libmdbx: upgrade to 0.4.0

1 files changed, 666 insertions, 0 deletions

diff --git a/libs/libmdbx/src/cmake/compiler.cmake b/libs/libmdbx/src/cmake/compiler.cmake
new file mode 100644
index 0000000000..03b0805bec
--- /dev/null
+++ b/libs/libmdbx/src/cmake/compiler.cmake
@@ -0,0 +1,666 @@
+##  Copyright (c) 2012-2019 Leonid Yuriev <leo@yuriev.ru>.
+##
+##  Licensed under the Apache License, Version 2.0 (the "License");
+##  you may not use this file except in compliance with the License.
+##  You may obtain a copy of the License at
+##
+##      http://www.apache.org/licenses/LICENSE-2.0
+##
+##  Unless required by applicable law or agreed to in writing, software
+##  distributed under the License is distributed on an "AS IS" BASIS,
+##  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+##  See the License for the specific language governing permissions and
+##  limitations under the License.
+##
+
+cmake_minimum_required(VERSION 3.8.2)
+cmake_policy(PUSH)
+cmake_policy(VERSION 3.8.2)
+
+if (CMAKE_VERSION MATCHES ".*MSVC.*")
+  message(FATAL_ERROR "CMake from MSVC kit is unfit! "
+    "Please use the original CMake from https://cmake.org/download/")
+endif()
+
+if (NOT (CMAKE_C_COMPILER_LOADED OR CMAKE_CXX_COMPILER_LOADED))
+  message(FATAL_ERROR "This module required C or C++ to be enabled")
+endif()
+
+include(CMakeDependentOption)
+
+if(CMAKE_CXX_COMPILER_LOADED)
+  include(CheckCXXSourceRuns)
+  include(CheckCXXSourceCompiles)
+  include(CheckCXXCompilerFlag)
+endif()
+if(CMAKE_C_COMPILER_LOADED)
+  include(CheckCSourceRuns)
+  include(CheckCSourceCompiles)
+  include(CheckCCompilerFlag)
+endif()
+
+# Check if the same compile family is used for both C and CXX
+if(CMAKE_C_COMPILER_LOADED AND CMAKE_CXX_COMPILER_LOADED AND
+    NOT (CMAKE_C_COMPILER_ID STREQUAL CMAKE_CXX_COMPILER_ID))
+  message(WARNING "CMAKE_C_COMPILER_ID (${CMAKE_C_COMPILER_ID}) is different "
+    "from CMAKE_CXX_COMPILER_ID (${CMAKE_CXX_COMPILER_ID}). "
+    "The final binary may be unusable.")
+endif()
+
+if(CMAKE_CXX_COMPILER_LOADED)
+  set(CMAKE_PRIMARY_LANG "CXX")
+else()
+  set(CMAKE_PRIMARY_LANG "C")
+endif()
+
+macro(check_compiler_flag flag variable)
+  if(CMAKE_CXX_COMPILER_LOADED)
+    check_cxx_compiler_flag(${flag} ${variable})
+  else()
+    check_c_compiler_flag(${flag} ${variable})
+  endif()
+endmacro(check_compiler_flag)
+
+# We support building with Clang and gcc. First check
+# what we're using for build.
+if(CMAKE_C_COMPILER_LOADED AND CMAKE_C_COMPILER_ID STREQUAL "Clang")
+  set(CMAKE_COMPILER_IS_CLANG  ON)
+  set(CMAKE_COMPILER_IS_GNUCC  OFF)
+endif()
+if(CMAKE_CXX_COMPILER_LOADED AND CMAKE_CXx_COMPILER_ID STREQUAL "Clang")
+  set(CMAKE_COMPILER_IS_CLANG  ON)
+  set(CMAKE_COMPILER_IS_GNUCXX OFF)
+endif()
+
+# Hard coding the compiler version is ugly from cmake POV, but
+# at least gives user a friendly error message. The most critical
+# demand for C++ compiler is support of C++11 lambdas, added
+# only in version 4.5 https://gcc.gnu.org/projects/cxx0x.html
+if(CMAKE_COMPILER_IS_GNUCC)
+  if(CMAKE_C_COMPILER_VERSION VERSION_LESS 4.5)
+    message(FATAL_ERROR "
+      Your GCC version is ${CMAKE_C_COMPILER_VERSION}, please update")
+  endif()
+endif()
+if(CMAKE_COMPILER_IS_GNUCXX)
+  if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.5)
+    message(FATAL_ERROR "
+      Your G++ version is ${CMAKE_CXX_COMPILER_VERSION}, please update")
+  endif()
+endif()
+
+if(CMAKE_C_COMPILER_LOADED)
+  # Check for Elbrus lcc
+  execute_process(COMMAND ${CMAKE_C_COMPILER} --version
+    OUTPUT_VARIABLE tmp_lcc_probe_version
+    RESULT_VARIABLE tmp_lcc_probe_result ERROR_QUIET)
+  if(tmp_lcc_probe_result EQUAL 0)
+    string(FIND "${tmp_lcc_probe_version}" "lcc:" tmp_lcc_marker)
+    string(FIND "${tmp_lcc_probe_version}" ":e2k-" tmp_e2k_marker)
+    if(tmp_lcc_marker GREATER -1 AND tmp_e2k_marker GREATER tmp_lcc_marker)
