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g++のboostで-lboost_program_optionsオプションつけたのにundefined reference

Posted at

問題

$ sudo apt-get install libboost-all-dev

をして

$ g++ -lboost_program_options -lboost_filesystem  main.cpp

を実行すると

main.cpp:(.text+0x48): undefined reference to `boost::program_options::operator<<(std::ostream&, boost::program_options::options_description const&)'

のようなエラーがずらっと出てくる

解決

-lboost_program_options -lboost_filesystemは必ず最後に指定する必要がある.
つまり

$ g++ main.cpp -lboost_program_options -lboost_filesystem 

の形式で実行する必要がある.

参考文献

C++ Boostによるコマンドライン引数処理

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