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mdbx-cmake: rework linking detection for std::filesystem.

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This commit is contained in:
Леонид Юрьев (Leonid Yuriev)
2022-04-07 21:57:49 +03:00
parent 39a4a89650
commit 5ebcb90620
4 changed files with 118 additions and 22 deletions
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116
cmake/compiler.cmake
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@@ -826,24 +826,106 @@ macro(setup_compile_flags)
unset(MODULE_LINKER_FLAGS)
endmacro(setup_compile_flags)
if(CMAKE_CXX_COMPILER_LOADED)
# determine library for std::filesystem
set(LIBCXX_FILESYSTEM "")
if(CMAKE_COMPILER_IS_ELBRUSCXX)
if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 1.26.0)
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")
elseif(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9.0)
set(LIBCXX_FILESYSTEM "stdc++fs")
endif()
elseif(CMAKE_COMPILER_IS_GNUCXX AND NOT MINGW)
if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.3 AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9.0)
set(LIBCXX_FILESYSTEM "stdc++fs")
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)
include(CMakePushCheckState)
include(CheckCXXSourceCompiles)
cmake_push_check_state()
set(stdfs_probe_save_libraries ${CMAKE_REQUIRED_LIBRARIES})
unset(stdfs_probe_clear_cxx_standard)
if(NOT DEFINED CMAKE_CXX_STANDARD)
list(FIND CMAKE_CXX_COMPILE_FEATURES cxx_std_14 HAS_CXX14)
list(FIND CMAKE_CXX_COMPILE_FEATURES cxx_std_17 HAS_CXX17)
if(NOT HAS_CXX17 LESS 0
AND NOT (CMAKE_COMPILER_IS_CLANG AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5))
set(CMAKE_CXX_STANDARD 17)
elseif(NOT HAS_CXX14 LESS 0)
set(CMAKE_CXX_STANDARD 14)
else()
set(CMAKE_CXX_STANDARD 11)
endif()
set(stdfs_probe_clear_cxx_standard ON)
endif()
set(stdfs_probe_code [[
#if defined(__SIZEOF_INT128__) && !defined(__GLIBCXX_TYPE_INT_N_0) && defined(__clang__) && __clang_major__ < 4
#define __GLIBCXX_BITSIZE_INT_N_0 128
#define __GLIBCXX_TYPE_INT_N_0 __int128
#endif
#ifndef __has_include
#define __has_include(header) (0)
#endif
#if __has_include(<version>)
#include <version>
#endif
#include <cstdlib>
#include <string>
#if defined(__cpp_lib_string_view) && __cpp_lib_string_view >= 201606L
#include <string_view>
#endif
#if defined(__cpp_lib_filesystem) && __cpp_lib_filesystem >= 201703L
#include <filesystem>
#else
#include <experimental/filesystem>
#endif
#if (defined(__cpp_lib_filesystem) && __cpp_lib_filesystem >= 201703L && (!defined(__MAC_OS_X_VERSION_MIN_REQUIRED) || __MAC_OS_X_VERSION_MIN_REQUIRED >= 101500) && (!defined(__IPHONE_OS_VERSION_MIN_REQUIRED) || __IPHONE_OS_VERSION_MIN_REQUIRED >= 130100))
namespace fs = ::std::filesystem;
#elif defined(__cpp_lib_experimental_filesystem) && __cpp_lib_experimental_filesystem >= 201406L
namespace fs = ::std::experimental::filesystem;
#endif
int main(int argc, const char*argv[]) {
fs::path probe(argv[0]);
if (argc != 1) throw fs::filesystem_error(std::string("fake"), std::error_code());
return fs::is_directory(probe.relative_path());
}
]])
set(LIBCXX_FILESYSTEM "")
check_cxx_source_compiles("${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_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_libraries)
unset(stdfs_probe_code)
unset(stdfs_probe_rc)
cmake_pop_check_state()
endif()
endif()
endif()
endmacro(probe_libcxx_filesystem)
cmake_policy(POP)