+      execute_process(COMMAND ${CMAKE_C_COMPILER} -print-version
+        OUTPUT_VARIABLE CMAKE_C_COMPILER_VERSION
+        RESULT_VARIABLE tmp_lcc_probe_result)
+      set(CMAKE_COMPILER_IS_ELBRUSC ON)
+      set(CMAKE_C_COMPILER_ID "Elbrus")
+    else()
+      set(CMAKE_COMPILER_IS_ELBRUSC OFF)
+    endif()
+    unset(tmp_lcc_marker)
+    unset(tmp_e2k_marker)
+  endif()
+  unset(tmp_lcc_probe_version)
+  unset(tmp_lcc_probe_result)
+endif()
+
+if(CMAKE_CXX_COMPILER_LOADED)
+  # Check for Elbrus l++
+  execute_process(COMMAND ${CMAKE_CXX_COMPILER} --version
+    OUTPUT_VARIABLE tmp_lxx_probe_version
+    RESULT_VARIABLE tmp_lxx_probe_result ERROR_QUIET)
+  if(tmp_lxx_probe_result EQUAL 0)
+    string(FIND "${tmp_lxx_probe_version}" "lcc:" tmp_lcc_marker)
+    string(FIND "${tmp_lxx_probe_version}" ":e2k-" tmp_e2k_marker)
+    if(tmp_lcc_marker GREATER -1 AND tmp_e2k_marker GREATER tmp_lcc_marker)
+      execute_process(COMMAND ${CMAKE_CXX_COMPILER} -print-version
+        OUTPUT_VARIABLE CMAKE_CXX_COMPILER_VERSION
+        RESULT_VARIABLE tmp_lxx_probe_result)
+      set(CMAKE_COMPILER_IS_ELBRUSCXX ON)
+      set(CMAKE_CXX_COMPILER_ID "Elbrus")
+    else()
+      set(CMAKE_COMPILER_IS_ELBRUSCXX OFF)
+    endif()
+    unset(tmp_lcc_marker)
+    unset(tmp_e2k_marker)
+  endif()
+  unset(tmp_lxx_probe_version)
+  unset(tmp_lxx_probe_result)
+endif()
+
+if(CMAKE_CL_64)
+  set(MSVC64 1)
+endif()
+if(WIN32 AND CMAKE_COMPILER_IS_GNU${CMAKE_PRIMARY_LANG})
+  execute_process(COMMAND ${CMAKE_${CMAKE_PRIMARY_LANG}_COMPILER} -dumpmachine
+    OUTPUT_VARIABLE __GCC_TARGET_MACHINE
+    OUTPUT_STRIP_TRAILING_WHITESPACE)
+  if(__GCC_TARGET_MACHINE MATCHES "amd64|x86_64|AMD64")
+    set(MINGW64 1)
+  endif()
+  unset(__GCC_TARGET_MACHINE)
+endif()
+
+if(CMAKE_COMPILER_IS_ELBRUSC OR CMAKE_SYSTEM_PROCESSOR MATCHES "e2k.*|E2K.*|elbrus.*|ELBRUS.*")
+  set(E2K TRUE)
+  set(CMAKE_SYSTEM_ARCH "Elbrus")
+elseif((MSVC64 OR MINGW64) AND CMAKE_SIZEOF_VOID_P EQUAL 8)
+  set(X86_64 TRUE)
+  set(CMAKE_SYSTEM_ARCH "x86_64")
+elseif(MINGW OR (MSVC AND NOT CMAKE_CROSSCOMPILING))
+  set(X86_32 TRUE)
+  set(CMAKE_SYSTEM_ARCH "x86")
+elseif(CMAKE_COMPILER_IS_ELBRUSC OR CMAKE_SYSTEM_PROCESSOR MATCHES "e2k.*|E2K.*|elbrus.*|ELBRUS.*")
+  set(E2K TRUE)
+  set(CMAKE_SYSTEM_ARCH "Elbrus")
+elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "amd64.*|x86_64.*|AMD64.*" AND CMAKE_SIZEOF_VOID_P EQUAL 8)
+  set(X86_64 TRUE)
+  set(CMAKE_SYSTEM_ARCH "x86_64")
+elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "i686.*|i386.*|x86.*")
+  set(X86_32 TRUE)
+  set(CMAKE_SYSTEM_ARCH "x86")
+elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64.*|AARCH64.*|ARM64.*)" AND CMAKE_SIZEOF_VOID_P EQUAL 8)
+  set(AARCH64 TRUE)
+  set(CMAKE_SYSTEM_ARCH "ARM64")
+elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(arm.*|ARM.*)")
+  set(ARM32 TRUE)
+  set(CMAKE_SYSTEM_ARCH "ARM")
+elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(powerpc|ppc)64le.*" AND CMAKE_SIZEOF_VOID_P EQUAL 8)
+  set(PPC64LE TRUE)
+  set(CMAKE_SYSTEM_ARCH "PPC64LE")
+elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(powerpc|ppc)64.*" AND CMAKE_SIZEOF_VOID_P EQUAL 8)
+  set(PPC64 TRUE)
+  set(CMAKE_SYSTEM_ARCH "PPC64")
+elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(powerpc|ppc).*")
+  set(PPC32 TRUE)
+  set(CMAKE_SYSTEM_ARCH "PPC")
+elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(mips|MIPS)64.*" AND CMAKE_SIZEOF_VOID_P EQUAL 8)
+  set(MIPS64 TRUE)
+  set(CMAKE_SYSTEM_ARCH "MIPS64")
+elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(mips|MIPS).*")
+  set(MIPS32 TRUE)
+  set(CMAKE_SYSTEM_ARCH "MIPS")
+endif()
+
+if(MSVC)
+  check_compiler_flag("/WX" CC_HAS_WERROR)
+else()
+  #
+  # GCC started to warn for unused result starting from 4.2, and
+  # this is when it introduced -Wno-unused-result
+  # GCC can also be built on top of llvm runtime (on mac).
