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libmdbx/cmake/compiler.cmake
Леонид Юрьев (Leonid Yuriev) 3a0b857e1d mdbx-cmake: используем -flto=auto для GCC >= 11.4 
При сборке посредством GCC >= 11.4 больше не возникает предупреждений:
  lto-wrapper: warning: using serial compilation of # LTRANS jobs
  lto-wrapper: note: see the ‘-flto’ option documentation for more information

Однако, использование auto-режима не является оптимальным решением, так
как при параллельной сборке посредством make или ninja, каждая уже
запущенная ветвь компиляции породит потоки ещё для каждого ядра ЦПУ.

Таким образом реальная нагрузка может расти квадратично, т.е. чем больше
у вас ядер -- тем хуже и при 96 ядрах может работать 9216 потоков сборки.

Тем не менее, использование `job-server` в CMake пока не возможно, а при
сборке libmdbx не так много работы чтобы чтобы обрушить систему нагрузкой.
2025-01-27 21:30:01 +03:00

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# Copyright (c) 2010-2025 Леонид Юрьев aka Leonid Yuriev <leo@yuriev.ru> ###############################################
# SPDX-License-Identifier: Apache-2.0
if(CMAKE_VERSION VERSION_LESS 3.8.2)
cmake_minimum_required(VERSION 3.0.2)
elseif(CMAKE_VERSION VERSION_LESS 3.12)
cmake_minimum_required(VERSION 3.8.2)
else()
cmake_minimum_required(VERSION 3.12)
endif()
cmake_policy(PUSH)
cmake_policy(VERSION ${CMAKE_MINIMUM_REQUIRED_VERSION})
if(NOT CMAKE_VERSION VERSION_LESS 3.21)
cmake_policy(SET CMP0126 NEW)
endif()
if(NOT CMAKE_VERSION VERSION_LESS 3.17)
cmake_policy(SET CMP0102 NEW)
endif()
if(NOT CMAKE_VERSION VERSION_LESS 3.15)
cmake_policy(SET CMP0091 NEW)
endif()
if(NOT CMAKE_VERSION VERSION_LESS 3.13)
cmake_policy(SET CMP0077 NEW)
endif()
if(NOT CMAKE_VERSION VERSION_LESS 3.12)
cmake_policy(SET CMP0075 NEW)
endif()
if(NOT CMAKE_VERSION VERSION_LESS 3.9)
cmake_policy(SET CMP0068 NEW)
cmake_policy(SET CMP0069 NEW)
endif()
cmake_policy(SET CMP0054 NEW)
if(CMAKE_VERSION MATCHES ".*MSVC.*" AND CMAKE_VERSION VERSION_LESS 3.16)
message(FATAL_ERROR "CMake from MSVC kit is unfit! "
"Please use MSVC-2019 with modern CMake the original CMake from https://cmake.org/download/")
endif()
if(NOT (CMAKE_C_COMPILER_LOADED OR CMAKE_CXX_COMPILER_LOADED))
message(FATAL_ERROR "This module required C or C++ to be enabled")
endif()
if(CMAKE_CXX_COMPILER_LOADED)
include(CheckCXXSourceRuns)
include(CheckCXXSourceCompiles)
include(CheckCXXCompilerFlag)
endif()
if(CMAKE_C_COMPILER_LOADED)
include(CheckCSourceRuns)
include(CheckCSourceCompiles)
include(CheckCCompilerFlag)
endif()
include(CMakeDependentOption)
include(CheckLibraryExists)
include(CheckIncludeFiles)
# Check if the same compile family is used for both C and CXX
if(CMAKE_C_COMPILER_LOADED
AND CMAKE_CXX_COMPILER_LOADED
AND NOT (CMAKE_C_COMPILER_ID STREQUAL CMAKE_CXX_COMPILER_ID))
message(WARNING "CMAKE_C_COMPILER_ID (${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 MATCHES ".*[Cc][Ll][Aa][Nn][Gg].*")
set(CMAKE_COMPILER_IS_CLANG ON)
set(CMAKE_COMPILER_IS_GNUCC OFF)
endif()
if(CMAKE_CXX_COMPILER_LOADED AND CMAKE_CXX_COMPILER_ID MATCHES ".*[Cc][Ll][Aa][Nn][Gg].*")
