[Coin-discuss] does CGL depend on CLP?

[Matthew Galati]

So... CGL does depend on CLP. Ok. Hopefully someone can fix that someday.


On Thu, 21 May 2009, Matthew Galati wrote:
>
> > I am trying to use CPLEX as my LP solver. Does CGL depend on CLP? if
> > so - why? CGL should be completely independent of any LP solver -
> > right?
>
> Yes and no... The end result is independent. However, some cut
> generators (e.g., CglLandP) depend on being able to perform low level
> tableau manipulation. Those methods are not available through OSI, so
> the cut generator uses an LP solver that does support these functions,
> and clp is a natural choice there. Actually, even if those methods
> would be available through OSI some LP solvers (like interior point)
> do not support them, so CGL would have to link with clp (or some LP
> solver that does support tableau methods) as a backup solution.
>
> Granted, the code could have been written with a bunch of ifdefs, but
> apparently that's not how it was done...
>
> --Laci
>
> >
> >
> > bla=;\
> >        for file in ATM_Main.o ATM_Instance.o ATM_DecompApp.o; do
> bla="$bla `echo $file`"; done; \
> >        g++ -Wl,--rpath -Wl,/home/magh/COIN/coin-Decomp/build/lib -O3
> -fomit-frame-pointer -pipe -DNDEBUG -pedantic-errors -Wimplicit
> -Wparentheses -Wreturn-type -Wcast-qual -Wall -Wpointer-arith
> -Wwrite-strings -Wconversion -Wno-unknown-pragmas   -o decomp_atm $bla
>  -L/home/magh/COIN/coin-Decomp/build/lib -lDecomp
> -L/usr/local/cplex/lib/x86_rhel4.0_3.4/static_pic -lcplex -lpthread -lm
>  -lAlps `cat
> /home/magh/COIN/coin-Decomp/build/Decomp/../Alps/alps_addlibs.txt` -lOsiCpx
> -lcplex -lOsiCpx -lcplex -L/home/magh/COIN/coin-Decomp/build/lib -lCgl -lOsi
> -lCoinUtils `cat
> /home/magh/COIN/coin-Decomp/build/Decomp/../Cgl/cgl_addlibs.txt` `cat
> /home/magh/COIN/coin-Decomp/build/Decomp/../Osi/osi_addlibs.txt` `cat
> /home/magh/COIN/coin-Decomp/build/Decomp/../CoinUtils/coinutils_addlibs.txt`
> > /home/magh/COIN/coin-Decomp/build/lib/libCgl.so: undefined reference to
> `typeinfo for OsiClpSolverInterface'
> > /home/magh/COIN/coin-Decomp/build/lib/libCgl.so: undefined reference to
> `OsiClpSolverInterface::getModelPtr() const'
> > /home/magh/COIN/coin-Decomp/build/lib/libCgl.so: undefined reference to
> `ClpSimplex::factorize()'
> > collect2: ld returned 1 exit status
> > make: *** [decomp_atm] Error 1
> >
>
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