+  check_compiler_flag("-Wno-unknown-pragmas" CC_HAS_WNO_UNKNOWN_PRAGMAS)
+  check_compiler_flag("-Wextra" CC_HAS_WEXTRA)
+  check_compiler_flag("-Werror" CC_HAS_WERROR)
+  check_compiler_flag("-fexceptions" CC_HAS_FEXCEPTIONS)
+  check_cxx_compiler_flag("-fcxx-exceptions" CC_HAS_FCXX_EXCEPTIONS)
+  check_compiler_flag("-funwind-tables" CC_HAS_FUNWIND_TABLES)
+  check_compiler_flag("-fno-omit-frame-pointer" CC_HAS_FNO_OMIT_FRAME_POINTER)
+  check_compiler_flag("-fno-common" CC_HAS_FNO_COMMON)
+  check_compiler_flag("-ggdb" CC_HAS_GGDB)
+  check_compiler_flag("-fvisibility=hidden" CC_HAS_VISIBILITY)
+  check_compiler_flag("-march=native" CC_HAS_ARCH_NATIVE)
+  check_compiler_flag("-Og" CC_HAS_DEBUG_FRENDLY_OPTIMIZATION)
+  check_compiler_flag("-Wall" CC_HAS_WALL)
+  check_compiler_flag("-Ominimal" CC_HAS_OMINIMAL)
+  check_compiler_flag("-ffunction-sections -fdata-sections" CC_HAS_SECTIONS)
+  check_compiler_flag("-ffast-math" CC_HAS_FASTMATH)
+
+  # Check for an omp support
+  set(CMAKE_REQUIRED_FLAGS "-fopenmp -Werror")
+  check_cxx_source_compiles("int main(void) {
+    #pragma omp parallel
+    return 0;
+    }" HAVE_OPENMP)
+  set(CMAKE_REQUIRED_FLAGS "")
+endif()
+
+# Check for LTO support by GCC
+if(CMAKE_COMPILER_IS_GNU${CMAKE_PRIMARY_LANG})
+  unset(gcc_collect)
+  unset(gcc_lto_wrapper)
+
+  if(NOT CMAKE_${CMAKE_PRIMARY_LANG}_COMPILER_VERSION VERSION_LESS 4.7)
+    execute_process(COMMAND ${CMAKE_${CMAKE_PRIMARY_LANG}_COMPILER} -v
+      OUTPUT_VARIABLE gcc_info_v ERROR_VARIABLE gcc_info_v)
+
+    string(REGEX MATCH "^(.+\nCOLLECT_GCC=)([^ \n]+)(\n.+)$" gcc_collect_valid ${gcc_info_v})
+    if(gcc_collect_valid)
+      string(REGEX REPLACE "^(.+\nCOLLECT_GCC=)([^ \n]+)(\n.+)$" "\\2" gcc_collect ${gcc_info_v})
+    endif()
+
+    string(REGEX MATCH "^(.+\nCOLLECT_LTO_WRAPPER=)([^ \n]+/lto-wrapper)(\n.+)$" gcc_lto_wrapper_valid ${gcc_info_v})
+    if(gcc_lto_wrapper_valid)
+      string(REGEX REPLACE "^(.+\nCOLLECT_LTO_WRAPPER=)([^ \n]+/lto-wrapper)(\n.+)$" "\\2" gcc_lto_wrapper ${gcc_info_v})
+    endif()
+
+    set(gcc_suffix "")
+    if(gcc_collect_valid AND gcc_collect)
+      string(REGEX MATCH "^(.*cc)(-.+)$" gcc_suffix_valid ${gcc_collect})
+      if(gcc_suffix_valid)
+        string(REGEX MATCH "^(.*cc)(-.+)$" "\\2" gcc_suffix ${gcc_collect})
+      endif()
+    endif()
+
+    get_filename_component(gcc_dir ${CMAKE_${CMAKE_PRIMARY_LANG}_COMPILER} DIRECTORY)
+    if(NOT CMAKE_GCC_AR)
+      find_program(CMAKE_GCC_AR NAMES gcc${gcc_suffix}-ar gcc-ar${gcc_suffix} PATHS ${gcc_dir} NO_DEFAULT_PATH)
+    endif()
+    if(NOT CMAKE_GCC_NM)
+      find_program(CMAKE_GCC_NM NAMES gcc${gcc_suffix}-nm gcc-nm${gcc_suffix} PATHS ${gcc_dir} NO_DEFAULT_PATH)
+    endif()
+    if(NOT CMAKE_GCC_RANLIB)
+      find_program(CMAKE_GCC_RANLIB NAMES gcc${gcc_suffix}-ranlib gcc-ranlib${gcc_suffix} PATHS ${gcc_dir} NO_DEFAULT_PATH)
+    endif()
+
+    unset(gcc_dir)
+    unset(gcc_suffix_valid)
+    unset(gcc_suffix)
+    unset(gcc_lto_wrapper_valid)
+    unset(gcc_collect_valid)
+    unset(gcc_collect)
