c++ - Cmake external library .a -


i have external library here:

${project_source_dir}/thirdparty/yaml-cpp/

it made makefile: thirdparty/makefile. executing makefile so:

add_custom_target(    yaml-cpp    command make    working_directory ${cmake_source_dir}/thirdparty )

i attempting link library, builds thirdparty/yaml-cpp/build/libyaml-cpp.a. this part not working:

target_link_libraries(load_balancer_node ${cmake_source_dir}/thirdparty/yaml-cpp/build/libyaml-cpp.a)

i error:

  target "yaml-cpp" of type utility may not linked target.   1 may link static or shared libraries, or executables   enable_exports property set.

how execute makefile , link .a file?

so makes sense cmake can't figure out dependencies here: have parse makefile , find output. have tell output someone. nearest can figure, best way use custom_command rather custom target:

add_custom_command(     output ${cmake_source_dir}/thirdparty/yaml-cpp/build/libyaml-cpp.a     command make     working_directory ${cmake_source_dir}/thirdparty)  add_custom_target(    yaml-cpp    depends ${cmake_source_dir}/thirdparty/yaml-cpp/build/libyaml-cpp.a)  ...  add_dependencies(load_balancer_node yaml-cpp)  target_link_libraries(load_balancer_node ${cmake_source_dir}/thirdparty/yaml-cpp/build/libyaml-cpp.a)

i having linker troubles though (stupid windows machine), cmake worked , made libraries before trying link.


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