##
##  Copyright 2020-2021 Leonid Yuriev <leo@yuriev.ru>
##  and other libmdbx authors: please see AUTHORS file.
##  All rights reserved.
##
##  Redistribution and use in source and binary forms, with or without
##  modification, are permitted only as authorized by the OpenLDAP
##  Public License.
##
##  A copy of this license is available in the file LICENSE in the
##  top-level directory of the distribution or, alternatively, at
##  <http://www.OpenLDAP.org/license.html>.
##

##
##  libmdbx = { Revised and extended descendant of Symas LMDB. }
##  Please see README.md at https://github.com/erthink/libmdbx
##
##  Libmdbx is superior to LMDB in terms of features and reliability,
##  not inferior in performance. libmdbx works on Linux, FreeBSD, MacOS X
##  and other systems compliant with POSIX.1-2008, but also support Windows
##  as a complementary platform.
##
##  The next version is under active non-public development and will be
##  released as MithrilDB and libmithrildb for libraries & packages.
##  Admittedly mythical Mithril is resembling silver but being stronger and
##  lighter than steel. Therefore MithrilDB is rightly relevant name.
##
##  MithrilDB will be radically different from libmdbx by the new database
##  format and API based on C++17, as well as the Apache 2.0 License.
##  The goal of this revolution is to provide a clearer and robust API,
##  add more features and new valuable properties of database.
##
##  The Future will (be) Positive. Всё будет хорошо.
##

cmake_minimum_required(VERSION 3.11)

cmake_policy(PUSH)
cmake_policy(VERSION 3.8.2)
if(NOT CMAKE_VERSION VERSION_LESS 3.15)
  cmake_policy(SET CMP0091 NEW)
endif()
if(NOT CMAKE_VERSION VERSION_LESS 3.13)
  cmake_policy(SET CMP0077 NEW)
endif()
if(NOT CMAKE_VERSION VERSION_LESS 3.12)
  cmake_policy(SET CMP0075 NEW)
endif()
if(NOT CMAKE_VERSION VERSION_LESS 3.9)
  cmake_policy(SET CMP0069 NEW)
  include(CheckIPOSupported)
  check_ipo_supported(RESULT CMAKE_INTERPROCEDURAL_OPTIMIZATION_AVAILABLE)
else()
  set(CMAKE_INTERPROCEDURAL_OPTIMIZATION_AVAILABLE FALSE)
endif()

if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/.git" AND
    EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/test/CMakeLists.txt" AND
    EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/src/core.c" AND
    EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/src/alloy.c" AND
    EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/src/config.h.in" AND
    EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/src/version.c.in" AND
    EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/src/man1" AND
    EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/src/mdbx_chk.c" AND
    EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/src/mdbx.c++")
  set(MDBX_AMALGAMATED_SOURCE FALSE)
  find_program(GIT git)
  if(NOT GIT)
    message(SEND_ERROR "Git command-line tool not found")
  endif()
  set(MDBX_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/src")
elseif(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/VERSION" AND
    EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/mdbx.c" AND
    EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/mdbx.c++" AND
    EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/config.h.in" AND
    EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/man1" AND
    EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/mdbx_chk.c")
  set(MDBX_AMALGAMATED_SOURCE TRUE)
  set(MDBX_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
else()
  message(FATAL_ERROR "Please use libmdbx as a git-submodule or the amalgamated source code")
endif()

if(DEFINED PROJECT_NAME)
  set(SUBPROJECT ON)
  set(NOT_SUBPROJECT OFF)
  if(NOT MDBX_AMALGAMATED_SOURCE AND NOT DEFINED BUILD_TESTING)
    set(BUILD_TESTING OFF)
  endif()
  enable_language(C)
else()
  set(SUBPROJECT OFF)
  set(NOT_SUBPROJECT ON)
  project(libmdbx C)
  if(NOT MDBX_AMALGAMATED_SOURCE AND NOT DEFINED BUILD_TESTING)
    set(BUILD_TESTING ON)
  endif()
endif()

if(MDBX_AMALGAMATED_SOURCE AND DEFINED MDBX_ENABLE_TESTS AND MDBX_ENABLE_TESTS)
  message(WARNING "MDBX_ENABLE_TESTS=${MDBX_ENABLE_TESTS}: But amalgamated source code don't includes tests.")
  set(MDBX_ENABLE_TESTS OFF)
endif()

# Try to find a C++ compiler unless sure that this is unnecessary.
if (NOT CMAKE_CXX_COMPILER_LOADED)
  include(CheckLanguage)
  if(NOT DEFINED MDBX_BUILD_CXX OR MDBX_BUILD_CXX
      OR (NOT MDBX_AMALGAMATED_SOURCE AND (NOT DEFINED MDBX_ENABLE_TESTS OR MDBX_ENABLE_TESTS)))
    check_language(CXX)
    if(CMAKE_CXX_COMPILER)
      enable_language(CXX)
    endif()
  endif()
else()
  enable_language(CXX)
endif()

if(NOT CMAKE_BUILD_TYPE)
  set(CMAKE_BUILD_TYPE MinSizeRel CACHE STRING
    "Choose the type of build, options are: Debug Release RelWithDebInfo MinSizeRel."
    FORCE)
endif()

if(NOT_SUBPROJECT AND (CMAKE_CROSSCOMPILING OR IOS))
  set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
endif()

if(NOT "$ENV{TEAMCITY_PROCESS_FLOW_ID}" STREQUAL "")
  set(CI TEAMCITY)
  message(STATUS "TeamCity CI")
elseif(NOT "$ENV{TRAVIS}" STREQUAL "")
  set(CI TRAVIS)
  message(STATUS "Travis CI")
elseif(NOT "$ENV{CIRCLECI}" STREQUAL "")
  set(CI CIRCLE)
  message(STATUS "Circle CI")
elseif(NOT "$ENV{APPVEYOR}" STREQUAL "")
  set(CI APPVEYOR)
  message(STATUS "AppVeyor CI")
elseif(NOT "$ENV{CI}" STREQUAL "")
  set(CI "$ENV{CI}")
  message(STATUS "Other CI (${CI})")
else()
  message(STATUS "Assume No any CI environment")
  unset(CI)
endif()