+    unset(gcc_info_v)
+  endif()
+
+  if(CMAKE_GCC_AR AND CMAKE_GCC_NM AND CMAKE_GCC_RANLIB AND gcc_lto_wrapper)
+    message(STATUS "Found GCC's LTO toolset: ${gcc_lto_wrapper}, ${CMAKE_GCC_AR}, ${CMAKE_GCC_RANLIB}")
+    set(GCC_LTO_CFLAGS "-flto -fno-fat-lto-objects -fuse-linker-plugin")
+    set(GCC_LTO_AVAILABLE TRUE)
+    message(STATUS "Link-Time Optimization by GCC is available")
+  else()
+    set(GCC_LTO_AVAILABLE FALSE)
+    message(STATUS "Link-Time Optimization by GCC is NOT available")
+  endif()
+  unset(gcc_lto_wrapper)
+endif()
+
+# check for LTO by MSVC
+if(MSVC)
+  if(NOT MSVC_VERSION LESS 1600)
+    set(MSVC_LTO_AVAILABLE TRUE)
+    message(STATUS "Link-Time Optimization by MSVC is available")
+  else()
+    set(MSVC_LTO_AVAILABLE FALSE)
+    message(STATUS "Link-Time Optimization by MSVC is NOT available")
+  endif()
+endif()
+
+# Check for LTO support by CLANG
+if(CMAKE_COMPILER_IS_CLANG)
+  if(NOT CMAKE_${CMAKE_PRIMARY_LANG}_COMPILER_VERSION VERSION_LESS 3.5)
+    execute_process(COMMAND ${CMAKE_${CMAKE_PRIMARY_LANG}_COMPILER} -print-search-dirs
+      OUTPUT_VARIABLE clang_search_dirs)
+
+    unset(clang_bindir)
+    unset(clang_libdir)
+    string(REGEX MATCH "^(.*programs: =)([^:]*:)*([^:]+/llvm[-.0-9]+/bin[^:]*)(:[^:]*)*(\n.+)$" clang_bindir_valid ${clang_search_dirs})
+    if(clang_bindir_valid)
+      string(REGEX REPLACE "^(.*programs: =)([^:]*:)*([^:]+/llvm[-.0-9]+/bin[^:]*)(:[^:]*)*(\n.+)$" "\\3" clang_bindir ${clang_search_dirs})
+      get_filename_component(clang_libdir "${clang_bindir}/../lib" REALPATH)
+      if(clang_libdir)
+        message(STATUS "Found CLANG/LLVM directories: ${clang_bindir}, ${clang_libdir}")
+      endif()
+    endif()
+
+    if(NOT (clang_bindir AND clang_libdir))
+      message(STATUS "Could NOT find CLANG/LLVM directories (bin and/or lib).")
+    endif()
+
+    if(NOT CMAKE_CLANG_LD AND clang_bindir)
+      find_program(CMAKE_CLANG_LD NAMES llvm-link link llvm-ld ld PATHS ${clang_bindir} NO_DEFAULT_PATH)
+    endif()
+    if(NOT CMAKE_CLANG_AR AND clang_bindir)
+      find_program(CMAKE_CLANG_AR NAMES llvm-ar ar PATHS ${clang_bindir} NO_DEFAULT_PATH)
+    endif()
+    if(NOT CMAKE_CLANG_NM AND clang_bindir)
+      find_program(CMAKE_CLANG_NM NAMES llvm-nm nm PATHS ${clang_bindir} NO_DEFAULT_PATH)
+    endif()
+    if(NOT CMAKE_CLANG_RANLIB AND clang_bindir)
+      find_program(CMAKE_CLANG_RANLIB NAMES llvm-ranlib ranlib PATHS ${clang_bindir} NO_DEFAULT_PATH)
+    endif()
+
+    set(clang_lto_plugin_name "LLVMgold${CMAKE_SHARED_LIBRARY_SUFFIX}")
+    if(NOT CMAKE_LD_GOLD AND clang_bindir)
+      find_program(CMAKE_LD_GOLD NAMES ld.gold PATHS)
+    endif()
+    if(NOT CLANG_LTO_PLUGIN AND clang_libdir)
+      find_file(CLANG_LTO_PLUGIN ${clang_lto_plugin_name} PATH ${clang_libdir} NO_DEFAULT_PATH)
+    endif()
+    if(CLANG_LTO_PLUGIN)
+      message(STATUS "Found CLANG/LLVM's plugin for LTO: ${CLANG_LTO_PLUGIN}")
+    else()
+      message(STATUS "Could NOT find CLANG/LLVM's plugin (${clang_lto_plugin_name}) for LTO.")
