CODEWITHSUNDEEP
c++cmakelinker
Jodo
Jodo

Reputation: 4763

CMake: build lib and link it to executable results in undefined reference error

I have a cmake setup that is supposed to first build a library and then use this library to create an executable:

# build and install the project lib
add_library(lib${PROJECT_NAME} 
    test.cpp
)
install(TARGETS lib${PROJECT_NAME} DESTINATION ${INSTALL_DIR})
install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/ DESTINATION ${INSTALL_INCLUDE_DIR} FILES_MATCHING PATTERN "*.h*")


# link lib and create executable
add_executable(${PROJECT_NAME} main.cpp)
target_link_libraries(lib${PROJECT_NAME})

install(TARGETS ${PROJECT_NAME} DESTINATION ${INSTALL_DIR})

The lib building part works, but it seems the linking of the lib does not. I am using a simple add method which is implemented in the test.cpp and I get an undefined reference to this method.

What am I missing here?

Upvotes: 0

Views: 108

Answers (1)

vre
vre

Reputation: 6714

The first argument to a target_link_libraries call has to be the name of the target the library should be linked to, i.e. ${PROJECT_NAME} in your case, the second argument is the library target. See documentation for target_link_libraries.

In your example you need to use: target_link_libraries(${PROJECT_NAME} lib${PROJECT_NAME})

Upvotes: 1

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