOID_P might not be set on windows x86 in in-tree build
  message(WARNING "[OPENCL-CLANG] CMAKE_SIZEOF_VOID_P is not set")
  if (WIN32 AND LLVM_BUILD_32_BITS)
    set(ADDR 32)
  endif()
endif (CMAKE_SIZEOF_VOID_P EQUAL 4)

# set windows binary suffix
if (WIN32)
    set (BUILD_PLATFORM ${ADDR})
else (WIN32)
    set (BUILD_PLATFORM "")
endif (WIN32)

# set that name of the main output file as a target name
if (NOT DEFINED OPENCL_CLANG_LIBRARY_NAME)
    set(OPENCL_CLANG_LIBRARY_NAME "opencl-clang")
endif()
set(TARGET_NAME ${OPENCL_CLANG_LIBRARY_NAME}${BUILD_PLATFORM} )

# OPENCL_CLANG_PCH_EXTENSION can override PCH extension map in options_compile.cpp.
# Example: "cl_khr_3d_image_writes,cl_khr_depth_images"
set(OPENCL_CLANG_PCH_EXTENSION "" CACHE STRING "Comma-separated list of OpenCL extensions")
if (NOT "${OPENCL_CLANG_PCH_EXTENSION}" STREQUAL "")
  add_definitions(-DPCH_EXTENSION="${OPENCL_CLANG_PCH_EXTENSION}")
endif()

if(NOT USE_PREBUILT_LLVM)

    if(NOT LLVM_EXTERNAL_CLANG_SOURCE_DIR)
        set(CLANG_SOURCE_DIR ${LLVM_SOURCE_DIR}/tools/clang)
    elseif(EXISTS "${LLVM_EXTERNAL_CLANG_SOURCE_DIR}/CMakeLists.txt")
        set(CLANG_SOURCE_DIR "${LLVM_EXTERNAL_CLANG_SOURCE_DIR}")
    endif()
    if(EXISTS ${CLANG_SOURCE_DIR})
        message(STATUS "[OPENCL-CLANG] Using Clang source code direcotry: ${CLANG_SOURCE_DIR}")
    else()
        message(FATAL_ERROR
            "[OPENCL-CLANG] Can't find Clang source code directory!\n"
            "If you are using LLVM monorepo:\n"
            "  1. Clean CMake cache: `rm CMakeCache.txt`\n"
            "  2. Enable Clang project with `-DLLVM_ENABLE_PROJECTS=\"clang\"` option\n"
            "If Clang is used as a separate repository (not monorepo), it should "
            "be checked out at `llvm/tools/clang`."
        )
    endif()

    if(NOT LLVM_EXTERNAL_LLVM_SPIRV_SOURCE_DIR)
        set(SPIRV_SOURCE_DIR ${LLVM_SOURCE_DIR}/projects/llvm-spirv)
    elseif(EXISTS "${LLVM_EXTERNAL_LLVM_SPIRV_SOURCE_DIR}/CMakeLists.txt")
        set(SPIRV_SOURCE_DIR ${LLVM_EXTERNAL_LLVM_SPIRV_SOURCE_DIR})
    endif()
    if(EXISTS ${SPIRV_SOURCE_DIR})
        message(STATUS "[OPENCL-CLANG] Using SPIRV-LLVM-Translator source code directory: ${SPIRV_SOURCE_DIR}")
    else()
        message(FATAL_ERROR
            "[OPENCL-CLANG] Can't find SPIRV-LLVM-Translator source code dir!\n"
            "If you are using LLVM monorepo, SPIRV-LLVM-Translator should be checked out "
            "at '<monorepo_root_dir>/llvm-spirv' and it should be enabled as an external LLVM "
            "project using the following 2 options:\n"
            "  -DLLVM_EXTERNAL_PROJECTS=\"opencl-clang;llvm-spirv\"\n"
            "  -DLLVM_EXTERNAL_LLVM_SPIRV_SOURCE_DIR=\"<monorepo_root_dir>/llvm-spirv\"\n"
            "If you are not using LLVM monorepo, SPIRV-LLVM-Translator should be checked "
            "out at `llvm/projects/llvm-spirv`"
        )
    endif()

    set(CLANG_BASE_REVISION master)
    set(SPIRV_BASE_REVISION master)
    set(TARGET_BRANCH "ocl-open-110")

    apply_patches(${CLANG_SOURCE_DIR}
                  ${CMAKE_CURRENT_SOURCE_DIR}/patches/clang
                  ${CLANG_BASE_REVISION}
                  ${TARGET_BRANCH})
    apply_patches(${SPIRV_SOURCE_DIR}
                  ${CMAKE_CURRENT_SOURCE_DIR}/patches/spirv
                  ${SPIRV_BASE_REVISION}
                  ${TARGET_BRANCH})
endif(NOT USE_PREBUILT_LLVM)