# output all mdbx-related targets in single directory
if(NOT DEFINED MDBX_OUTPUT_DIR)
  set(MDBX_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR})
endif()
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${MDBX_OUTPUT_DIR})
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${MDBX_OUTPUT_DIR})
set(CMAKE_PDB_OUTPUT_DIRECTORY ${MDBX_OUTPUT_DIR})
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${MDBX_OUTPUT_DIR})

include(CheckFunctionExists)
include(FindPackageMessage)
include(GNUInstallDirs)

if(CMAKE_C_COMPILER_ID STREQUAL "MSVC" AND MSVC_VERSION LESS 1900)
  message(SEND_ERROR "MSVC compiler ${MSVC_VERSION} is too old for building MDBX."
    " At least 'Microsoft Visual Studio 2015' is required.")
endif()

# Set default build type to Release. This is to ease a User's life.
if(NOT CMAKE_BUILD_TYPE)
  set(CMAKE_BUILD_TYPE Release CACHE STRING
    "Choose the type of build, options are: Debug Release RelWithDebInfo MinSizeRel."
    FORCE)
endif()
string(TOUPPER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE_UPPERCASE)

set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
set(THREADS_PREFER_PTHREAD_FLAG TRUE)
find_package(Threads REQUIRED)

include(cmake/utils.cmake)
include(cmake/compiler.cmake)
include(cmake/profile.cmake)

# Workaround for `-pthread` toolchain/cmake bug
if(NOT APPLE AND NOT MSVC
    AND CMAKE_USE_PTHREADS_INIT AND NOT CMAKE_THREAD_LIBS_INIT
    AND (CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_CLANG))
  check_compiler_flag("-pthread" CC_HAS_PTHREAD)
  if(CC_HAS_PTHREAD AND NOT CMAKE_EXE_LINKER_FLAGS MATCHES "-pthread")
    message(STATUS "Force add -pthread for linker flags to avoid troubles")
    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -pthread")
    set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -pthread")
    set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -pthread")
  endif()
endif()

CHECK_FUNCTION_EXISTS(pow NOT_NEED_LIBM)
if(NOT_NEED_LIBM)
  set(LIB_MATH "")
else()
  set(CMAKE_REQUIRED_LIBRARIES m)
  CHECK_FUNCTION_EXISTS(pow HAVE_LIBM)
  if(HAVE_LIBM)
    set(LIB_MATH m)
  else()
    message(FATAL_ERROR "No libm found for math support")
  endif()
endif()

if(SUBPROJECT)
  if(NOT DEFINED BUILD_SHARED_LIBS)
    option(BUILD_SHARED_LIBS "Build shared libraries (DLLs)" OFF)
  endif()
  if(NOT DEFINED CMAKE_POSITION_INDEPENDENT_CODE)
    option(CMAKE_POSITION_INDEPENDENT_CODE "Generate position independent (PIC)" ON)
  endif()
else()
  option(BUILD_SHARED_LIBS "Build shared libraries (DLLs)" ON)
  option(CMAKE_POSITION_INDEPENDENT_CODE "Generate position independent (PIC)" ON)
  if (CC_HAS_ARCH_NATIVE)
    option(BUILD_FOR_NATIVE_CPU "Generate code for the compiling machine CPU" OFF)
  endif()

  if(CMAKE_CONFIGURATION_TYPES OR NOT CMAKE_BUILD_TYPE_UPPERCASE STREQUAL "DEBUG")
    set(INTERPROCEDURAL_OPTIMIZATION_DEFAULT ON)
  else()
    set(INTERPROCEDURAL_OPTIMIZATION_DEFAULT OFF)
  endif()

  if(CMAKE_INTERPROCEDURAL_OPTIMIZATION_AVAILABLE
      OR GCC_LTO_AVAILABLE OR MSVC_LTO_AVAILABLE OR CLANG_LTO_AVAILABLE)
    option(INTERPROCEDURAL_OPTIMIZATION "Enable interprocedural/LTO optimization" ${INTERPROCEDURAL_OPTIMIZATION_DEFAULT})
  endif()

  if(INTERPROCEDURAL_OPTIMIZATION)
    if(GCC_LTO_AVAILABLE)
      set(LTO_ENABLED TRUE)
      set(CMAKE_AR ${CMAKE_GCC_AR} CACHE PATH "Path to ar program with LTO-plugin" FORCE)
      set(CMAKE_NM ${CMAKE_GCC_NM} CACHE PATH "Path to nm program with LTO-plugin" FORCE)
      set(CMAKE_RANLIB ${CMAKE_GCC_RANLIB} CACHE PATH "Path to ranlib program with LTO-plugin" FORCE)
      message(STATUS "MDBX indulge Link-Time Optimization by GCC")
    elseif(CLANG_LTO_AVAILABLE)
      set(LTO_ENABLED TRUE)
      set(CMAKE_AR ${CMAKE_CLANG_AR} CACHE PATH "Path to ar program with LTO-plugin" FORCE)
      set(CMAKE_NM ${CMAKE_CLANG_NM} CACHE PATH "Path to nm program with LTO-plugin" FORCE)
      set(CMAKE_RANLIB ${CMAKE_CLANG_RANLIB} CACHE PATH "Path to ranlib program with LTO-plugin" FORCE)
      message(STATUS "MDBX indulge Link-Time Optimization by CLANG")
    elseif(MSVC_LTO_AVAILABLE)
      set(LTO_ENABLED TRUE)
      message(STATUS "MDBX indulge Link-Time Optimization by MSVC")
    elseif(CMAKE_INTERPROCEDURAL_OPTIMIZATION_AVAILABLE)
      message(STATUS "MDBX indulge Interprocedural Optimization by CMake")
      set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
      set(LTO_ENABLED TRUE)
    else()
      message(WARNING "Unable to engage interprocedural/LTO optimization.")
    endif()
  else()
    set(CMAKE_INTERPROCEDURAL_OPTIMIZATION FALSE)
    set(LTO_ENABLED FALSE)
  endif()