set(CMAKE_COMPILER_IS_CLANG ON)
set(CMAKE_COMPILER_IS_GNUCXX OFF)
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
OUTPUT_STRIP_TRAILING_WHITESPACE)
set(CMAKE_COMPILER_IS_ELBRUSC ON)
set(CMAKE_C_COMPILER_ID "Elbrus")
message(STATUS "Detected Elbrus C compiler ${CMAKE_C_COMPILER_VERSION}")
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
OUTPUT_STRIP_TRAILING_WHITESPACE)
set(CMAKE_COMPILER_IS_ELBRUSCXX ON)
set(CMAKE_CXX_COMPILER_ID "Elbrus")
message(STATUS "Detected Elbrus C++ compiler ${CMAKE_CXX_COMPILER_VERSION}")
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()
# 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 AND NOT CMAKE_COMPILER_IS_ELBRUSC)
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 AND NOT CMAKE_COMPILER_IS_ELBRUSCXX)
message(FATAL_ERROR "
Your G++ version is ${CMAKE_CXX_COMPILER_VERSION}, please update")
endif()
endif()
if(CMAKE_CL_64)
set(MSVC64 1)
endif()
if(WIN32 AND CMAKE_COMPILER_IS_GNU${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(NOT DEFINED IOS)
if(APPLE
AND (CMAKE_SYSTEM_NAME STREQUAL "iOS"
OR DEFINED CMAKE_IOS_DEVELOPER_ROOT
OR DEFINED IOS_PLATFORM
OR DEFINED IOS_ARCH
))
set(IOS TRUE)
else()
set(IOS FALSE)
endif()
endif()
if(NOT DEFINED CMAKE_TARGET_BITNESS)
if(CMAKE_SIZEOF_VOID_P LESS 4)
set(CMAKE_TARGET_BITNESS 16)
elseif(CMAKE_SIZEOF_VOID_P LESS 8)
set(CMAKE_TARGET_BITNESS 32)
else()
set(CMAKE_TARGET_BITNESS 64)
endif()
endif()
if(NOT CMAKE_SYSTEM_ARCH)
if(CMAKE_${CMAKE_PRIMARY_LANG}_COMPILER_ARCHITECTURE_ID)
string(TOLOWER "${CMAKE_${CMAKE_PRIMARY_LANG}_COMPILER_ARCHITECTURE_ID}" CMAKE_SYSTEM_ARCH)
if(CMAKE_SYSTEM_ARCH STREQUAL "x86")
set(X86_32 TRUE)
elseif(CMAKE_SYSTEM_ARCH STREQUAL "x86_64" OR CMAKE_SYSTEM_ARCH STREQUAL "x64")
set(X86_64 TRUE)
set(CMAKE_SYSTEM_ARCH "x86_64")
elseif(CMAKE_SYSTEM_ARCH MATCHES "^(aarch.*|arm.*)")
if(CMAKE_TARGET_BITNESS EQUAL 64)
set(AARCH64 TRUE)
else()
set(ARM32 TRUE)
endif()
endif()
elseif(CMAKE_ANDROID_ARCH_ABI)
set(CMAKE_SYSTEM_ARCH "${CMAKE_ANDROID_ARCH_ABI}")
if(CMAKE_SYSTEM_ARCH STREQUAL "x86")
set(X86_32 TRUE)
elseif(CMAKE_SYSTEM_ARCH STREQUAL "x86_64")
set(X86_64 TRUE)
elseif(CMAKE_SYSTEM_ARCH MATCHES "^(aarch.*|AARCH.*|arm.*|ARM.*)")
if(CMAKE_TARGET_BITNESS EQUAL 64)
set(AARCH64 TRUE)
else()
set(ARM32 TRUE)
endif()
elseif(CMAKE_SYSTEM_ARCH MATCHES "^(mips|MIPS).*")
if(CMAKE_TARGET_BITNESS EQUAL 64)
set(MIPS64 TRUE)
else()
set(MIPS32 TRUE)
endif()
endif()
elseif(
CMAKE_COMPILER_IS_ELBRUSC
OR CMAKE_COMPILER_IS_ELBRUSCXX
OR CMAKE_${CMAKE_PRIMARY_LANG}_COMPILER_ID STREQUAL "LCC"
OR CMAKE_SYSTEM_PROCESSOR MATCHES "e2k.*|E2K.*|elbrus.*|ELBRUS.*")
set(E2K TRUE)
set(CMAKE_SYSTEM_ARCH "Elbrus")
elseif(
MSVC64
OR MINGW64
OR MINGW
OR (MSVC AND NOT CMAKE_CROSSCOMPILING))
if(CMAKE_TARGET_BITNESS EQUAL 64)
set(X86_64 TRUE)
set(CMAKE_SYSTEM_ARCH "x86_64")
else()
set(X86_32 TRUE)
set(CMAKE_SYSTEM_ARCH "x86")
endif()
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "amd64.*|[xXiI]86_64.*|AMD64.*|[iI][3-6]86.*|[xXiI]86.*")
if(CMAKE_TARGET_BITNESS EQUAL 64)
set(X86_64 TRUE)
set(CMAKE_SYSTEM_ARCH "x86_64")
else()
set(X86_32 TRUE)
set(CMAKE_SYSTEM_ARCH "x86")
endif()
