CODEWITHSUNDEEP
cgcccmake
andyinno
andyinno

Reputation: 1061

CMake subdir library and main project

This is an example, I googled a lot for this today but I cannot find a good way for have this thing done.

For example I followed what's written in this link: http://mirkokiefer.com/blog/2013/03/cmake-by-example/

I have 

/Build
/Src
 => main.c
  /Lib
      => File.c
      => File.h

I have a CMakeLists.txt in the Src dir

SET(SOURCES
    main.c
)
add_subdirectory(Lib)
ADD_EXECUTABLE(${PROJECT_NAME} ${SOURCES})
TARGET_LINK_LIBRARIES(${PROJECT_NAME} lib)

and in the Lib dir:

set(LibSrc
    File.c
)
set(LibHead
    File.h
)
add_library(lib STATIC ${LibSrc} ${LibHead})
target_include_directories(lib PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})

When I compile the project everything compile corretly, but when the gcc links the library with the rest of the project I receive an error like:

main.cpp:(.text+0x10): undefined reference to `test()`

It is driving me crazy... Any hints on where I'm doing it wrong? Thank you

Upvotes: 1

Views: 106

Answers (1)

Fraser
Fraser

Reputation: 78468

It looks like your target_link_libraries command is missing the list of dependencies. I guess in your case, you just want to link "lib", so you need to change this to:

target_link_libraries(${PROJECT_NAME} lib)

As an aside, you're missing a $ before {CMAKE_CURRENT_SOURCE_DIR} in the line

target_include_directories(lib PUBLIC {CMAKE_CURRENT_SOURCE_DIR})

Upvotes: 2

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