  if(NOT MDBX_AMALGAMATED_SOURCE)
    find_program(VALGRIND valgrind)
    if(VALGRIND)
      # LY: cmake is ugly and nasty.
      #      - therefore memcheck-options should be defined before including ctest;
      #      - otherwise ctest may ignore it.
      set(MEMORYCHECK_SUPPRESSIONS_FILE
        "${CMAKE_CURRENT_SOURCE_DIR}/test/valgrind_suppress.txt"
        CACHE FILEPATH "Suppressions file for Valgrind" FORCE)
      set(MEMORYCHECK_COMMAND_OPTIONS
        "--trace-children=yes --leak-check=full --track-origins=yes --error-exitcode=42 --error-markers=@ --errors-for-leak-kinds=definite --fair-sched=yes --suppressions=${MEMORYCHECK_SUPPRESSIONS_FILE}"
        CACHE STRING "Valgrind options" FORCE)
      set(VALGRIND_COMMAND_OPTIONS "${MEMORYCHECK_COMMAND_OPTIONS}" CACHE STRING "Valgrind options" FORCE)
    endif()

    # Enable 'make tags' target.
    find_program(CTAGS ctags)
    if(CTAGS)
      add_custom_target(tags COMMAND ${CTAGS} -R -f tags
        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
      add_custom_target(ctags DEPENDS tags)
    endif(CTAGS)

    if(UNIX)
      find_program(CLANG_FORMAT
        NAMES clang-format-12 clang-format-11 clang-format-10 clang-format)
      if(CLANG_FORMAT)
        execute_process(COMMAND ${CLANG_FORMAT} "--version" OUTPUT_VARIABLE clang_format_version_info)
        string(REGEX MATCH "version ([0-9]+)\\.([0-9]+)\\.([0-9]+)(.*)?" clang_format_version_info CLANG_FORMAT_VERSION)
        if(clang_format_version_info AND NOT CLANG_FORMAT_VERSION VERSION_LESS 10.0)
          # Enable 'make reformat' target.
          add_custom_target(reformat
            VERBATIM
            COMMAND
            git ls-files |
            grep -E \\.\(c|cxx|cc|cpp|h|hxx|hpp\)\(\\.in\)?\$ |
            xargs ${CLANG_FORMAT} -i --style=file
            WORKING_DIRECTORY ${CMAKE_SOURCE_DIR})
        endif()
      endif()
    endif()

    if(NOT "${PROJECT_BINARY_DIR}" STREQUAL "${PROJECT_SOURCE_DIR}")
      add_custom_target(distclean)
      add_custom_command(TARGET distclean
        COMMAND ${CMAKE_COMMAND} -E remove_directory "${PROJECT_BINARY_DIR}"
        COMMENT "Removing the build directory and its content")
    elseif(IS_DIRECTORY .git AND GIT)
      add_custom_target(distclean)
      add_custom_command(TARGET distclean
        WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
        COMMAND ${GIT} submodule foreach --recursive git clean -f -X -d
        COMMAND ${GIT} clean -f -X -d
        COMMENT "Removing all build files from the source directory")
    endif()
  endif(NOT MDBX_AMALGAMATED_SOURCE)

  setup_compile_flags()
endif(SUBPROJECT)

list(FIND CMAKE_C_COMPILE_FEATURES c_std_11 HAS_C11)
list(FIND CMAKE_CXX_COMPILE_FEATURES cxx_std_11 HAS_CXX11)
list(FIND CMAKE_CXX_COMPILE_FEATURES cxx_std_14 HAS_CXX14)
list(FIND CMAKE_CXX_COMPILE_FEATURES cxx_std_17 HAS_CXX17)
list(FIND CMAKE_CXX_COMPILE_FEATURES cxx_std_20 HAS_CXX20)
if(NOT DEFINED MDBX_CXX_STANDARD)
  if(DEFINED CMAKE_CXX_STANDARD)
    set(MDBX_CXX_STANDARD ${CMAKE_CXX_STANDARD})
  elseif(NOT HAS_CXX20 LESS 0)
    set(MDBX_CXX_STANDARD 20)
  elseif(NOT HAS_CXX17 LESS 0)
    set(MDBX_CXX_STANDARD 17)
  elseif(NOT HAS_CXX14 LESS 0)
    set(MDBX_CXX_STANDARD 14)
  elseif(NOT HAS_CXX11 LESS 0)
    set(MDBX_CXX_STANDARD 11)
  else()
    set(MDBX_CXX_STANDARD 98)
  endif()
endif()
if(NOT DEFINED MDBX_C_STANDARD)
  # MSVC >= 19.28 (Microsoft Visual Studio 16.8) is mad!
  #               It unable process Windows SDK headers in the C11 mode!
  if(HAS_C11 LESS 0 OR (MSVC AND MSVC_VERSION GREATER 1927))
    set(MDBX_C_STANDARD 99)
  else()
    set(MDBX_C_STANDARD 11)
  endif()
endif()

