[Clp] Error when building project with CLP using C++ and XCode.

[Victor Zverovich]

Thanks, I think I saw this. I meant comparison to a low-level solver API
without a modeling layer even rudimentary one like the C++ Gurobi API which
might add substantial overhead if you only count problem building time.

- Victor

On Sat, May 7, 2016 at 1:11 PM Miles Lubin <miles.lubin at gmail.com> wrote:

> Hi Victor,
>
> We have benchmarks comparing model construction in JuMP versus the Gurobi
> C++ API, described at http://arxiv.org/abs/1508.01982 with code at
> https://github.com/mlubin/JuMPSupplement. We haven't put together
> benchmarks on column generation since these would have a quite smaller
> target audience, but I'll be interested to see if Jesse is able to report
> any comparisons.
>
> Best,
> Miles
>
> On Sat, May 7, 2016 at 4:03 PM, Victor Zverovich <
> victor.zverovich at gmail.com> wrote:
>
>> Hi Miles,
>>
>> Do you have a benchmark comparing problem construction time using Clp C++
>> API vs JuMP or similar?
>>
>> - Victor
>>
>> On Sat, May 7, 2016 at 12:10 PM Miles Lubin <miles.lubin at gmail.com>
>> wrote:
>>
>>> Hi Jesse,
>>>
>>> Why do you feel that model building in C++ would be faster than JuMP?
>>> JuMP supports column generation and passes data directly to the in-memory
>>> Clp representation of the problem.
>>>
>>> Miles
>>>
>>> On Sat, May 7, 2016 at 9:20 AM, Jesse Jaanila <jessejaanila at gmail.com>
>>> wrote:
>>>
>>>> Hi!
>>>>
>>>> I've had success using CLP via Julia JuMP API, but now i'm trying to
>>>> use C++ for faster model building (column generation scheme).
>>>>
>>>> I'm on Mac OS X El Capitan with newest XCode and command line tools. I
>>>> built CLP 1.16 as described on
>>>> https://projects.coin-or.org/Clp with make, make test and make
>>>> install. Everything went fine and installation was successful.
>>>>
>>>> I am trying to build one of the examples; specifically
>>>> https://projects.coin-or.org/Clp/browser/trunk/Clp/examples/addColumns.cpp
>>>> to fiddle around with the C++ API.
>>>>
>>>> I set up search paths for header files and libraries (see picture link)
>>>> for my project.
>>>>
>>>> https://i.imgur.com/FdSdNNR.png
>>>>
>>>> This got away error "ClpSimplex.hpp file not found". So I was really
>>>> hopeful that that is all the configurating I need to do.
>>>>
>>>> But still my build fails. My error log is (main.cpp is my project file
>>>> name):
>>>>
>>>> *Undefined symbols for architecture x86_64:*
>>>>
>>>>   "ClpSimplex::loadProblem(CoinModel&, bool)", referenced from:
>>>>
>>>>       _main in main.o
>>>>
>>>>   "ClpSimplex::setRowLower(int, double)", referenced from:
>>>>
>>>>       _main in main.o
>>>>
>>>>   "ClpSimplex::setRowUpper(int, double)", referenced from:
>>>>
>>>>       _main in main.o
>>>>
>>>>   "ClpSimplex::initialSolve()", referenced from:
>>>>
>>>>       _main in main.o
>>>>
>>>>   "ClpSimplex::allSlackBasis(bool)", referenced from:
>>>>
>>>>       _main in main.o
>>>>
>>>>   "ClpSimplex::dual(int, int)", referenced from:
>>>>
>>>>       _main in main.o
>>>>
>>>>   "ClpSimplex::resize(int, int)", referenced from:
>>>>
>>>>       _main in main.o
>>>>
>>>>   "ClpSimplex::readMps(char const*, bool, bool)", referenced from:
>>>>
>>>>       _main in main.o
>>>>
>>>>   "ClpSimplex::ClpSimplex(ClpSimplex const&, int)", referenced from:
>>>>
>>>>       _main in main.o
>>>>
>>>>   "ClpSimplex::ClpSimplex(bool)", referenced from:
>>>>
>>>>       _main in main.o
>>>>
>>>>   "ClpSimplex::~ClpSimplex()", referenced from:
>>>>
>>>>       _main in main.o
>>>>
>>>>   "ClpSimplex::operator=(ClpSimplex const&)", referenced from:
>>>>
>>>>       _main in main.o
>>>>
>>>>   "ClpModel::addColumns(CoinModel&, bool, bool)", referenced from:
>>>>
>>>>       _main in main.o
>>>>
>>>>   "ClpModel::addColumns(CoinBuild const&, bool, bool)", referenced from:
>>>>
>>>>       _main in main.o
>>>>
>>>>   "ClpModel::deleteColumns(int, int const*)", referenced from:
>>>>
>>>>       _main in main.o
>>>>
>>>>   "ClpModel::addRows(int, double const*, double const*,
>>>> CoinPackedVectorBase const* const*)", referenced from:
>>>>
>>>>       _main in main.o
>>>>
>>>>   "ClpModel::addColumn(int, int const*, double const*, double, double,
>>>> double)", referenced from:
>>>>
>>>>       _main in main.o
>>>>
>>>>   "CoinBuild::addColumn(int, int const*, double const*, double, double,
>>>> double)", referenced from:
>>>>
>>>>       _main in main.o
>>>>
>>>>   "CoinBuild::CoinBuild()", referenced from:
>>>>
>>>>       _main in main.o
>>>>
>>>>   "CoinBuild::~CoinBuild()", referenced from:
>>>>
>>>>       _main in main.o
>>>>
>>>>   "CoinModel::setRowBounds(int, double, double)", referenced from:
>>>>
>>>>       _main in main.o
>>>>
>>>>   "CoinModel::addColumn(int, int const*, double const*, double, double,
>>>> double, char const*, bool)", referenced from:
>>>>
>>>>       _main in main.o
>>>>
>>>>   "CoinModel::CoinModel()", referenced from:
>>>>
>>>>       _main in main.o
>>>>
>>>>   "CoinModel::~CoinModel()", referenced from:
>>>>
>>>>       _main in main.o
>>>>
>>>> ld: symbol(s) not found for architecture x86_64
>>>>
>>>> *clang: error: linker command failed with exit code 1 (use -v to see
>>>> invocation)*
>>>>
>>>> Sadly i'm still quite new to C++ so I haven't been able to pinpoint
>>>> what the problem is. Could it be something trivial? Do I need something
>>>> else when building C++ project with CLP other than search setup for
>>>> Header/Library paths? Maybe someone else has had similar problem with mac
>>>> os x & XCode.
>>>>
>>>> Any ideas are helpful! Cheers,
>>>>
>>>> Jesse
>>>>
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>>>>
>>>>
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