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch.*|AARCH.*|arm.*|ARM.*)")
if(CMAKE_TARGET_BITNESS EQUAL 64)
set(AARCH64 TRUE)
set(CMAKE_SYSTEM_ARCH "ARM64")
else()
set(ARM32 TRUE)
set(CMAKE_SYSTEM_ARCH "ARM")
endif()
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(powerpc|ppc).*")
if(CMAKE_TARGET_BITNESS EQUAL 64)
set(PPC64 TRUE)
set(CMAKE_SYSTEM_ARCH "PPC64")
else()
set(PPC32 TRUE)
set(CMAKE_SYSTEM_ARCH "PPC")
endif()
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(mips|MIPS).*")
if(CMAKE_TARGET_BITNESS EQUAL 64)
set(MIPS64 TRUE)
set(CMAKE_SYSTEM_ARCH "MIPS64")
else()
set(MIPS32 TRUE)
set(CMAKE_SYSTEM_ARCH "MIPS")
endif()
endif()
endif()
if(CMAKE_C_COMPILER_LOADED AND NOT CMAKE_C_COMPILER_ARCHITECTURE_ID)
set(CMAKE_C_COMPILER_ARCHITECTURE_ID "${CMAKE_SYSTEM_ARCH}")
endif()
if(CMAKE_CXX_COMPILER_LOADED AND NOT CMAKE_CXX_COMPILER_ARCHITECTURE_ID)
set(CMAKE_CXX_COMPILER_ARCHITECTURE_ID "${CMAKE_SYSTEM_ARCH}")
endif()
if(NOT CMAKE_HOST_ARCH)
if(CMAKE_VS_PLATFORM_TOOLSET_HOST_ARCHITECTURE)
set(CMAKE_HOST_ARCH "${CMAKE_VS_PLATFORM_TOOLSET_HOST_ARCHITECTURE}")
elseif(CMAKE_HOST_PROCESSOR MATCHES "e2k.*|E2K.*|elbrus.*|ELBRUS.*")
set(CMAKE_HOST_ARCH "Elbrus")
elseif(CMAKE_HOST_PROCESSOR MATCHES "amd64.*|[xXiI]86_64.*|AMD64.*")
set(CMAKE_HOST_ARCH "x86_64")
elseif(CMAKE_HOST_PROCESSOR MATCHES "[iI][3-6]86.*|[xXiI]86.*")
set(CMAKE_HOST_ARCH "x86")
elseif(CMAKE_HOST_PROCESSOR MATCHES "^(aarch64.*|AARCH64.*|ARM64.*)")
set(CMAKE_HOST_ARCH "ARM64")
elseif(CMAKE_HOST_PROCESSOR MATCHES "^(arm.*|ARM.*)")
set(CMAKE_HOST_ARCH "ARM")
elseif(CMAKE_HOST_PROCESSOR MATCHES "^(powerpc|ppc)64.*")
set(CMAKE_HOST_ARCH "PPC64")
elseif(CMAKE_HOST_PROCESSOR MATCHES "^(powerpc|ppc).*")
set(CMAKE_HOST_ARCH "PPC")
elseif(CMAKE_HOST_PROCESSOR MATCHES "^(mips|MIPS)64.*")
set(CMAKE_HOST_ARCH "MIPS64")
elseif(CMAKE_HOST_PROCESSOR MATCHES "^(mips|MIPS).*")
set(CMAKE_HOST_ARCH "MIPS")
else()
set(CMAKE_HOST_ARCH "${CMAKE_HOST_SYSTEM_PROCESSOR}")
endif()
endif()
if(NOT DEFINED CMAKE_HOST_CAN_RUN_EXECUTABLES_BUILT_FOR_TARGET)
if(CMAKE_CROSSCOMPILING AND CMAKE_CROSSCOMPILING_EMULATOR)
set(CMAKE_HOST_CAN_RUN_EXECUTABLES_BUILT_FOR_TARGET TRUE)
elseif(CMAKE_CROSSCOMPILING AND NOT CMAKE_CROSSCOMPILING_EMULATOR)
set(CMAKE_HOST_CAN_RUN_EXECUTABLES_BUILT_FOR_TARGET FALSE)
elseif(
CMAKE_SYSTEM_NAME STREQUAL CMAKE_HOST_SYSTEM_NAME
AND ((CMAKE_SYSTEM_PROCESSOR STREQUAL CMAKE_HOST_PROCESSOR)
OR (CMAKE_SYSTEM_ARCH STREQUAL CMAKE_HOST_ARCH)
OR (WIN32
AND CMAKE_HOST_WIN32
AND X86_32
AND CMAKE_HOST_ARCH STREQUAL "x86_64"
)
))
set(CMAKE_HOST_CAN_RUN_EXECUTABLES_BUILT_FOR_TARGET TRUE)
message(STATUS "Assume СAN RUN A BUILT EXECUTABLES," " since host (${CMAKE_HOST_SYSTEM_NAME}-${CMAKE_HOST_ARCH})"
" match target (${CMAKE_SYSTEM_NAME}-${CMAKE_SYSTEM_ARCH})")
else()
if(CMAKE_C_COMPILER_LOADED)
include(CheckCSourceRuns)
check_c_source_runs("int main(void) { return 0; }" CMAKE_HOST_CAN_RUN_EXECUTABLES_BUILT_FOR_TARGET)
elseif(CMAKE_CXX_COMPILER_LOADED)
include(CheckCXXSourceRuns)
check_cxx_source_runs("int main(void) { return 0; }" CMAKE_HOST_CAN_RUN_EXECUTABLES_BUILT_FOR_TARGET)
endif()