if(${CMAKE_SYSTEM_NAME} STREQUAL "Windows" AND EXISTS "${MDBX_SOURCE_DIR}/ntdll.def")
  if(MSVC)
    if(NOT MSVC_LIB_EXE)
      # Find lib.exe
      get_filename_component(CL_NAME ${CMAKE_C_COMPILER} NAME)
      string(REPLACE cl.exe lib.exe MSVC_LIB_EXE "${CL_NAME}")
      find_program(MSVC_LIB_EXE ${MSVC_LIB_EXE})
    endif()
    if(MSVC_LIB_EXE)
      message(STATUS "Found MSVC's lib tool: ${MSVC_LIB_EXE}")
      set(MDBX_NTDLL_EXTRA_IMPLIB "${CMAKE_CURRENT_BINARY_DIR}/mdbx_ntdll_extra.lib")
      add_custom_command(OUTPUT "${MDBX_NTDLL_EXTRA_IMPLIB}"
        COMMENT "Create extra-import-library for ntdll.dll"
        MAIN_DEPENDENCY "${MDBX_SOURCE_DIR}/ntdll.def"
        COMMAND ${MSVC_LIB_EXE} /def:"${MDBX_SOURCE_DIR}/ntdll.def" /out:"${MDBX_NTDLL_EXTRA_IMPLIB}" ${INITIAL_CMAKE_STATIC_LINKER_FLAGS})
    else()
      message(WARNING "MSVC's lib tool not found")
    endif()
  elseif(MINGW OR MINGW64)
    if(NOT DLLTOOL)
      # Find dlltool
      get_filename_component(GCC_NAME ${CMAKE_C_COMPILER} NAME)
      string(REPLACE gcc dlltool DLLTOOL_NAME "${GCC_NAME}")
      find_program(DLLTOOL NAMES ${DLLTOOL_NAME})
    endif()
    if(DLLTOOL)
      message(STATUS "Found dlltool: ${DLLTOOL}")
      set(MDBX_NTDLL_EXTRA_IMPLIB "${CMAKE_CURRENT_BINARY_DIR}/mdbx_ntdll_extra.a")
      add_custom_command(OUTPUT "${MDBX_NTDLL_EXTRA_IMPLIB}"
        COMMENT "Create extra-import-library for ntdll.dll"
        MAIN_DEPENDENCY "${MDBX_SOURCE_DIR}/ntdll.def"
        COMMAND ${DLLTOOL} -d "${MDBX_SOURCE_DIR}/ntdll.def" -l "${MDBX_NTDLL_EXTRA_IMPLIB}")
    else()
      message(WARNING "dlltool not found")
    endif()
  endif()

  if(MDBX_NTDLL_EXTRA_IMPLIB)
    # LY: Sometimes CMake requires a nightmarish magic for simple things.
    # 1) create a target out of the library compilation result
    add_custom_target(ntdll_extra_target DEPENDS "${MDBX_NTDLL_EXTRA_IMPLIB}")
    # 2) create an library target out of the library compilation result
    add_library(ntdll_extra STATIC IMPORTED GLOBAL)
    add_dependencies(ntdll_extra ntdll_extra_target)
    # 3) specify where the library is (and where to find the headers)
    set_target_properties(ntdll_extra
      PROPERTIES
      IMPORTED_LOCATION "${MDBX_NTDLL_EXTRA_IMPLIB}")
  endif()
endif()

################################################################################
################################################################################
#
#           ####   #####    #####     #     ####   #    #   ####
#          #    #  #    #     #       #    #    #  ##   #  #
#          #    #  #    #     #       #    #    #  # #  #   ####
#          #    #  #####      #       #    #    #  #  # #       #
#          #    #  #          #       #    #    #  #   ##  #    #
#           ####   #          #       #     ####   #    #   ####
#

set(MDBX_BUILD_OPTIONS ENABLE_ASAN MDBX_USE_VALGRIND ENABLE_GPROF ENABLE_GCOV)
macro(add_mdbx_option NAME DESCRIPTION DEFAULT)
  list(APPEND MDBX_BUILD_OPTIONS ${NAME})
  if(NOT ${DEFAULT} STREQUAL "AUTO")
    option(${NAME} "${DESCRIPTION}" ${DEFAULT})
  elseif(NOT DEFINED ${NAME})
    set(${NAME}_AUTO ON)
  endif()
endmacro()

if(IOS)
  set(MDBX_BUILD_TOOLS_DEFAULT OFF)
  if(NOT_SUBPROJECT)
    cmake_policy(SET CMP0006 OLD)
    set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_ALLOWED "NO")
  endif()
else()
  set(MDBX_BUILD_TOOLS_DEFAULT ON)
endif()

add_mdbx_option(MDBX_INSTALL_STATIC "Build and install libmdbx for static linking" OFF)
add_mdbx_option(MDBX_BUILD_SHARED_LIBRARY "Build libmdbx as shared library (DLL)" ${BUILD_SHARED_LIBS})
add_mdbx_option(MDBX_BUILD_TOOLS "Build MDBX tools (mdbx_chk/stat/dump/load/copy)" ${MDBX_BUILD_TOOLS_DEFAULT})
CMAKE_DEPENDENT_OPTION(MDBX_INSTALL_MANPAGES "Install man-pages for MDBX tools (mdbx_chk/stat/dump/load/copy)" ON MDBX_BUILD_TOOLS OFF)
add_mdbx_option(MDBX_TXN_CHECKOWNER "Checking transaction matches the calling thread inside libmdbx's API" ON)
add_mdbx_option(MDBX_ENV_CHECKPID "Paranoid checking PID inside libmdbx's API" AUTO)
mark_as_advanced(MDBX_ENV_CHECKPID)
if(${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
  add_mdbx_option(MDBX_DISABLE_GNU_SOURCE "Don't use GNU/Linux libc extensions" OFF)
  mark_as_advanced(MDBX_DISABLE_GNU_SOURCE)
endif()
if(${CMAKE_SYSTEM_NAME} STREQUAL "Darwin" OR IOS)
  add_mdbx_option(MDBX_OSX_SPEED_INSTEADOF_DURABILITY "Disable use fcntl(F_FULLFSYNC) in favor of speed" OFF)
  mark_as_advanced(MDBX_OSX_SPEED_INSTEADOF_DURABILITY)
endif()
if(${CMAKE_SYSTEM_NAME} STREQUAL "Windows")
  if(MDBX_NTDLL_EXTRA_IMPLIB)
    add_mdbx_option(MDBX_AVOID_CRT "Avoid dependence from MSVC CRT and use ntdll.dll instead" OFF)
  endif()
  add_mdbx_option(MDBX_CONFIG_MANUAL_TLS_CALLBACK
    "Provide mdbx_dll_handler() for manual initialization" OFF)
  mark_as_advanced(MDBX_CONFIG_MANUAL_TLS_CALLBACK)
else()
  add_mdbx_option(MDBX_USE_OFDLOCKS "Use Open file description locks (aka OFD locks, non-POSIX)" AUTO)
  mark_as_advanced(MDBX_USE_OFDLOCKS)
endif()
add_mdbx_option(MDBX_LOCKING "Locking method (Win32=-1, SysV=5, POSIX=1988, POSIX=2001, POSIX=2008, Futexes=1995)" AUTO)
mark_as_advanced(MDBX_LOCKING)
add_mdbx_option(MDBX_TRUST_RTC "Does a system have battery-backed Real-Time Clock or just a fake" AUTO)
mark_as_advanced(MDBX_TRUST_RTC)
option(MDBX_FORCE_ASSERTIONS "Force enable assertion checking" OFF)