+    endif()
+
+    if(CMAKE_CLANG_LD AND CMAKE_CLANG_AR AND CMAKE_CLANG_NM AND CMAKE_CLANG_RANLIB)
+      message(STATUS "Found CLANG/LLVM's binutils for LTO: ${CMAKE_CLANG_AR}, ${CMAKE_CLANG_RANLIB}")
+    else()
+      message(STATUS "Could NOT find CLANG/LLVM's binutils (ar, ranlib, nm) for LTO.")
+    endif()
+
+    unset(clang_lto_plugin_name)
+    unset(clang_libdir)
+    unset(clang_bindir_valid)
+    unset(clang_bindir)
+    unset(clang_search_dirs)
+  endif()
+
+  if((CLANG_LTO_PLUGIN AND CMAKE_LD_GOLD) AND
+      (CMAKE_CLANG_LD AND CMAKE_CLANG_AR AND CMAKE_CLANG_NM AND CMAKE_CLANG_RANLIB))
+    set(CLANG_LTO_AVAILABLE TRUE)
+    message(STATUS "Link-Time Optimization by CLANG/LLVM is available")
+  elseif(CMAKE_TOOLCHAIN_FILE AND NOT CMAKE_${CMAKE_PRIMARY_LANG}_COMPILER_VERSION VERSION_LESS 7.0)
+    set(CLANG_LTO_AVAILABLE TRUE)
+    if (NOT CMAKE_CLANG_AR)
+      set(CMAKE_CLANG_AR ${CMAKE_AR})
+    endif()
+    if (NOT CMAKE_CLANG_NM)
+      set(CMAKE_CLANG_NM ${CMAKE_NM})
+    endif()
+    if (NOT CMAKE_CLANG_RANLIB)
+      set(CMAKE_CLANG_RANLIB ${CMAKE_RANLIB })
+    endif()
+    message(STATUS "Assume Link-Time Optimization by CLANG/LLVM is available via ${CMAKE_TOOLCHAIN_FILE}")
+  else()
+    set(CLANG_LTO_AVAILABLE FALSE)
+    message(STATUS "Link-Time Optimization by CLANG/LLVM is NOT available")
+  endif()
+endif()
+
+# Perform build type specific configuration.
+option(ENABLE_BACKTRACE "Enable output of fiber backtrace information in 'show
+  fiber' administrative command. Only works on x86 architectures, if compiled
+  with gcc. If GNU binutils and binutils-dev libraries are installed, backtrace
+  is output with resolved function (symbol) names. Otherwise only frame
+  addresses are printed." OFF)
+
+set(HAVE_BFD False)
+if(ENABLE_BACKTRACE)
+  if(NOT (X86_32 OR X86_64) OR NOT CMAKE_COMPILER_IS_GNU${CMAKE_PRIMARY_LANG})
+    # We only know this option to work with gcc
+    message(FATAL_ERROR "ENABLE_BACKTRACE option is set but the system
+      is not x86 based (${CMAKE_SYSTEM_PROCESSOR}) or the compiler
+      is not GNU GCC (${CMAKE_${CMAKE_PRIMARY_LANG}_COMPILER}).")
+  endif()
+  # Use GNU bfd if present.
+  find_library(BFD_LIBRARY NAMES libbfd.a)
+  if(BFD_LIBRARY)
+    check_library_exists(${BFD_LIBRARY} bfd_init "" HAVE_BFD_LIB)
+  endif()
+  find_library(IBERTY_LIBRARY NAMES libiberty.a)
+  if(IBERTY_LIBRARY)
+    check_library_exists(${IBERTY_LIBRARY} cplus_demangle "" HAVE_IBERTY_LIB)
+  endif()
+  set(CMAKE_REQUIRED_DEFINITIONS -DPACKAGE=${PACKAGE} -DPACKAGE_VERSION=${PACKAGE_VERSION})
+  check_include_files(bfd.h HAVE_BFD_H)
+  set(CMAKE_REQUIRED_DEFINITIONS)
+  find_package(ZLIB)
+  if(HAVE_BFD_LIB AND HAVE_BFD_H AND HAVE_IBERTY_LIB AND ZLIB_FOUND)
+    set(HAVE_BFD ON)
+    set(BFD_LIBRARIES ${BFD_LIBRARY} ${IBERTY_LIBRARY} ${ZLIB_LIBRARIES})
+    find_package_message(BFD_LIBRARIES "Found libbfd and dependencies"
+      ${BFD_LIBRARIES})
+    if(TARGET_OS_FREEBSD AND NOT TARGET_OS_DEBIAN_FREEBSD)
+      set(BFD_LIBRARIES ${BFD_LIBRARIES} iconv)
+    endif()
+  endif()
+endif()
+
+macro(setup_compile_flags)
+  # LY: save initial C/CXX flags
+  if(NOT INITIAL_CMAKE_FLAGS_SAVED)
+    if(MSVC)
+      string(REGEX REPLACE "^(.*)(/EHsc)( *)(.*)$" "\\1/EHs\\3\\4" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+    endif()
+    set(INITIAL_CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} CACHE STRING "Initial CMake's flags" FORCE)
+    set(INITIAL_CMAKE_C_FLAGS ${CMAKE_C_FLAGS} CACHE STRING "Initial CMake's flags" FORCE)
+    set(INITIAL_CMAKE_EXE_LINKER_FLAGS ${CMAKE_EXE_LINKER_FLAGS} CACHE STRING "Initial CMake's flags" FORCE)
+    set(INITIAL_CMAKE_SHARED_LINKER_FLAGS ${CMAKE_SHARED_LINKER_FLAGS} CACHE STRING "Initial CMake's flags" FORCE)