if(NOT CMAKE_HOST_CAN_RUN_EXECUTABLES_BUILT_FOR_TARGET)
message(STATUS "Force CMAKE_CROSSCOMPILING to TRUE")
set(CMAKE_CROSSCOMPILING TRUE)
endif()
endif()
endif()
if(MSVC)
check_compiler_flag("/WX" CC_HAS_WERROR)
check_compiler_flag("/fsanitize=address" CC_HAS_ASAN)
check_compiler_flag("/fsanitize=undefined" CC_HAS_UBSAN)
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_compiler_flag("-fno-semantic-interposition" CC_HAS_FNO_SEMANTIC_INTERPOSITION)
if(CMAKE_CXX_COMPILER_LOADED)
check_cxx_compiler_flag("-fcxx-exceptions" CC_HAS_FCXX_EXCEPTIONS)
endif()
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_FRIENDLY_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_compiler_flag("-Wno-attributes" CC_HAS_WNO_ATTRIBUTES)
# Check for an omp support
set(CMAKE_REQUIRED_FLAGS "-fopenmp -Werror")
if(CMAKE_CXX_COMPILER_LOADED)
check_cxx_source_compiles(
"int main(void) {
#pragma omp for
for(int i = 0, j = 0; i != 42; i = 1 + i * 12345) j += i % 43;
return j;
}"
HAVE_OPENMP)
else()
check_c_source_compiles(
"int main(void) {
#pragma omp for
for(int i = 0, j = 0; i != 42; i = 1 + i * 12345) j += i % 43;
return j;
}"
HAVE_OPENMP)
endif()
set(CMAKE_REQUIRED_FLAGS "")
endif()
# Crutch for old C++ compilers and/or CMake to enabling C++11
if(CMAKE_CXX_COMPILER_LOADED)
list(FIND CMAKE_CXX_COMPILE_FEATURES cxx_std_11 HAS_CXX11)
if(HAS_CXX11 LESS 0)
if(MSVC)
check_cxx_compiler_flag("/std:c++11" CXX_FALLBACK_11)
else()
check_cxx_compiler_flag("-std=gnu++11" CXX_FALLBACK_GNU11)
if(NOT CXX_FALLBACK_GNU11)
check_cxx_compiler_flag("-std=c++11" CXX_FALLBACK_11)
endif()
endif()
endif()
endif()
# Crutch for mad C compilers and/or CMake to enabling C11
if(CMAKE_C_COMPILER_LOADED)
list(FIND CMAKE_C_COMPILE_FEATURES c_std_11 HAS_C11)
if(HAS_C11 LESS 0)
if(MSVC)
check_c_compiler_flag("/std:c11" C_FALLBACK_11)
else()
check_c_compiler_flag("-std=gnu11" C_FALLBACK_GNU11)
if(NOT C_FALLBACK_GNU11)
check_c_compiler_flag("-std=c11" C_FALLBACK_11)
endif()
endif()
endif()
endif()
# Check for LTO support by GCC
if(CMAKE_COMPILER_IS_GNU${CMAKE_PRIMARY_LANG}
AND NOT CMAKE_COMPILER_IS_ELBRUSC
AND NOT CMAKE_COMPILER_IS_ELBRUSCXX)
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 ${gcc_collect})
if(gcc_suffix_valid)
string(REGEX REPLACE "^(.*(cc|\\+\\+))(-.+)$" "\\3" 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}, ${CMAKE_GCC_RANLIB}")
if(CMAKE_${CMAKE_PRIMARY_LANG}_COMPILER_VERSION VERSION_LESS 11.4)
set(GCC_LTO_CFLAGS "-flto -fno-fat-lto-objects -fuse-linker-plugin")
else()
set(GCC_LTO_CFLAGS "-flto=auto -fno-fat-lto-objects -fuse-linker-plugin")
endif()
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 AND NOT CMAKE_COMPILER_IS_CLANG)
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
RESULT_VARIABLE clang_probe_result
ERROR_QUIET)
unset(clang_bindirs)
unset(clang_bindirs_x)
unset(clang_libdirs)
unset(clang_libdirs_x)
if(clang_probe_result EQUAL 0)
string(REGEX MATCH "(^|\n.*)(.*programs: =)([^\n]+)((\n.*)|$)" regexp_valid ${clang_search_dirs})
if(regexp_valid)
string(REGEX REPLACE "(^|\n.*)(.*programs: =)([^\n]+)((\n.*)|$)" "\\3" list ${clang_search_dirs})
string(REPLACE ":" ";" list "${list}")
