How Can I Redirect CMake Build Outputs to a Separate 'bin' Directory?

Redirecting CMake Build Outputs to a 'bin' Directory

When building projects with plugins using CMake, the compiled binaries and libraries are typically scattered within the source directory structure. To organize these files, it becomes necessary to direct CMake's output to a separate directory, such as './bin'.

The solution lies in setting the appropriate CMake variable to specify the desired output path. Following Oleg's advice, the correct variable to modify is CMAKE_RUNTIME_OUTPUT_DIRECTORY.

In the root CMakeLists.txt file, you can specify the output directory as follows:

set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

This will set the output directories for archives, libraries, and runtime binaries to a 'lib' subdirectory and a 'bin' subdirectory within the binary directory.

Alternatively, you can specify the output directories on a per-target basis using the set_target_properties command:

set_target_properties(targets...
    PROPERTIES
    ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib"
    LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib"
    RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin"
)

This approach allows you to specify different output directories for different targets, providing finer-grained control over the build process.

In both cases, you can append '_[CONFIG]' to the variable or property name to set the output directory for a specific configuration. The standard configuration values are DEBUG, RELEASE, MINSIZEREL, and RELWITHDEBINFO.

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