C + + Boost: 对 Boost: : system: : general_Category()的未定义引用

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最佳答案

You should link in the libboost_system library. I am not sure about codeblocks, but the g++ command-line option on your platform would be

-lboost_system

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Depending on the boost version libboost-system comes with the -mt suffix which should indicate the libraries multithreading capability.

So if -lboost_system cannot be found by the linker try -lboost_system-mt.

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You could come across another problem. After installing Boost on the Linux Mint I've had the same problem. Linking -lboost_system or -lboost_system-mt haven't worked because library have had name libboost_system.so.1.54.0.

So the solution is to create symbolic link to the original file. In my case

sudo ln -s /usr/lib/x86_64-linux-gnu/libboost_system.so.1.54.0 /usr/lib/libboost_system.so

For more information see this question.

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It's a linker problem. Include the static library path into your project.

For Qt Creator open the project file .pro and add the following line:

LIBS += -L<path for boost libraries in the system> -lboost_system

In my case Ubuntu x86_64:

LIBS += -L/usr/lib/x86_64-linux-gnu -lboost_system

For Codeblocks, open up Settings->Compiler...->Linker settings tab and add:

boost_system

to the Link libraries text widget and press OK button.

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try

g++ -c main.cpp && g++ main.o /usr/lib/x86_64-linux-gnu/libboost_system.so && ./a.out

/usr/lib/x86_64-linux-gnu/ is the location of the boost library

use find /usr/ -name '*boost*.so' to find the boost library location

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I had the same problem and also use Linux Mint (as nuduoz) . I my case problem was solved after i added boost_system to GCC C++ Linker->Libraries.

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I searched for a solution as well, and none of the answers I encountered solved the error, Until I found the answer of "ViRuSTriNiTy" to this thread: Undefined reference to 'boost::system::generic_category()'?

according to that answer, try to add these lines to your cmake file:

find_package(Boost 1.55.0 REQUIRED COMPONENTS system filesystem)
include_directories(... ${Boost_INCLUDE_DIRS})
link_directories(... ${Boost_LIBRARY_DIRS})
target_link_libraries(... ${Boost_LIBRARIES})

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Same problem on building a simple boost example, solved after i changed the g++ compiler flag from -std=c++14 to -std=c++11.

And I noticed that it's a C++11 Example...

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g++ -lboost_system -lboost_filesystem userentry.cpp -o userentry

worked perfectly under debian. (boost c++ libraries installed with apt-get).

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Il the library is not installed you should give boost libraries folder:

example:

g++ -L/usr/lib/x86_64-linux-gnu -lboost_system -lboost_filesystem prog.cpp -o prog

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This answer actually helped when using Boost and cmake.

Adding add_definitions(-DBOOST_ERROR_CODE_HEADER_ONLY) for cmake file.

My CMakeLists.txt looks like this:

cmake_minimum_required(VERSION 3.12)
project(proj)


set(CMAKE_CXX_STANDARD 17)




set(SHARED_DIR "${CMAKE_SOURCE_DIR}/../shared")


set(BOOST_LATEST_DIR            "${SHARED_DIR}/boost_1_68_0")
set(BOOST_LATEST_BIN_DIR        "${BOOST_LATEST_DIR}/stage/lib")
set(BOOST_LATEST_INCLUDE_DIR    "${BOOST_LATEST_DIR}/boost")
set(BOOST_SYSTEM                "${BOOST_LATEST_BIN_DIR}/libboost_system.so")
set(BOOST_FS                    "${BOOST_LATEST_BIN_DIR}/libboost_filesystem.so")
set(BOOST_THREAD                "${BOOST_LATEST_BIN_DIR}/libboost_thread.so")


set(HYRISE_SQL_PARSER_DIR           "${SHARED_DIR}/hyrise_sql_parser")
set(HYRISE_SQL_PARSER_BIN_DIR       "${HYRISE_SQL_PARSER_DIR}")
set(HYRISE_SQL_PARSER_INCLUDE_DIR   "${HYRISE_SQL_PARSER_DIR}/src")
set(HYRISE_SQLPARSER                "${HYRISE_SQL_PARSER_BIN_DIR}/libsqlparser.so")




include_directories(${CMAKE_SOURCE_DIR} ${BOOST_LATEST_INCLUDE_DIR} ${HYRISE_SQL_PARSER_INCLUDE_DIR})


set(BOOST_LIBRARYDIR "/usr/lib/x86_64-linux-gnu/")
set(Boost_USE_STATIC_LIBS OFF)
set(Boost_USE_MULTITHREADED ON)
set(Boost_USE_STATIC_RUNTIME OFF)


add_definitions(-DBOOST_ERROR_CODE_HEADER_ONLY)


find_package(Boost 1.68.0 REQUIRED COMPONENTS system thread filesystem)


add_executable(proj main.cpp row/row.cpp row/row.h table/table.cpp table/table.h page/page.cpp page/page.h
processor/processor.cpp processor/processor.h engine_instance.cpp engine_instance.h utils.h
meta_command.h terminal/terminal.cpp terminal/terminal.h)




if(Boost_FOUND)
include_directories(${Boost_INCLUDE_DIRS})
target_link_libraries(proj PUBLIC Boost::system Boost::filesystem Boost::thread ${HYRISE_SQLPARSER})
endif()

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After testing the proposed solutions described above, I found only these few of lines would work.

I am using Ubuntu 16.04.

cmake_minimum_required(VERSION 3.13)
project(myProject)


set(CMAKE_CXX_STANDARD 11)
add_executable(myProject main.cpp)


find_package(Boost 1.58.0 REQUIRED COMPONENTS system filesystem)
target_link_libraries(myProject ${Boost_LIBRARIES})

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In my project I prefer to use header-only libraries. So nothing above was helpful. What did really help is:

add_definitions(-DBOOST_SYSTEM_NO_DEPRECATED)