+    set(INITIAL_CMAKE_STATIC_LINKER_FLAGS ${CMAKE_STATIC_LINKER_FLAGS} CACHE STRING "Initial CMake's flags" FORCE)
+    set(INITIAL_CMAKE_MODULE_LINKER_FLAGS ${CMAKE_MODULE_LINKER_FLAGS} CACHE STRING "Initial CMake's flags" FORCE)
+    set(INITIAL_CMAKE_FLAGS_SAVED TRUE CACHE INTERNAL "State of initial CMake's flags" FORCE)
+  endif()
+
+  # LY: reset C/CXX flags
+  set(CXX_FLAGS ${INITIAL_CMAKE_CXX_FLAGS})
+  set(C_FLAGS ${INITIAL_CMAKE_C_FLAGS})
+  set(EXE_LINKER_FLAGS ${INITIAL_CMAKE_EXE_LINKER_FLAGS})
+  set(SHARED_LINKER_FLAGS ${INITIAL_CMAKE_SHARED_LINKER_FLAGS})
+  set(STATIC_LINKER_FLAGS ${INITIAL_CMAKE_STATIC_LINKER_FLAGS})
+  set(MODULE_LINKER_FLAGS ${INITIAL_CMAKE_MODULE_LINKER_FLAGS})
+
+  if(CC_HAS_FEXCEPTIONS)
+    add_compile_flags("C;CXX" "-fexceptions")
+  endif()
+  if(CC_HAS_FCXX_EXCEPTIONS)
+    add_compile_flags("CXX" "-fcxx-exceptions -frtti")
+  endif()
+
+  # In C a global variable without a storage specifier (static/extern) and
+  # without an initialiser is called a ’tentative definition’. The
+  # language permits multiple tentative definitions in the single
+  # translation unit; i.e. int foo; int foo; is perfectly ok. GNU
+  # toolchain goes even further, allowing multiple tentative definitions
+  # in *different* translation units. Internally, variables introduced via
+  # tentative definitions are implemented as ‘common’ symbols. Linker
+  # permits multiple definitions if they are common symbols, and it picks
+  # one arbitrarily for inclusion in the binary being linked.
+  #
+  # -fno-common forces GNU toolchain to behave in a more
+  # standard-conformant way in respect to tentative definitions and it
+  # prevents common symbols generation. Since we are a cross-platform
+  # project it really makes sense. There are toolchains that don’t
+  # implement GNU style handling of the tentative definitions and there
+  # are platforms lacking proper support for common symbols (osx).
+  if(CC_HAS_FNO_COMMON)
+    add_compile_flags("C;CXX" "-fno-common")
+  endif()
+
+  if(CC_HAS_GGDB)
+    add_compile_flags("C;CXX" "-ggdb")
+  endif()
+
+  if(CC_HAS_WNO_UNKNOWN_PRAGMAS AND NOT HAVE_OPENMP)
+    add_compile_flags("C;CXX" -Wno-unknown-pragmas)
+  endif()
+
+  if(CC_HAS_SECTIONS)
+    add_compile_flags("C;CXX" -ffunction-sections -fdata-sections)
+  elseif(MSVC)
+    add_compile_flags("C;CXX" /Gy)
+  endif()
+
+  # We must set -fno-omit-frame-pointer here, since we rely
+  # on frame pointer when getting a backtrace, and it must
+  # be used consistently across all object files.
+  # The same reasoning applies to -fno-stack-protector switch.
+  if(ENABLE_BACKTRACE)
+    if(CC_HAS_FNO_OMIT_FRAME_POINTER)
+      add_compile_flags("C;CXX" "-fno-omit-frame-pointer")
+    endif()
+  endif()
+
+  if(MSVC)
+    if (MSVC_VERSION LESS 1900)
+      message(FATAL_ERROR "At least \"Microsoft C/C++ Compiler\" version 19.0.24234.1 (Visual Studio 2015 Update 3) is required.")
+    endif()
+    add_compile_flags("CXX" "/Zc:__cplusplus")
+    add_compile_flags("C;CXX" "/W4")
+    add_compile_flags("C;CXX" "/utf-8")
+  else()
+    if(CC_HAS_WALL)
+      add_compile_flags("C;CXX" "-Wall")
+    endif()
+    if(CC_HAS_WEXTRA)
+      add_compile_flags("C;CXX" "-Wextra")
+    endif()
+  endif()
+
+  if(CMAKE_COMPILER_IS_GNU${CMAKE_PRIMARY_LANG}
+      AND CMAKE_${CMAKE_PRIMARY_LANG}_COMPILER_VERSION VERSION_LESS 5)
+    # G++ bug. http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31488
+    add_compile_flags("CXX" "-Wno-invalid-offsetof")
+  endif()
+
+  add_definitions("-D__STDC_FORMAT_MACROS=1")
+  add_definitions("-D__STDC_LIMIT_MACROS=1")
+  add_definitions("-D__STDC_CONSTANT_MACROS=1")
+  add_definitions("-D_HAS_EXCEPTIONS=1")
+
+  # Only add -Werror if it's a debug build, done by developers.
