[Coin-discuss] does CGL depend on CLP?

[John J Forrest]

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


                                                                                                                
  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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