if(NOT MDBX_AMALGAMATED_SOURCE)
  add_mdbx_option(MDBX_ALLOY_BUILD "Build MDBX library through single/alloyed object file" ON)
endif()

if((MDBX_BUILD_TOOLS OR MDBX_ENABLE_TESTS) AND MDBX_BUILD_SHARED_LIBRARY)
  add_mdbx_option(MDBX_LINK_TOOLS_NONSTATIC "Link MDBX tools with non-static libmdbx" OFF)
else()
  unset(MDBX_LINK_TOOLS_NONSTATIC CACHE)
endif()

if(CMAKE_CXX_COMPILER_LOADED AND MDBX_CXX_STANDARD GREATER_EQUAL 11 AND MDBX_CXX_STANDARD LESS 83)
  if(NOT MDBX_AMALGAMATED_SOURCE)
    option(MDBX_ENABLE_TESTS "Build MDBX tests" ${BUILD_TESTING})
  endif()
  if(NOT MDBX_AVOID_CRT
      AND NOT (CMAKE_COMPILER_IS_GNUCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.8)
      AND NOT (CMAKE_COMPILER_IS_CLANG AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4)
      AND NOT (MSVC AND MSVC_VERSION LESS 1900))
    option(MDBX_BUILD_CXX "Build C++ portion" ON)
  else()
    set(MDBX_BUILD_CXX FALSE)
  endif()
else()
  set(MDBX_BUILD_CXX FALSE)
  set(MDBX_ENABLE_TESTS FALSE)
endif()

################################################################################
################################################################################

if(MDBX_BUILD_CXX AND NOT CMAKE_CXX_COMPILER_LOADED)
  message(FATAL_ERROR "MDBX_BUILD_CXX=${MDBX_BUILD_CXX}: The C++ compiler is required to build the C++API.")
endif()

# Get version
fetch_version(MDBX "${CMAKE_CURRENT_SOURCE_DIR}" FALSE)
message(STATUS "libmdbx version is ${MDBX_VERSION}")

# sources list
set(LIBMDBX_PUBLIC_HEADERS mdbx.h)
set(LIBMDBX_SOURCES mdbx.h "${CMAKE_CURRENT_BINARY_DIR}/config.h")
if(MDBX_AMALGAMATED_SOURCE)
  list(APPEND LIBMDBX_SOURCES mdbx.c)
else()
  # generate version file
  configure_file("${MDBX_SOURCE_DIR}/version.c.in"
    "${CMAKE_CURRENT_BINARY_DIR}/version.c" ESCAPE_QUOTES)
  file(SHA256 "${CMAKE_CURRENT_BINARY_DIR}/version.c" MDBX_SOURCERY_DIGEST)
  string(MAKE_C_IDENTIFIER "${MDBX_GIT_DESCRIBE}" MDBX_SOURCERY_SUFFIX)
  set(MDBX_BUILD_SOURCERY "${MDBX_SOURCERY_DIGEST}_${MDBX_SOURCERY_SUFFIX}")

  if(MDBX_ALLOY_BUILD)
    list(APPEND LIBMDBX_SOURCES "${MDBX_SOURCE_DIR}/alloy.c")
    include_directories("${MDBX_SOURCE_DIR}" "${CMAKE_CURRENT_BINARY_DIR}")
  else()
    list(APPEND LIBMDBX_SOURCES
      "${CMAKE_CURRENT_BINARY_DIR}/version.c"
      "${MDBX_SOURCE_DIR}/options.h" "${MDBX_SOURCE_DIR}/defs.h"
      "${MDBX_SOURCE_DIR}/internals.h" "${MDBX_SOURCE_DIR}/osal.h"
      "${MDBX_SOURCE_DIR}/core.c" "${MDBX_SOURCE_DIR}/osal.c"
      "${MDBX_SOURCE_DIR}/lck-posix.c" "${MDBX_SOURCE_DIR}/lck-windows.c")
    include_directories("${MDBX_SOURCE_DIR}")
  endif()
endif(MDBX_AMALGAMATED_SOURCE)
if(MDBX_BUILD_CXX)
  message(STATUS "Use C${MDBX_C_STANDARD} and C++${MDBX_CXX_STANDARD} for libmdbx")
  list(APPEND LIBMDBX_PUBLIC_HEADERS mdbx.h++)
  list(APPEND LIBMDBX_SOURCES "${MDBX_SOURCE_DIR}/mdbx.c++" mdbx.h++)
else()
  message(STATUS "Use C${MDBX_C_STANDARD} for libmdbx but C++ portion is disabled")
endif()