set(libs_extra_subdirs "lib;../lib;lib64;../lib64;lib32;../lib32")
foreach(dir IN LISTS list)
get_filename_component(dir "${dir}" REALPATH)
if(dir MATCHES ".*llvm.*" OR dir MATCHES ".*clang.*")
set(list_suffix "")
else()
set(list_suffix "_x")
endif()
list(APPEND clang_bindirs${list_suffix} "${dir}")
foreach(subdir IN LISTS libs_extra_subdirs)
get_filename_component(subdir "${dir}/${subdir}" REALPATH)
if(EXISTS "${subdir}")
list(APPEND clang_libdirs${list_suffix} "${subdir}")
endif()
endforeach()
endforeach()
list(APPEND clang_bindirs "${clang_bindirs_x}")
list(REMOVE_DUPLICATES clang_bindirs)
endif()
string(REGEX MATCH "(^|\n.*)(.*libraries: =)([^\n]+)((\n.*)|$)" regexp_valid ${clang_search_dirs})
if(regexp_valid)
string(REGEX REPLACE "(^|\n.*)(.*libraries: =)([^\n]+)((\n.*)|$)" "\\3" list ${clang_search_dirs})
string(REPLACE ":" ";" list "${list}")
foreach(dir IN LISTS list)
get_filename_component(dir "${dir}" REALPATH)
if(dir MATCHES ".*llvm.*" OR dir MATCHES ".*clang.*")
set(list_suffix "")
else()
set(list_suffix "_x")
endif()
list(APPEND clang_libdirs${list_suffix} "${dir}")
endforeach()
list(APPEND clang_libdirs "${clang_libdirs_x}")
list(REMOVE_DUPLICATES clang_libdirs)
endif()
else()
get_filename_component(clang_bindirs ${CMAKE_${CMAKE_PRIMARY_LANG}_COMPILER} DIRECTORY)
if(CMAKE_HOST_SYSTEM_NAME STREQUAL "Windows")
set(clang_libdirs ${clang_bindirs})
else()
get_filename_component(clang_libdirs "${CMAKE_${CMAKE_PRIMARY_LANG}_COMPILER}/../lib" REALPATH)
endif()
endif()
if(clang_bindirs AND clang_libdirs)
message(STATUS "Found CLANG/LLVM directories: ${clang_bindirs}, ${clang_libdirs}")
else()
message(STATUS "Could NOT find CLANG/LLVM directories (bin and/or lib).")
endif()
if(NOT CMAKE_CLANG_LD AND clang_bindirs)
find_program(
CMAKE_CLANG_LD
NAMES lld-link ld.lld "ld${CMAKE_TARGET_BITNESS}.lld" lld llvm-link llvm-ld
PATHS ${clang_bindirs}
NO_DEFAULT_PATH)
endif()
if(NOT CMAKE_CLANG_AR AND clang_bindirs)
find_program(
CMAKE_CLANG_AR
NAMES llvm-ar ar
PATHS ${clang_bindirs}
NO_DEFAULT_PATH)
endif()
if(NOT CMAKE_CLANG_NM AND clang_bindirs)
find_program(
CMAKE_CLANG_NM
NAMES llvm-nm nm
PATHS ${clang_bindirs}
NO_DEFAULT_PATH)
endif()
if(NOT CMAKE_CLANG_RANLIB AND clang_bindirs)
find_program(
CMAKE_CLANG_RANLIB
NAMES llvm-ranlib ranlib
PATHS ${clang_bindirs}
NO_DEFAULT_PATH)
endif()
set(clang_lto_plugin_name "LLVMgold${CMAKE_SHARED_LIBRARY_SUFFIX}")
if(NOT CMAKE_LD_GOLD AND clang_bindirs)
find_program(
CMAKE_LD_GOLD
NAMES ld.gold
PATHS ${clang_bindirs})
endif()
if(NOT CLANG_LTO_PLUGIN AND clang_libdirs)
find_file(
CLANG_LTO_PLUGIN ${clang_lto_plugin_name}
PATHS ${clang_libdirs}
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)
message(STATUS "Found CLANG/LLVM's linker for LTO: ${CMAKE_CLANG_LD}")
else()
message(STATUS "Could NOT find CLANG/LLVM's linker (lld, llvm-ld, llvm-link) for LTO.")
endif()
if(CMAKE_CLANG_AR
AND CMAKE_CLANG_RANLIB
AND CMAKE_CLANG_NM)
message(STATUS "Found CLANG/LLVM's binutils for LTO: ${CMAKE_CLANG_AR}, ${CMAKE_CLANG_RANLIB}, ${CMAKE_CLANG_NM}")
else()
message(STATUS "Could NOT find CLANG/LLVM's binutils (ar, ranlib, nm) for LTO.")