+  # Release builds should not cause extra trouble.
+  if(CC_HAS_WERROR AND (CI OR CMAKE_CONFIGURATION_TYPES OR CMAKE_BUILD_TYPE STREQUAL "Debug"))
+    if(MSVC)
+      add_compile_flags("C;CXX" "/WX")
+    elseif(CMAKE_COMPILER_IS_CLANG)
+      if (NOT CMAKE_${CMAKE_PRIMARY_LANG}_COMPILER_VERSION VERSION_LESS 6)
+        add_compile_flags("C;CXX" "-Werror")
+      endif()
+    elseif(CMAKE_COMPILER_IS_GNUCC)
+      if (NOT CMAKE_${CMAKE_PRIMARY_LANG}_COMPILER_VERSION VERSION_LESS 6)
+        add_compile_flags("C;CXX" "-Werror")
+      endif()
+    else()
+      add_compile_flags("C;CXX" "-Werror")
+    endif()
+  endif()
+
+  if(HAVE_OPENMP)
+    add_compile_flags("C;CXX" "-fopenmp")
+  endif()
+
+  if (ENABLE_ASAN)
+    add_compile_flags("C;CXX" -fsanitize=address)
+  endif()
+
+  if(ENABLE_GCOV)
+    if(NOT HAVE_GCOV)
+      message(FATAL_ERROR
+        "ENABLE_GCOV option requested but gcov library is not found")
+    endif()
+
+    add_compile_flags("C;CXX" "-fprofile-arcs" "-ftest-coverage")
+    set(EXE_LINKER_FLAGS "${EXE_LINKER_FLAGS} -fprofile-arcs -ftest-coverage")
+    set(SHARED_LINKER_FLAGS "${SHARED_LINKER_FLAGS} -fprofile-arcs -ftest-coverage")
+    set(MODULE_LINKER_FLAGS "${MODULE_LINKER_FLAGS} -fprofile-arcs -ftest-coverage")
+    # add_library(gcov SHARED IMPORTED)
+  endif()
+
+  if(ENABLE_GPROF)
+    add_compile_flags("C;CXX" "-pg")
+  endif()
+
+  if(CMAKE_COMPILER_IS_GNUCC AND LTO_ENABLED)
+    add_compile_flags("C;CXX" ${GCC_LTO_CFLAGS})
+    set(EXE_LINKER_FLAGS "${EXE_LINKER_FLAGS} ${GCC_LTO_CFLAGS} -fverbose-asm -fwhole-program")
+    set(SHARED_LINKER_FLAGS "${SHARED_LINKER_FLAGS} ${GCC_LTO_CFLAGS} -fverbose-asm")
+    set(MODULE_LINKER_FLAGS "${MODULE_LINKER_FLAGS} ${GCC_LTO_CFLAGS} -fverbose-asm")
+    if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5)
+      # Pass the same optimization flags to the linker
+      set(compile_flags "${CMAKE_C_FLAGS} ${CMAKE_C_FLAGS_${CMAKE_BUILD_TYPE_UPPERCASE}}")
+      set(EXE_LINKER_FLAGS "${EXE_LINKER_FLAGS} ${compile_flags}")
+      set(SHARED_LINKER_FLAGS "${SHARED_LINKER_FLAGS} ${compile_flags}")
+      set(MODULE_LINKER_FLAGS "${MODULE_LINKER_FLAGS} ${compile_flags}")
+      unset(compile_flags)
+    else()
+      add_compile_flags("CXX" "-flto-odr-type-merging")
+    endif()
+  endif()
+
+  if(MSVC AND LTO_ENABLED)
+    add_compile_flags("C;CXX" "/GL")
+    foreach(linkmode IN ITEMS EXE SHARED STATIC MODULE)
+      set(${linkmode}_LINKER_FLAGS "${${linkmode}_LINKER_FLAGS} /LTCG")
+      string(REGEX REPLACE "^(.*)(/INCREMENTAL:NO *)(.*)$" "\\1\\3" ${linkmode}_LINKER_FLAGS "${${linkmode}_LINKER_FLAGS}")
+      string(REGEX REPLACE "^(.*)(/INCREMENTAL:YES *)(.*)$" "\\1\\3" ${linkmode}_LINKER_FLAGS "${${linkmode}_LINKER_FLAGS}")
+      string(REGEX REPLACE "^(.*)(/INCREMENTAL *)(.*)$" "\\1\\3" ${linkmode}_LINKER_FLAGS "${${linkmode}_LINKER_FLAGS}")
+      string(STRIP "${${linkmode}_LINKER_FLAGS}" ${linkmode}_LINKER_FLAGS)
+      foreach(config IN LISTS CMAKE_CONFIGURATION_TYPES ITEMS Release MinSizeRel RelWithDebInfo Debug)
+        string(TOUPPER "${config}" config_uppercase)
+        if(DEFINED "CMAKE_${linkmode}_LINKER_FLAGS_${config_uppercase}")
+          string(REGEX REPLACE "^(.*)(/INCREMENTAL:NO *)(.*)$" "\\1\\3" altered_flags "${CMAKE_${linkmode}_LINKER_FLAGS_${config_uppercase}}")
+          string(REGEX REPLACE "^(.*)(/INCREMENTAL:YES *)(.*)$" "\\1\\3" altered_flags "${altered_flags}")
