Why Does CMake's `link_directories` Fail to Find My Library Despite Correct Path Specification?

CMake: Link_Directories Fails to Locate Library

Issue:

In a CMake-based project with a src and build directory, a library named "protobuf" cannot be found despite using the link_directories command.

Details:

• src/CMakeLists.txt includes a CMake configuration with link_directories pointing to "/usr/lib/x86_64-linux-gnu," the location of libprotobuf.so.
• The CMakeLists.txt also includes add_executable and target_link_libraries commands.
• main.cpp references functions from libprotobuf.so but encounters undefined reference errors at link time.
• Using the full path to libprotobuf.so in the target_link_libraries command instead of link_directories results in successful linking.

Solution:

Ensure that the link_directories command appears before not only target_link_libraries but also add_executable in the CMakeLists.txt file.

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