endif()
unset(clang_lto_plugin_name)
unset(clang_libdir)
unset(clang_bindir_valid)
unset(clang_bindir)
unset(clang_search_dirs)
endif()
if(CMAKE_CLANG_AR
AND CMAKE_CLANG_NM
AND CMAKE_CLANG_RANLIB
AND ((CLANG_LTO_PLUGIN AND CMAKE_LD_GOLD) OR CMAKE_CLANG_LD OR APPLE))
if(ANDROID AND CMAKE_${CMAKE_PRIMARY_LANG}_COMPILER_VERSION VERSION_LESS 12)
set(CLANG_LTO_AVAILABLE FALSE)
message(
STATUS "Link-Time Optimization by CLANG/LLVM is available but unusable due https://reviews.llvm.org/D79919")
else()
set(CLANG_LTO_AVAILABLE TRUE)
message(STATUS "Link-Time Optimization by CLANG/LLVM is available")
endif()
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_LD)
set(CMAKE_CLANG_LD ${CMAKE_LINKER})
endif()
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)
# save initial C/CXX flags
if(NOT INITIAL_CMAKE_FLAGS_SAVED)
if(CMAKE_CXX_COMPILER_LOADED)
set(INITIAL_CMAKE_CXX_FLAGS
${CMAKE_CXX_FLAGS}
CACHE STRING "Initial CMake's flags" FORCE)
endif()
if(CMAKE_C_COMPILER_LOADED)
set(INITIAL_CMAKE_C_FLAGS
${CMAKE_C_FLAGS}
CACHE STRING "Initial CMake's flags" FORCE)
endif()
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()
# reset C/CXX flags
if(CMAKE_CXX_COMPILER_LOADED)
set(CXX_FLAGS ${INITIAL_CMAKE_CXX_FLAGS})
# Crutch for old C++ compilers and/or CMake to enabling C++11
if(CXX_FALLBACK_GNU11)
add_compile_flags("CXX" "-std=gnu++11")
elseif(CXX_FALLBACK_11)
add_compile_flags("CXX" "-std=c++11")
endif()
endif()
if(CMAKE_C_COMPILER_LOADED)
set(C_FLAGS ${INITIAL_CMAKE_C_FLAGS})
# Crutch for mad C compilers and/or CMake to enabling C11
if(C_FALLBACK_GNU11)
add_compile_flags("C" "-std=gnu11")
elseif(C_FALLBACK_11)
if(MSVC)
add_compile_flags("C" "/std:c11")
else()
add_compile_flags("C" "-std=c11")
endif()
endif()
endif()
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 ${INITIAL_CMAKE_MODULE_LINKER_FLAGS})
if(CC_HAS_FEXCEPTIONS)
add_compile_flags("C;CXX" "-fexceptions")
endif()
if(CC_HAS_FCXX_EXCEPTIONS)
add_compile_flags("CXX" "-fcxx-exceptions" "-frtti")
endif()
if(CC_HAS_FNO_SEMANTIC_INTERPOSITION AND NOT CMAKE_COMPILER_IS_CLANG)
add_compile_flags("C;CXX" "-fno-semantic-interposition")
endif()
if(MSVC)
# checks for /EHa or /clr options exists, i.e. is enabled structured async WinNT exceptions
string(REGEX MATCH "^(.* )*[-/]EHc*a( .*)*$" msvc_async_eh_enabled "${CXX_FLAGS}" "${C_FLAGS}")
string(REGEX MATCH "^(.* )*[-/]clr( .*)*$" msvc_clr_enabled "${CXX_FLAGS}" "${C_FLAGS}")
# remote any /EH? options
string(REGEX REPLACE "( *[-/]-*EH[csa]+ *)+" "" CXX_FLAGS "${CXX_FLAGS}")
string(REGEX REPLACE "( *[-/]-*EH[csa]+ *)+" "" C_FLAGS "${C_FLAGS}")
if(msvc_clr_enabled STREQUAL "")
if(NOT msvc_async_eh_enabled STREQUAL "")
add_compile_flags("C;CXX" "/EHa")
else()
add_compile_flags("C;CXX" "/EHsc")
endif()
endif()
endif(MSVC)
if(CC_HAS_WNO_ATTRIBUTES
AND CMAKE_COMPILER_IS_GNU${CMAKE_PRIMARY_LANG}
AND CMAKE_${CMAKE_PRIMARY_LANG}_COMPILER_VERSION VERSION_LESS 9)
# GCC < 9.x generates false-positive warnings for optimization attributes
add_compile_flags("C;CXX" "-Wno-attributes")
if(LTO_ENABLED)
add_compile_flags("C;CXX" "-Wno-lto-type-mismatch")
endif()
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()
if(NOT MSVC_VERSION LESS 1910)
add_compile_flags("CXX" "/Zc:__cplusplus")
endif()
remove_compile_flag("C;CXX" "/W3")
add_compile_flags("C;CXX" "/W4 /utf-8 /bigobj")
else()
if(CC_HAS_WALL)
add_compile_flags("C;CXX" "-Wall")
endif()
if(CC_HAS_WEXTRA)
add_compile_flags("C;CXX" "-Wextra")
endif()
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_${CMAKE_PRIMARY_LANG}_COMPILER_VERSION VERSION_LESS 6)
add_compile_flags("C;CXX" "-Werror")
endif()
else()
add_compile_flags("C;CXX" "-Werror")
endif()
endif()
if(CMAKE_COMPILER_IS_GNU${CMAKE_PRIMARY_LANG} AND CMAKE_${CMAKE_PRIMARY_LANG}_COMPILER_VERSION VERSION_LESS 5)
# G++ bug. http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31488
add_compile_flags("CXX" "-Wno-invalid-offsetof")
endif()
if(MINGW)