+          string(REGEX REPLACE "^(.*)(/INCREMENTAL *)(.*)$" "\\1\\3" altered_flags "${altered_flags}")
+          string(STRIP "${altered_flags}" altered_flags)
+          if(NOT "${altered_flags}" STREQUAL "${CMAKE_${linkmode}_LINKER_FLAGS_${config_uppercase}}")
+            set(CMAKE_${linkmode}_LINKER_FLAGS_${config_uppercase} "${altered_flags}" CACHE STRING "Altered: '/INCREMENTAL' removed for LTO" FORCE)
+          endif()
+        endif()
+      endforeach(config)
+    endforeach(linkmode)
+    unset(linkmode)
+
+    foreach(config IN LISTS CMAKE_CONFIGURATION_TYPES ITEMS Release MinSizeRel RelWithDebInfo)
+      foreach(lang IN ITEMS C CXX)
+        string(TOUPPER "${config}" config_uppercase)
+        if(DEFINED "CMAKE_${lang}_FLAGS_${config_uppercase}")
+          string(REPLACE "/O2" "/Ox" altered_flags "${CMAKE_${lang}_FLAGS_${config_uppercase}}")
+          if(NOT "${altered_flags}" STREQUAL "${CMAKE_${lang}_FLAGS_${config_uppercase}}")
+            set(CMAKE_${lang}_FLAGS_${config_uppercase} "${altered_flags}" CACHE STRING "Altered: '/O2' replaced by '/Ox' for LTO" FORCE)
+          endif()
+        endif()
+        unset(config_uppercase)
+      endforeach(lang)
+    endforeach(config)
+    unset(altered_flags)
+    unset(lang)
+    unset(config)
+  endif()
+
+  if(CMAKE_COMPILER_IS_CLANG AND OSX_ARCHITECTURES)
+    set(EXE_LINKER_FLAGS "${EXE_LINKER_FLAGS} -Wl,-keep_dwarf_unwind")
+    set(SHARED_LINKER_FLAGS "${SHARED_LINKER_FLAGS} -Wl,-keep_dwarf_unwind")
+    set(MODULE_LINKER_FLAGS "${MODULE_LINKER_FLAGS} -Wl,-keep_dwarf_unwind")
+  endif()
+
+  if(CMAKE_COMPILER_IS_CLANG AND LTO_ENABLED)
+    if(CMAKE_${CMAKE_PRIMARY_LANG}_COMPILER_VERSION VERSION_LESS 3.9)
+      set(CLANG_LTO_FLAG "-flto")
+    else()
+      set(CLANG_LTO_FLAG "-flto=thin")
+    endif()
+    add_compile_flags("C;CXX" ${CLANG_LTO_FLAG})
+    set(EXE_LINKER_FLAGS "${EXE_LINKER_FLAGS} ${CLANG_LTO_FLAG} -fverbose-asm -fwhole-program")
+    set(SHARED_LINKER_FLAGS "${SHARED_LINKER_FLAGS} ${CLANG_LTO_FLAG} -fverbose-asm")
+    set(MODULE_LINKER_FLAGS "${MODULE_LINKER_FLAGS} ${CLANG_LTO_FLAG} -fverbose-asm")
+  endif()
+
+  # LY: push C/CXX flags into the cache
+  set(CMAKE_CXX_FLAGS ${CXX_FLAGS} CACHE STRING "Flags used by the C++ compiler during all build types" FORCE)
+  set(CMAKE_C_FLAGS ${C_FLAGS} CACHE STRING "Flags used by the C compiler during all build types" FORCE)
+  set(CMAKE_EXE_LINKER_FLAGS ${EXE_LINKER_FLAGS} CACHE STRING "Flags used by the linker" FORCE)
+  set(CMAKE_SHARED_LINKER_FLAGS ${SHARED_LINKER_FLAGS} CACHE STRING "Flags used by the linker during the creation of dll's" FORCE)
+  set(CMAKE_STATIC_LINKER_FLAGS ${STATIC_LINKER_FLAGS} CACHE STRING "Flags used by the linker during the creation of static libraries" FORCE)
+  set(CMAKE_MODULE_LINKER_FLAGS ${MODULE_LINKER_FLAGS} CACHE STRING "Flags used by the linker during the creation of modules" FORCE)
+  unset(CXX_FLAGS)
+  unset(C_FLAGS)
+  unset(EXE_LINKER_FLAGS)
+  unset(SHARED_LINKER_FLAGS)
+  unset(STATIC_LINKER_FLAGS)
+  unset(MODULE_LINKER_FLAGS)
+endmacro(setup_compile_flags)
+
+# determine library for for std::filesystem
+set(LIBCXX_FILESYSTEM "")
+if(CMAKE_COMPILER_IS_GNUCXX)
+  if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9.0)
+    set(LIBCXX_FILESYSTEM "stdc++fs")
+  endif()
+elseif (CMAKE_COMPILER_IS_CLANG)
+  if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0)
+    set(LIBCXX_FILESYSTEM "c++experimental")
+  else()
+    set(LIBCXX_FILESYSTEM "stdc++fs")
+  endif()
+endif()
+
+cmake_policy(POP)