为了使用C++17 <filesystem>,我写了类似下面的CMakeLists.txt文件。这是他们的一部分。
cmake_minimum_required(VERSION 3.14)
...
list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake")
include(functions)
include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
conan_basic_setup()
enable_cxx_compiler_flag_if_supported("-Wall")
enable_cxx_compiler_flag_if_supported("-pedantic")
...
set(Boost_USE_STATIC_LIBS ON)
set(Boost_USE_STATIC_RUNTIME ON)
find_package(Boost 1.65.1 COMPONENTS filesystem regex system thread)
if(Boost_FOUND)
add_executable(daemon
...)
target_compile_features(daemon PRIVATE cxx_std_17)
target_include_directories(daemon PRIVATE ...)
target_link_libraries(daemon ${Boost_LIBRARIES})
# OS specific instructions.
if(APPLE)
find_library(CoreFoundation CoreFoundation)
find_library(IOKit IOKit)
target_link_libraries(daemon ${CoreFoundation} ${IOKit})
elseif(WIN32)
# Windows developer environment specific instructions.
if(MINGW)
elseif(MSYS)
elseif(CYGWIN)
endif()
elseif(UNIX)
// The problem is here. Why Clang cannot find <filesystem>???
target_link_libraries(daemon c++fs dl)
else()
endif()
endif()我尝试过target_link_libraries(daemon stdc++fs dl)和set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -stdlib=libc++ -lc++abi"),但不起作用。
错误代码为
cmake --build .
[1/2] Building CXX object CMakeFiles/daemon.dir/src/thread/serial_manager.cpp.o
FAILED: CMakeFiles/daemon.dir/src/thread/serial_manager.cpp.o
/usr/bin/clang++ -I/home/koriel/.conan/data/boost/1.65.1/conan/stable/package/f410c60ac3ae66f96115aab74b1c5fbc1a6a4a45/include -I/home/koriel/.conan/data/bzip2/1.0.6/conan/stable/package/abc45b7dce3f5194dea2377c33229fa4f20706b4/include -I/home/koriel/.conan/data/zlib/1.2.11/conan/stable/package/abc45b7dce3f5194dea2377c33229fa4f20706b4/include -I../include/json -I../include/queue -I../src/base64 -I../src/message -I../src/serial -I../src/thread -Wall -pedantic -DBOOST_USE_STATIC_LIBS -std=gnu++17 -MD -MT CMakeFiles/daemon.dir/src/thread/serial_manager.cpp.o -MF CMakeFiles/daemon.dir/src/thread/serial_manager.cpp.o.d -o CMakeFiles/daemon.dir/src/thread/serial_manager.cpp.o -c ../src/thread/serial_manager.cpp
../src/thread/serial_manager.cpp:43:10: fatal error: 'filesystem' file not found
#include <filesystem>
^~~~~~~~~~~~
1 error generated.
ninja: build stopped: subcommand failed.发布于 2019-04-18 17:26:43
尽管official libc++ 7中包含了<filesystem>,但许多发行版都不包含它。
我刚刚看了一下Xcode10.2(它也附带了libc++ 7),我遇到了同样的问题:安装中缺少filesystem头文件。
你可以看看你的libc++安装,它应该在Ubuntu系统的/usr中的某个地方(如果你不知道确切的位置,只需要运行find /usr -name cstdint,这会指向你的位置)。如果在该文件夹中找不到filesystem头文件,您可以使用boost::filesystem或尽快安装clang8。
https://stackoverflow.com/questions/55739773
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