# Disable junk MINGW's warnings that issued due to incompatibilities and shortcomings of MINGW, since the code is
# checked by builds with GCC, CLANG and MSVC.
add_compile_flags("C;CXX" "-Wno-format-extra-args" "-Wno-format" "-Wno-cast-function-type"
"-Wno-implicit-fallthrough")
endif()
if(ENABLE_ASAN)
if(NOT MSVC)
add_compile_flags("C;CXX" "-fsanitize=address")
else()
add_compile_flags("C;CXX" "/fsanitize=address")
endif()
add_definitions(-DASAN_ENABLED=1)
endif()
if(ENABLE_UBSAN)
if(NOT MSVC)
add_compile_flags("C;CXX" "-fsanitize=undefined" "-fsanitize-undefined-trap-on-error")
else()
add_compile_flags("C;CXX" "/fsanitize=undefined")
endif()
add_definitions(-DUBSAN_ENABLED=1)
endif()
if(ENABLE_GCOV)
if(NOT HAVE_GCOV)
message(FATAL_ERROR "ENABLE_GCOV option requested but gcov library is not found")
endif()
add_compile_flags("C;CXX" "-fprofile-arcs" "-ftest-coverage")
set(EXE_LINKER_FLAGS "${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} ${compile_flags}")
unset(compile_flags)
else()
add_compile_flags("CXX" "-flto-odr-type-merging")
endif()
endif()
if(MSVC
AND NOT CMAKE_COMPILER_IS_CLANG
AND LTO_ENABLED)
add_compile_flags("C;CXX" "/GL")
foreach(linkmode IN ITEMS EXE SHARED STATIC MODULE)
set(${linkmode}_LINKER_FLAGS "${${linkmode}_LINKER_FLAGS} /LTCG")
string(REGEX REPLACE "^(.*)(/INCREMENTAL)(:YES)?(:NO)?( ?.*)$" "\\1\\2:NO\\5" ${linkmode}_LINKER_FLAGS
"${${linkmode}_LINKER_FLAGS}")
string(STRIP "${${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)(:YES)?(:NO)?( ?.*)$" "\\1\\2:NO\\5" altered_flags
"${CMAKE_${linkmode}_LINKER_FLAGS_${config_uppercase}}")
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" ${CLANG_LTO_FLAG})
if(NOT MSVC)
set(EXE_LINKER_FLAGS "${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()
endif()
# push C/CXX flags into the cache
if(CMAKE_CXX_COMPILER_LOADED)
set(CMAKE_CXX_FLAGS
${CXX_FLAGS}
CACHE STRING "Flags used by the C++ compiler during all build types" FORCE)
unset(CXX_FLAGS)
endif()
if(CMAKE_C_COMPILER_LOADED)
set(CMAKE_C_FLAGS
${C_FLAGS}
CACHE STRING "Flags used by the C compiler during all build types" FORCE)
unset(C_FLAGS)
endif()
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(EXE_LINKER_FLAGS)
unset(SHARED_LINKER_FLAGS)
unset(STATIC_LINKER_FLAGS)
unset(MODULE_LINKER_FLAGS)
endmacro(setup_compile_flags)
macro(probe_libcxx_filesystem)
if(CMAKE_CXX_COMPILER_LOADED AND NOT DEFINED LIBCXX_FILESYSTEM)
list(FIND CMAKE_CXX_COMPILE_FEATURES cxx_std_11 HAS_CXX11)
if(NOT HAS_CXX11 LESS 0
OR CXX_FALLBACK_GNU11
OR CXX_FALLBACK_11)
include(CMakePushCheckState)
include(CheckCXXSourceCompiles)
cmake_push_check_state()
set(stdfs_probe_save_libraries ${CMAKE_REQUIRED_LIBRARIES})
set(stdfs_probe_save_flags ${CMAKE_REQUIRED_FLAGS})
set(stdfs_probe_flags ${CMAKE_REQUIRED_FLAGS})
set(stdfs_probe_save_link_options ${CMAKE_REQUIRED_LINK_OPTIONS})
unset(stdfs_probe_clear_cxx_standard)
if(NOT DEFINED CMAKE_CXX_STANDARD)
list(FIND CMAKE_CXX_COMPILE_FEATURES cxx_std_14 HAS_CXX14)
list(FIND CMAKE_CXX_COMPILE_FEATURES cxx_std_17 HAS_CXX17)
if(NOT HAS_CXX17 LESS 0 AND NOT (CMAKE_COMPILER_IS_CLANG AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5))
set(CMAKE_CXX_STANDARD 17)
elseif(NOT HAS_CXX14 LESS 0)
set(CMAKE_CXX_STANDARD 14)
elseif(NOT HAS_CXX11 LESS 0)
set(CMAKE_CXX_STANDARD 11)
elseif(CXX_FALLBACK_GNU11)
set(stdfs_probe_flags ${stdfs_probe_flags} "-std=gnu++11")
else()
set(stdfs_probe_flags ${stdfs_probe_flags} "-std=c++11")
endif()
set(stdfs_probe_clear_cxx_standard ON)
endif()
if(CMAKE_COMPILER_IS_ELBRUSCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 1.25.23)
if(CMAKE_VERSION VERSION_LESS 3.14)
set(stdfs_probe_flags ${stdfs_probe_flags} "-Wl,--allow-multiple-definition")