#
# TblGen the options include file
#
set (COMPILE_OPTIONS_TD  opencl_clang_options.td)
set (COMPILE_OPTIONS_INC opencl_clang_options.inc)

find_program(LLVM_TABLEGEN_EXE "llvm-tblgen" ${LLVM_TOOLS_BINARY_DIR})
set(LLVM_TARGET_DEFINITIONS ${COMPILE_OPTIONS_TD})
if(USE_PREBUILT_LLVM)
  set(TABLEGEN_ADDITIONAL -I ${LLVM_INCLUDE_DIRS})
else(USE_PREBUILT_LLVM)
  set(TABLEGEN_ADDITIONAL "")
endif(USE_PREBUILT_LLVM)
tablegen(LLVM ${COMPILE_OPTIONS_INC} -gen-opt-parser-defs ${TABLEGEN_ADDITIONAL})
add_public_tablegen_target(CClangCompileOptions)

#
# Source code
#
set(TARGET_INCLUDE_FILES
    opencl_clang.h
    options.h
    binary_result.h
    pch_mgr.h
    ${COMPILE_OPTIONS_TD}
    ${COMPILE_OPTIONS_INC}
)

set(TARGET_SOURCE_FILES
    opencl_clang.cpp
    options.cpp
    pch_mgr.cpp
    options_compile.cpp
)

#
# Resources
#

set( PRODUCT_VER_MAJOR 2 )
set( PRODUCT_VER_MINOR 0 )
set (LLVM_VER_MAJOR ${LLVM_VERSION_MAJOR} )
set (LLVM_VER_MINOR ${LLVM_VERSION_MINOR} )

add_definitions( -D__STDC_LIMIT_MACROS )
add_definitions( -D__STDC_CONSTANT_MACROS )
add_definitions( -DOPENCL_CLANG_EXPORTS )

#
# Include directories
#

if(NOT USE_PREBUILT_LLVM)
    set(CLANG_BINARY_DIR ${LLVM_BINARY_DIR}/tools/clang/)
    include_directories(
        ${CLANG_BINARY_DIR}/include  # for tablegened includes
        ${CLANG_SOURCE_DIR}/include  # for basic headers
        ${SPIRV_SOURCE_DIR}/include) # for SPIRV headers
endif(NOT USE_PREBUILT_LLVM)

if(USE_PREBUILT_LLVM AND NOT LLVMSPIRV_INCLUDED_IN_LLVM)
    include_directories(${SPIRV_TRANSLATOR_DIR}/include)
    link_directories(${SPIRV_TRANSLATOR_DIR}/lib${LLVM_LIBDIR_SUFFIX})
endif(USE_PREBUILT_LLVM AND NOT LLVMSPIRV_INCLUDED_IN_LLVM)

include_directories( AFTER
            ${LLVM_INCLUDE_DIRS}
            ${CMAKE_CURRENT_BINARY_DIR}
            ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}
            )

link_directories(
    ${LLVM_LIBRARY_DIRS}
)

set(OPENCL_CLANG_LINK_LIBS ${CMAKE_DL_LIBS})

if(NOT LLVMSPIRVLib IN_LIST LLVM_AVAILABLE_LIBS OR (USE_PREBUILT_LLVM AND LLVM_LINK_LLVM_DYLIB))
  # SPIRV-LLVM-Translator is not included into LLVM as a component.
  # So, we need to list it here explicitly as an external library
  list(APPEND OPENCL_CLANG_LINK_LIBS LLVMSPIRVLib)
endif()

add_subdirectory(cl_headers)

set(LLVM_REQUIRES_EH ON)

if(USE_PREBUILT_LLVM OR CLANG_LINK_CLANG_DYLIB)
  list(APPEND OPENCL_CLANG_LINK_LIBS clang-cpp)
else()
  list(APPEND OPENCL_CLANG_LINK_LIBS
    clangBasic
    clangFrontend
    clangFrontendTool
    clangSerialization
  )
endif()

if(USE_PREBUILT_LLVM AND UNIX)
  # llvm_map_components_to_libnames(... all) returns empty string if llvm is
  # pre-built locally in either static or shared type in Ubuntu 22.04 container.
  find_program(LLVM_CONFIG_EXE
    NAMES llvm-config-${PREFERRED_LLVM_VERSION} llvm-config
    PATHS ${LLVM_BINARY_DIR} ${LLVM_BINARY_DIR}/bin)
  if(NOT LLVM_CONFIG_EXE)
    message(FATAL_ERROR "[OPENCL-CLANG] llvm-config is not found")
  endif()

