CODEWITHSUNDEEP
c++boostcmake
seeekr
seeekr

Reputation: 101

CMake Boost linker error

I'm trying to build a C++ executable that uses a Boost library. Building with CMake.

CMake snippet:

find_package(Boost REQUIRED system)
include_directories(${Boost_INCLUDE_DIRS})
add_executable(main src/cpp/main.cpp)
target_link_libraries(main ${BOOST_LIBRARIES})

Getting following CMake build error message:

Undefined symbols for architecture x86_64:
  "boost::system::system_category()", referenced from:
...

Why am I getting the error and how can I fix it?

Upvotes: 3

Views: 1605

Answers (2)

rocambille
rocambille

Reputation: 15996

To complete seeekr's answer, you should consider using imported target instead of Boost_ variables:

find_package(Boost REQUIRED system)
add_executable(main ...)
target_link_libraries(main Boost::system)

The imported target will handle linkage, include directories, compile definitions, and all needed stuff with a single call.

Upvotes: 3

seeekr
seeekr

Reputation: 101

The variables created by the find_package(Boost ...) call you are using are case sensitive, i.e.

${BOOST_LIBRARIES}

will be empty and you need to make sure you are using it like this:

${Boost_LIBRARIES}

The same goes for Boost_INCLUDES which you have used (read: copy-pasted) correctly here:

include_directories(${Boost_INCLUDE_DIRS})

Upvotes: 3

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