Undefined reference to `Ipopt::IpoptApplication::IpoptApplication(bool, bool)' about cppad

[bradbell]

It appears that you are not including the ipopt library on your in the command that is creating the executable. It might help to run a simple ipopt example, that does not is CppAD, to ensure it is properly installed and the linking works.

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I am completely new to cppad and I apologize if this is a stupid question. I have been trying to install cppad and ipopt for a day now and it's getting really frustrating as I don't know how to solve this problem. I am trying to use Cppad in my program but I run into the error: In function `void CppAD::ipopt::solve<CppAD::vector<double>, (anonymous namespace)::FG_eval>(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, CppAD::vector<double> const&,CppAD::vector<double> const&, CppAD::vector<double> const&, CppAD::vector<double> const&, CppAD::vector<double> const&, (anonymous namespace)::FG_eval&, CppAD::ipopt::solve_result<CppAD::vector<double> >&)': ipopt_test.cpp:(.text+0xe0a): undefined reference to `Ipopt::IpoptApplication::IpoptApplication(bool, bool)' collect2: error: ld returned 1 exit status I can't find many resources online of people having the same problem. To check if it is my program I tried running the following [example]( https://www.coin-or.org/CppAD/Doc/ipopt_nlp_get_started.cpp.htm) but I get the same error. Wondering if you guys know about it -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: #39

[bradbell]

Please close this issue if the answer above solved this problem.

[lxjlu]

I also have the same question. How do you solve it in the end? Thanks!

[Jackhe96]

@lxjlu It was my fault, I was using ROS and the cmakelists.txt file was not configured correctly

[lxjlu]

@lxjlu It was my fault, I was using ROS and the cmakelists.txt file was not configured correctly

I also used it for the first time, and I understand whether it is a problem in the link section. I am directly g++ -o example example.cpp. Is there any problem, thank you.

[bradbell]

I assume you are using Ipopt and have installed it.

If on your cmake command line you choose cmake_verbose_makefile eqaul to YES
https://coin-or.github.io/CppAD/doc/cmake.htm#cmake_verbose_makefile

and you also specify ipopt_prefix
https://coin-or.github.io/CppAD/doc/cmake.htm#package_prefix

then during the make check
https://coin-or.github.io/CppAD/doc/cmake.htm#make%20check

you should see how CppAD links in ipopt.

[lxjlu]

I assume you are using Ipopt and have installed it.

If on your cmake command line you choose cmake_verbose_makefile eqaul to YES
https://coin-or.github.io/CppAD/doc/cmake.htm#cmake_verbose_makefile

and you also specify ipopt_prefix
https://coin-or.github.io/CppAD/doc/cmake.htm#package_prefix

then during the make check
https://coin-or.github.io/CppAD/doc/cmake.htm#make%20check

you should see how CppAD links in ipopt.

Thanks, I will check it carefully.

[bradbell]

It will be easier to see if you only check to ipopt_solve examples; i.e., use
make check_example_ipopt_solve

[tu-trinh]

@Jackhe96 Hi, I'm running into the exact same error. How did you fix your cmakelists.txt?
I just freshly installed ipopt and #included cppad/ipopt/solve.hpp as well as Interfaces/IpIpoptApplication.hpp and using Ipopt::IpoptApplication, which I believe is where IpoptApplication comes from.

[bradbell]

@tu-trinh By the exact same error do you mean ?

undefined reference to Ipopt::IpoptApplication::IpoptApplication(bool, bool)'
collect2: error: ld returned 1 exit status

[DanielrdMorais]

I have the same problem:
undefined reference to `Ipopt::IpoptApplication::IpoptApplication(bool, bool)'
collect2: error: ld returned 1 exit status