Why Does CMake Fail to Find My Library Despite Using `link_directories`?

CMake Cannot Locate Library Despite Using ""link_directories"

In your CMake configuration, you specified the directory containing the shared library with link_directories(/usr/lib/x86_64-linux-gnu). However, the linker reported undefined references to functions in the protobuf library.

The key to resolving this issue lies in the ordering of your CMake commands. Ensure that link_directories is called before add_executable:

link_directories(/usr/lib/x86_64-linux-gnu)
add_executable(test main.cpp)

By adjusting the order, CMake will correctly locate the library and link it to your executable.

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