else()
set(CMAKE_REQUIRED_LINK_OPTIONS ${stdfs_probe_save_link_options} "-Wl,--allow-multiple-definition")
endif()
endif()
set(CMAKE_REQUIRED_FLAGS ${stdfs_probe_flags})
set(stdfs_probe_code
[[
#if defined(__SIZEOF_INT128__) && !defined(__GLIBCXX_TYPE_INT_N_0) && defined(__clang__) && __clang_major__ < 4
#define __GLIBCXX_BITSIZE_INT_N_0 128
#define __GLIBCXX_TYPE_INT_N_0 __int128
#endif
#ifndef __has_include
#define __has_include(header) (0)
#endif
#if __has_include(<version>)
#include <version>
#endif
#include <cstdlib>
#include <string>
#if defined(__cpp_lib_string_view) && __cpp_lib_string_view >= 201606L
#include <string_view>
#endif
#if defined(__cpp_lib_filesystem) && __cpp_lib_filesystem >= 201703L
#include <filesystem>
#else
#include <experimental/filesystem>
#endif
#if (defined(__cpp_lib_filesystem) && __cpp_lib_filesystem >= 201703L && (!defined(__MAC_OS_X_VERSION_MIN_REQUIRED) || __MAC_OS_X_VERSION_MIN_REQUIRED >= 101500) && (!defined(__IPHONE_OS_VERSION_MIN_REQUIRED) || __IPHONE_OS_VERSION_MIN_REQUIRED >= 130100))
namespace fs = ::std::filesystem;
#elif defined(__cpp_lib_experimental_filesystem) && __cpp_lib_experimental_filesystem >= 201406L
namespace fs = ::std::experimental::filesystem;
#elif (defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED < 101500) || (defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && __IPHONE_OS_VERSION_MIN_REQUIRED < 130100)
#error "Select a newer target OSX/iOS to support C++17 std::filesystem"
#else
#error "No support for C++17 std::filesystem"
#endif
int main(int argc, const char*argv[]) {
std::string str(argv[0]);
fs::path probe(str);
if (argc != 1) throw fs::filesystem_error(std::string("fake"), std::error_code());
int r = fs::is_directory(probe.relative_path());
for (auto const& i : fs::directory_iterator(probe)) {
++r;
(void)i;
}
return r;
}
]])
set(LIBCXX_FILESYSTEM "")
check_cxx_source_compiles("${stdfs_probe_code}" LIBCXX_FILESYSTEM_none)
if(LIBCXX_FILESYSTEM_none)
message(STATUS "No linking with additional library needed for std::filesystem")
else()
set(CMAKE_REQUIRED_LIBRARIES ${stdfs_probe_save_libraries} "stdc++fs")
check_cxx_source_compiles("${stdfs_probe_code}" LIBCXX_FILESYSTEM_stdcxxfs)
if(LIBCXX_FILESYSTEM_stdcxxfs)
set(LIBCXX_FILESYSTEM "stdc++fs")
message(STATUS "Linking with ${LIBCXX_FILESYSTEM} is required for std::filesystem")
else()
set(CMAKE_REQUIRED_LIBRARIES ${stdfs_probe_save_libraries} "c++fs")
check_cxx_source_compiles("${stdfs_probe_code}" LIBCXX_FILESYSTEM_cxxfs)
if(LIBCXX_FILESYSTEM_cxxfs)
set(LIBCXX_FILESYSTEM "c++fs")
message(STATUS "Linking with ${LIBCXX_FILESYSTEM} is required for std::filesystem")
else()
set(CMAKE_REQUIRED_LIBRARIES ${stdfs_probe_save_libraries} "c++experimental")
check_cxx_source_compiles("${stdfs_probe_code}" LIBCXX_FILESYSTEM_cxxexperimental)
if(LIBCXX_FILESYSTEM_cxxexperimental)
set(LIBCXX_FILESYSTEM "c++experimental")
message(STATUS "Linking with ${LIBCXX_FILESYSTEM} is required for std::filesystem")
else()
message(STATUS "No support for std::filesystem")
endif()
endif()
endif()
endif()
set(CMAKE_REQUIRED_LINK_OPTIONS ${stdfs_probe_save_link_options})
set(CMAKE_REQUIRED_FLAGS ${stdfs_probe_save_flags})
set(CMAKE_REQUIRED_LIBRARIES ${stdfs_probe_save_libraries})
if(stdfs_probe_clear_cxx_standard)
unset(CMAKE_CXX_STANDARD)
endif()
unset(stdfs_probe_clear_cxx_standard)
unset(stdfs_probe_save_link_options)
unset(stdfs_probe_save_flags)
unset(stdfs_probe_flags)
unset(stdfs_probe_save_libraries)
unset(stdfs_probe_code)
unset(stdfs_probe_rc)
cmake_pop_check_state()
endif()
endif()
endmacro(probe_libcxx_filesystem)
cmake_policy(POP)
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