  execute_process(COMMAND ${LLVM_CONFIG_EXE} --libs all OUTPUT_VARIABLE ALL_LIBS)
  string(REGEX REPLACE "( |\r|\n|-l)+" ";" ALL_LLVM_LIBS ${ALL_LIBS})
  set(ALL_LLVM_LIBS "LLVMSPIRVLib${ALL_LLVM_LIBS}")
else()
  llvm_map_components_to_libnames(ALL_LLVM_LIBS all)
endif()
set(OPENCL_CLANG_EXCLUDE_LIBS_FROM_ALL "" CACHE STRING "Space-separated list of LLVM libraries to exclude from all")
if (NOT "${OPENCL_CLANG_EXCLUDE_LIBS_FROM_ALL}" STREQUAL "")
  list(REMOVE_ITEM ALL_LLVM_LIBS ${OPENCL_CLANG_EXCLUDE_LIBS_FROM_ALL})
endif()
list(APPEND OPENCL_CLANG_LINK_LIBS ${ALL_LLVM_LIBS})

add_llvm_library(${TARGET_NAME} SHARED
  ${TARGET_INCLUDE_FILES}
  ${TARGET_SOURCE_FILES}
  $<TARGET_OBJECTS:cl_headers>

  DEPENDS CClangCompileOptions

  LINK_LIBS
    ${OPENCL_CLANG_LINK_LIBS}
  )

if (WIN32)
    # Enable compiler generation of Control Flow Guard security checks.
    target_compile_options(${TARGET_NAME} PUBLIC "/guard:cf")
    set_property(TARGET ${TARGET_NAME} APPEND PROPERTY
        LINK_OPTIONS "LINKER:/DYNAMICBASE" "LINKER:/GUARD:CF")

elseif(UNIX)
    set_property(TARGET ${TARGET_NAME} APPEND_STRING PROPERTY
        COMPILE_DEFINITIONS LIBOPENCL_CLANG_NAME="$<TARGET_SONAME_FILE_NAME:${TARGET_NAME}>")
    
    # Sanitizers do not support this flag, disable this when under sanitizer build
    if(NOT LLVM_USE_SANITIZER)
        set_property(TARGET ${TARGET_NAME} APPEND_STRING PROPERTY
            LINK_FLAGS " -Wl,--no-undefined")
    endif()
endif(WIN32)

install(FILES opencl_clang.h
        DESTINATION include/cclang
        COMPONENT ${TARGET_NAME})

#
# Stripped PDB files
#
if (WIN32)
    get_target_property(RT_OUTPUT_DIRECTORY ${TARGET_NAME} RUNTIME_OUTPUT_DIRECTORY)
    file(TO_NATIVE_PATH ${RT_OUTPUT_DIRECTORY}/${CMAKE_CFG_INTDIR}/${TARGET_NAME}_stripped.pdb PDB_NAME)
    if (${MSVC_VERSION} EQUAL 1500)
        # Visual Studio 2008
        set_property(TARGET ${TARGET_NAME} APPEND PROPERTY LINK_OPTIONS "LINKER:/PDBSTRIPPED:${PDB_NAME}")
    else (${MSVC_VERSION} EQUAL 1500)
        # Visual Studio 2010 (assumed if not Visual Studio 2008)
        # This is a fix due to a bug in CMake, Does not add the flag /DEBUG to the linker flags in Release mode.
        # The /DEBUG flag is required in order to create stripped pdbs.
        set_property(TARGET ${TARGET_NAME} APPEND PROPERTY LINK_OPTIONS $<$<CONFIG:Release>:LINKER:/DEBUG> "$<$<CONFIG:Debug,Release>:LINKER:/PDBSTRIPPED:${PDB_NAME}>")
    endif (${MSVC_VERSION} EQUAL 1500)
    if (INSTALL_PDBS)
        install(FILES ${RT_OUTPUT_DIRECTORY}/\${BUILD_TYPE}/${TARGET_NAME}.pdb DESTINATION bin)
    endif(INSTALL_PDBS)
    install(FILES ${RT_OUTPUT_DIRECTORY}/\${BUILD_TYPE}/${TARGET_NAME}_stripped.pdb DESTINATION bin)
else (WIN32)
    SET_LINUX_EXPORTS_FILE( ${TARGET_NAME} opencl_clang.map )
endif(WIN32)