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

[Miles Lubin]

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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