macro(target_setup_options TARGET)
  if(DEFINED INTERPROCEDURAL_OPTIMIZATION)
    set_target_properties(${TARGET} PROPERTIES
      INTERPROCEDURAL_OPTIMIZATION $<BOOL:${INTERPROCEDURAL_OPTIMIZATION}>)
  endif()
  set_target_properties(${TARGET} PROPERTIES
    C_STANDARD ${MDBX_C_STANDARD} C_STANDARD_REQUIRED ON)
  if(MDBX_BUILD_CXX)
    set_target_properties(${TARGET} PROPERTIES
      CXX_STANDARD ${MDBX_CXX_STANDARD} CXX_STANDARD_REQUIRED ON)
  endif()
  if(CC_HAS_FASTMATH)
    target_compile_options(${TARGET} PRIVATE "-ffast-math")
  endif()
  if(CC_HAS_VISIBILITY)
    target_compile_options(${TARGET} PRIVATE "-fvisibility=hidden")
  endif()
  if(BUILD_FOR_NATIVE_CPU AND CC_HAS_ARCH_NATIVE)
    target_compile_options(${TARGET} PUBLIC "-march=native")
  endif()
endmacro()

macro(libmdbx_setup_libs TARGET MODE)
  target_link_libraries(${TARGET} ${MODE} Threads::Threads)
  if(${CMAKE_SYSTEM_NAME} STREQUAL "Windows")
    target_link_libraries(${TARGET} ${MODE} ntdll.lib)
    if(MDBX_NTDLL_EXTRA_IMPLIB AND MDBX_AVOID_CRT)
      target_link_libraries(${TARGET} ${MODE} ntdll_extra)
    endif()
  elseif(${CMAKE_SYSTEM_NAME} STREQUAL "SunOS" OR ${CMAKE_SYSTEM_NAME} STREQUAL "Solaris")
    target_link_libraries(${TARGET} ${MODE} kstat)
  elseif(${CMAKE_SYSTEM_NAME} STREQUAL "Android")
    target_link_libraries(${TARGET} ${MODE} log)
  endif()
  if(LIBCXX_FILESYSTEM AND MDBX_BUILD_CXX)
    target_link_libraries(${TARGET} ${MODE} ${LIBCXX_FILESYSTEM})
  endif()
endmacro()

# build static library
if(MDBX_INSTALL_STATIC)
  add_library(mdbx-static STATIC ${LIBMDBX_SOURCES})
else()
  add_library(mdbx-static STATIC EXCLUDE_FROM_ALL ${LIBMDBX_SOURCES})
endif()
set_target_properties(mdbx-static PROPERTIES PUBLIC_HEADER "${LIBMDBX_PUBLIC_HEADERS}")
target_compile_definitions(mdbx-static PRIVATE MDBX_BUILD_SHARED_LIBRARY=0)
target_setup_options(mdbx-static)
libmdbx_setup_libs(mdbx-static INTERFACE)
if(MDBX_BUILD_SHARED_LIBRARY)
  set_target_properties(mdbx-static PROPERTIES OUTPUT_NAME mdbx-static)
else()
  set_target_properties(mdbx-static PROPERTIES OUTPUT_NAME mdbx)
endif()

################################################################################

# build shared library
if(MDBX_BUILD_SHARED_LIBRARY)
  add_library(mdbx SHARED ${LIBMDBX_SOURCES})
  set_target_properties(mdbx PROPERTIES PUBLIC_HEADER "${LIBMDBX_PUBLIC_HEADERS}")
  target_compile_definitions(mdbx PRIVATE LIBMDBX_EXPORTS MDBX_BUILD_SHARED_LIBRARY=1 INTERFACE LIBMDBX_IMPORTS)
  target_setup_options(mdbx)
  libmdbx_setup_libs(mdbx PRIVATE)
  if(MSVC)
    if(MDBX_NTDLL_EXTRA_IMPLIB AND MDBX_AVOID_CRT)
      set_property(TARGET mdbx PROPERTY LINKER_FLAGS "/NODEFAULTLIB")
    else()
      set_property(TARGET mdbx PROPERTY MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>DLL")
    endif()
  endif()
  if(CC_HAS_VISIBILITY AND (LTO_ENABLED OR INTERPROCEDURAL_OPTIMIZATION))
    set_target_properties(mdbx PROPERTIES LINK_FLAGS "-fvisibility=hidden")
  endif()
  list(APPEND MDBX_BUILD_FLAGS ${CMAKE_SHARED_LINKER_FLAGS})
endif()

if(MDBX_BUILD_SHARED_LIBRARY AND MDBX_LINK_TOOLS_NONSTATIC)
  set(TOOL_MDBX_LIB mdbx)

  # use, i.e. don't skip the full RPATH for the build tree
  set(CMAKE_SKIP_BUILD_RPATH FALSE)

  # when building, don't use the install RPATH already (but later on when installing)
  set(CMAKE_BUILD_WITH_INSTALL_RPATH FALSE)

  # add the automatically determined parts of the RPATH
  # which point to directories outside the build tree to the install RPATH
  set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)

  # the RPATH to be used when installing, but only if it's not a system directory
  list(FIND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES "${CMAKE_INSTALL_PREFIX}/lib" isSystemDir)
  if(isSystemDir EQUAL -1)
    if(${CMAKE_SYSTEM_NAME} STREQUAL "Darwin")
      set(CMAKE_INSTALL_RPATH "@executable_path/../lib")
    else()
      set(CMAKE_INSTALL_RPATH "\$ORIGIN/../lib")
    endif()
  endif()
else()
  set(TOOL_MDBX_LIB mdbx-static)
endif()

