[Coin-discuss] does CGL depend on CLP?

[Pierre Bonami]

Matt,
I updated makefiles in trunk so that nothing of CglLandP should be compiled
if COIN_HAS_CLP is not true (I don't have writting permissions for the
latest stable but modifications will come next time stable is updated). It
should fix your linking problem, and remove the dependance (except if you
would want to use lift-and-project cuts of course...).
Best,
Pierre

On Fri, May 22, 2009 at 9:01 AM, John J Forrest <jjforre at us.ibm.com> wrote:

> Matt,
>
> As the owner of Clp I plead innocent. If you look at code you will see that
> only CglLAndP uses Clp. Other cut generators which use tableau e.g.
> CglGomory use Coin code to do factorization.
>
> It would probably only be an hours work to use #ifdef COIN_HAS_CLP to dummy
> out CglLandP. However it might be better to get the opinion of Pierre Bonami
> as I also notice #ifdef COIN_HAS_CPX and #ifdef COIN_HAS_XPR in the
> CglLandPSimplex code.
>
> John
>
> [image: Inactive hide details for Matthew Galati ---05/21/2009 09:59:14
> PM---So... CGL does depend on CLP. Ok. Hopefully someone can fi]Matthew
> Galati ---05/21/2009 09:59:14 PM---So... CGL does depend on CLP. Ok.
> Hopefully someone can fix that someday.
>
>
> From:
> Matthew Galati <magh at lehigh.edu>
> To:
> ladanyi at watson.ibm.com
> Cc:
> "coin-discuss at list.coin-or.org" <coin-discuss at list.coin-or.org>, Matthew
> Galati <Matthew.Galati at sas.com>
> Date:
> 05/21/2009 09:59 PM
> Subject:
> Re: [Coin-discuss] does CGL depend on CLP?
> ------------------------------
>
>
>
> 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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