[Coin-lpsolver] g++ seg. fault compiling Clp

[Kish Shen]

Hi,

I downloaded various COIN-OR components last week, from the 28 July 2005
tarballs. I was able to compile the components with g++ 3.2.2 (on Linux),
but unfortunately I am unable to run this on most of our Linux machines on
our network, which have older versions of Linux (missing libraries, etc.).

I then tried to compile COIN-OR on this older Linux:

worm: g++ -v
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs
gcc version 2.96 20000731 (Red Hat Linux 7.3 2.96-113)
worm: uname -a
Linux worm.icparc.ic.ac.uk 2.4.18-18.7.X-perfctr #2 Tue Dec 10 12:15:10 GMT 2002 i686 unknown

which should have a sufficiently recent g++, according to the INSTALL.
However, I ran into several problems, some of which I was able to work
around, but on trying to compile Clp, I got a segmentation error, with the
following message:

Compiling ClpSimplexNonlinear.cpp
ClpSimplexNonlinear.cpp: In method `int 
ClpSimplexNonlinear::pivotColumn (CoinIndexedVector *, 
CoinIndexedVector *, CoinIndexedVector *, CoinIndexedVector *, int &, 
double &, double *)':
ClpSimplexNonlinear.cpp:2366: Internal error: Segmentation fault.
Please submit a full bug report.
See <URL:http://bugzilla.redhat.com/bugzilla/> for instructions.
make[2]: *** [Linux-O/ClpSimplexNonlinear.o] Error 2

Thinking this is a g++ problem, I then tried to simplify the code in
ClpSimplexNonlinear.cpp, and the following seem to be the minimal code that
will generate a seg fault:

int 
ClpSimplexNonlinear::pivotColumn(CoinIndexedVector * longArray,
				 CoinIndexedVector * rowArray,
				 CoinIndexedVector * columnArray,
				 CoinIndexedVector * spare,
				 int & pivotMode,
				 double & solutionError,
				 double * dArray)
{
  // say not optimal
  
    int numberTotal = numberRows_+numberColumns_; 
  // big big loop
    double * work=0;
    
	memcpy(dArray,work,numberTotal*sizeof(double));
      

	int nFlagged=0;
	for (;;) {
	    switch(getStatus(0)) {
	      
	    case basic:
	    case ClpSimplex::isFixed:
	      break;
	    case atUpperBound:
	    case atLowerBound:
	      if (dj_[0]) 
		nFlagged++;
	      break;
	    }
	    
	}
	
}

I get a different error message in this case:

Compiling ClpSimplexNonlinear.cpp
include/ClpModel.hpp: In method `int ClpSimplexNonlinear::pivotColumn 
(CoinIndexedVector *, CoinIndexedVector *, CoinIndexedVector *, 
CoinIndexedVector *, int &, double &, double *)':
include/ClpModel.hpp:864: Internal error: Segmentation fault.

and line 864 of ClpModel.hpp is:

  std::vector<std::string> rowNames_;

Any ideas how I can work around this?

On a slightly different topic: is there some way I can find out the Clp
version from the source files? I was trying to find it so that I can report
the version of Clp I am using.

Thanks in advance for any information/help!


Yours sincerely,

Kish Shen