# build mdbx-tools
if(MDBX_BUILD_TOOLS)
  if(NOT MDBX_AMALGAMATED_SOURCE AND ${CMAKE_SYSTEM_NAME} STREQUAL "Windows")
    set(WINGETOPT_SRC ${MDBX_SOURCE_DIR}/wingetopt.c ${MDBX_SOURCE_DIR}/wingetopt.h)
  else()
    set(WINGETOPT_SRC "")
  endif()

  foreach(TOOL mdbx_chk mdbx_copy mdbx_stat mdbx_dump mdbx_load)
    add_executable(${TOOL} mdbx.h ${MDBX_SOURCE_DIR}/${TOOL}.c ${WINGETOPT_SRC})
    if(MDBX_C_STANDARD)
      set_target_properties(${TOOL} PROPERTIES
        C_STANDARD ${MDBX_C_STANDARD} C_STANDARD_REQUIRED ON)
    endif()
    target_setup_options(${TOOL})
    target_link_libraries(${TOOL} ${TOOL_MDBX_LIB})
  endforeach()
  if(LIB_MATH)
    target_link_libraries(mdbx_chk ${LIB_MATH})
    target_link_libraries(mdbx_stat ${LIB_MATH})
  endif()
endif()

################################################################################

# mdbx-shared-lib installation
if(NOT DEFINED MDBX_DLL_INSTALL_DESTINATION)
  if(WIN32)
    set(MDBX_DLL_INSTALL_DESTINATION bin)
  else()
    set(MDBX_DLL_INSTALL_DESTINATION lib)
  endif()
endif()
if(MDBX_BUILD_SHARED_LIBRARY)
  if(CMAKE_VERSION VERSION_LESS 3.12)
    install(TARGETS mdbx EXPORT libmdbx
      LIBRARY DESTINATION ${MDBX_DLL_INSTALL_DESTINATION} COMPONENT runtime
      OBJECTS DESTINATION lib COMPONENT devel
      ARCHIVE DESTINATION lib COMPONENT devel
      PUBLIC_HEADER DESTINATION include COMPONENT devel
      INCLUDES DESTINATION include COMPONENT devel)
  else()
    install(TARGETS mdbx EXPORT libmdbx
      LIBRARY DESTINATION ${MDBX_DLL_INSTALL_DESTINATION} COMPONENT runtime
      NAMELINK_COMPONENT devel
      OBJECTS DESTINATION lib COMPONENT devel
      ARCHIVE DESTINATION lib COMPONENT devel
      PUBLIC_HEADER DESTINATION include COMPONENT devel
      INCLUDES DESTINATION include COMPONENT devel)
  endif()
endif(MDBX_BUILD_SHARED_LIBRARY)

# mdbx-tools installation
if(MDBX_BUILD_TOOLS)
  if(NOT DEFINED MDBX_TOOLS_INSTALL_DESTINATION)
    set(MDBX_TOOLS_INSTALL_DESTINATION bin)
  endif()
  install(
    TARGETS
    mdbx_chk
    mdbx_stat
    mdbx_copy
    mdbx_dump
    mdbx_load
    RUNTIME
    DESTINATION ${MDBX_TOOLS_INSTALL_DESTINATION}
    COMPONENT runtime)
  if(MDBX_INSTALL_MANPAGES)
    if(NOT DEFINED MDBX_MAN_INSTALL_DESTINATION)
      set(MDBX_MAN_INSTALL_DESTINATION man/man1)
    endif()
    install(
      FILES
      "${MDBX_SOURCE_DIR}/man1/mdbx_chk.1"
      "${MDBX_SOURCE_DIR}/man1/mdbx_stat.1"
      "${MDBX_SOURCE_DIR}/man1/mdbx_copy.1"
      "${MDBX_SOURCE_DIR}/man1/mdbx_dump.1"
      "${MDBX_SOURCE_DIR}/man1/mdbx_load.1"
      DESTINATION ${MDBX_MAN_INSTALL_DESTINATION}
      COMPONENT doc)
  endif()
endif(MDBX_BUILD_TOOLS)

# mdbx-static-lib installation
if(MDBX_INSTALL_STATIC)
  if(CMAKE_VERSION VERSION_LESS 3.12)
    install(TARGETS mdbx-static EXPORT libmdbx
      LIBRARY DESTINATION lib COMPONENT devel
      OBJECTS DESTINATION lib COMPONENT devel
      ARCHIVE DESTINATION lib COMPONENT devel
      PUBLIC_HEADER DESTINATION include COMPONENT devel
      INCLUDES DESTINATION include COMPONENT devel)
  else()
    install(TARGETS mdbx-static EXPORT libmdbx
      LIBRARY DESTINATION lib COMPONENT devel
      NAMELINK_COMPONENT devel
      OBJECTS DESTINATION lib COMPONENT devel
      ARCHIVE DESTINATION lib COMPONENT devel
      PUBLIC_HEADER DESTINATION include COMPONENT devel
      INCLUDES DESTINATION include COMPONENT devel)
  endif()
endif(MDBX_INSTALL_STATIC)

################################################################################

# collect options & build info
string(TIMESTAMP MDBX_BUILD_TIMESTAMP UTC)
set(MDBX_BUILD_FLAGS ${CMAKE_C_FLAGS})
if(MDBX_BUILD_CXX)
  set(MDBX_BUILD_FLAGS ${CMAKE_CXX_FLAGS})
endif()

# append cmake's build-type flags and defines
if(NOT CMAKE_CONFIGURATION_TYPES)
  list(APPEND MDBX_BUILD_FLAGS ${CMAKE_C_FLAGS_${CMAKE_BUILD_TYPE_UPPERCASE}})
  if(MDBX_BUILD_CXX)
    list(APPEND MDBX_BUILD_FLAGS ${CMAKE_CXX_FLAGS_${CMAKE_BUILD_TYPE_UPPERCASE}})
  endif()
endif()

# choice target to fetch definitions and options
if(MDBX_BUILD_SHARED_LIBRARY)
  set(target4fetch mdbx)
else()
  set(target4fetch mdbx-static)
endif()

# get definitions
get_target_property(defs_list ${target4fetch} COMPILE_DEFINITIONS)
if(defs_list)
  list(APPEND MDBX_BUILD_FLAGS ${defs_list})
endif()

