CODEWITHSUNDEEP
c++cmakelinker
salbeira
salbeira

Reputation: 2611

CMake VisualStudio can not find library

For the final step of creating the executable for my multimedia project I have something like this in one of my CMakeFiles.txt

add_executable(project a.cpp a.h)

if(WIN32)
    link_directories(${PROJECT_SOURCE_DIR}/lib/win)
    target_link_libraries(project opengl32 glfw3dll OpenAL32 alut ogg vorbis vorbisenc vorbisfile)
else()
    link_directories(${PROJECT_SOURCE_DIR}/lib/linux)
    target_link_libraries(project gl glfw3 openal alut vorbis ogg vorbisenc vorbisfile)
endif()

Inside the /lib/win directory are all the libraries I want to link to.

But every time tell cmake to build the project I get an error reading:

Error   LNK1104 cannot open file 'glfw3dll.lib' C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\CMakeLists.txt    C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\LINK  1

(Yes the file generated by the CMake Project of glfw is called "glfw3dll.lib")

I can hardlink against each library using:

target_link_libraries(project ${PROJECT_SOURCE_DIR}/lib/win/glfw3dll.lib)

for every single library but I guess CMake was not made to have me write all this ...

Also of course the corresponding libraries need to be copied to the final build and install directory to deploy the software. How do I tell CMake to do that?

Upvotes: 1

Views: 1759

Answers (1)

Matthieu Brucher
Matthieu Brucher

Reputation: 22023

The proper way to do this is to use FindLibrary first:

 find_library (glfw3dll_LIBRARY NAMES glfw3dll PATHS ${PROJECT_SOURCE_DIR}/lib/win)

And then use it:

target_link_libraries(project ${glfw3dll_LIBRARY})

This has a few advantages:

  • You know at CMake run time if the library was properly found,
  • As you have a variable, all the tests for platform are relegated to the set up, when you find all libraries.

Upvotes: 1

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