# get target compile options
get_target_property(options_list ${target4fetch} COMPILE_OPTIONS)
if(options_list)
  list(APPEND MDBX_BUILD_FLAGS ${options_list})
endif()

list(REMOVE_DUPLICATES MDBX_BUILD_FLAGS)
string(REPLACE ";" " " MDBX_BUILD_FLAGS "${MDBX_BUILD_FLAGS}")
if(CMAKE_CONFIGURATION_TYPES)
  # add dynamic part via per-configuration define
  message(STATUS "MDBX Compile Flags: ${MDBX_BUILD_FLAGS} <AND CONFIGURATION DEPENDENT>")
  add_definitions(-DMDBX_BUILD_FLAGS_CONFIG="$<$<CONFIG:Debug>:${CMAKE_C_FLAGS_DEBUG} ${CMAKE_C_DEFINES_DEBUG}>$<$<CONFIG:Release>:${CMAKE_C_FLAGS_RELEASE} ${CMAKE_C_DEFINES_RELEASE}>$<$<CONFIG:RelWithDebInfo>:${CMAKE_C_FLAGS_RELWITHDEBINFO} ${CMAKE_C_DEFINES_RELWITHDEBINFO}>$<$<CONFIG:MinSizeRel>:${CMAKE_C_FLAGS_MINSIZEREL} ${CMAKE_C_DEFINES_MINSIZEREL}>")
else()
  message(STATUS "MDBX Compile Flags: ${MDBX_BUILD_FLAGS}")
endif()

# get compiler info
execute_process(COMMAND sh -c "${CMAKE_C_COMPILER} --version | head -1"
  OUTPUT_VARIABLE MDBX_BUILD_COMPILER
  OUTPUT_STRIP_TRAILING_WHITESPACE
  ERROR_QUIET
  RESULT_VARIABLE rc)
if(rc OR NOT MDBX_BUILD_COMPILER)
  string(STRIP "${CMAKE_C_COMPILER_ID}-${CMAKE_C_COMPILER_VERSION}" MDBX_BUILD_COMPILER)
endif()

# make a build-target triplet
if(CMAKE_C_COMPILER_TARGET)
  set(MDBX_BUILD_TARGET "${CMAKE_C_COMPILER_TARGET}")
elseif(CMAKE_C_PLATFORM_ID AND NOT CMAKE_C_PLATFORM_ID STREQUAL CMAKE_SYSTEM_NAME)
  string(STRIP "${CMAKE_C_PLATFORM_ID}-${CMAKE_SYSTEM_NAME}" MDBX_BUILD_TARGET)
elseif(CMAKE_LIBRARY_ARCHITECTURE)
  string(STRIP "${CMAKE_LIBRARY_ARCHITECTURE}-${CMAKE_SYSTEM_NAME}" MDBX_BUILD_TARGET)
elseif(CMAKE_GENERATOR_PLATFORM AND NOT CMAKE_C_PLATFORM_ID STREQUAL CMAKE_SYSTEM_NAME)
  string(STRIP "${CMAKE_GENERATOR_PLATFORM}-${CMAKE_SYSTEM_NAME}" MDBX_BUILD_TARGET)
elseif(CMAKE_SYSTEM_ARCH)
  string(STRIP "${CMAKE_SYSTEM_ARCH}-${CMAKE_SYSTEM_NAME}" MDBX_BUILD_TARGET)
else()
  string(STRIP "${CMAKE_SYSTEM_PROCESSOR}-${CMAKE_SYSTEM_NAME}" MDBX_BUILD_TARGET)
endif()

# provide build-type
if(CMAKE_CONFIGURATION_TYPES)
  # via per-configuration define
  add_definitions(-DMDBX_BUILD_TYPE="$<CONFIG>")
  set(MDBX_BUILD_TYPE "<CONFIGURATION DEPENDENT>")
else()
  set(MDBX_BUILD_TYPE ${CMAKE_BUILD_TYPE})
endif()

# options
set(options VERSION C_COMPILER CXX_COMPILER MDBX_BUILD_TARGET MDBX_BUILD_TYPE)
foreach(item IN LISTS options)
  if(DEFINED ${item})
    set(value "${${item}}")
  elseif(DEFINED MDBX_${item})
    set(item MDBX_${item})
    set(value "${${item}}")
  elseif(DEFINED CMAKE_${item})
    set(item CMAKE_${item})
    set(value "${${item}}")
  else()
    set(value "undefined")
  endif()
  message(STATUS "${item}: ${value}")
endforeach(item)

# provide config.h for library build info
configure_file("${MDBX_SOURCE_DIR}/config.h.in"
  "${CMAKE_CURRENT_BINARY_DIR}/config.h" ESCAPE_QUOTES)
add_definitions(-DMDBX_CONFIG_H="${CMAKE_CURRENT_BINARY_DIR}/config.h")

################################################################################

if(NOT MDBX_AMALGAMATED_SOURCE AND MDBX_ENABLE_TESTS)
  if(NOT CMAKE_CXX_COMPILER_LOADED)
    message(FATAL_ERROR "MDBX_ENABLE_TESTS=${MDBX_ENABLE_TESTS}: The C++ compiler is required to build the tests.")
  endif()
  add_subdirectory(test)
endif()

################################################################################

set(PACKAGE "libmdbx")
set(CPACK_PACKAGE_VERSION_MAJOR ${MDBX_VERSION_MAJOR})
set(CPACK_PACKAGE_VERSION_MINOR ${MDBX_VERSION_MINOR})
set(CPACK_PACKAGE_VERSION_PATCH ${MDBX_VERSION_RELEASE})
set(CPACK_PACKAGE_VERSION_COMMIT ${MDBX_VERSION_REVISION})
set(PACKAGE_VERSION "${CPACK_PACKAGE_VERSION_MAJOR}.${CPACK_PACKAGE_VERSION_MINOR}.${CPACK_PACKAGE_VERSION_PATCH}.${CPACK_PACKAGE_VERSION_COMMIT}")
message(STATUS "libmdbx package version is ${PACKAGE_VERSION}")

cmake_policy(POP)