[Coin-lpsolver] Weird (compiler?) bug...

[John J Forrest]

Changed code so should be okay with g++ 3.3.4



Jeff Linderoth <jtl3 at lehigh.edu> 
Sent by: coin-lpsolver-admin at www-124.southbury.usf.ibm.com
09/24/2004 09:44 AM

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[Coin-lpsolver] Weird (compiler?) bug...






Hi All,

Is anyone else using g++ 3.3.4 with Clp? I just ran across a very, very,
strange bug that cost me a couple hours...

The ClpModel::maximumIterations() method was always returning 0. (?!)

In ClpModel::hitMaximumIterations(), the lines:

  std::cout << "Number iterations: " << numberIterations_ << std::endl;
  std::cout << "Function Max Iterations: " << maximumIterations() <<
std::endl;
  std::cout << "intParam_[0] = " << intParam_[ClpMaxNumIteration] <<
std::endl;
  std::cout << "intParam_[1] = " << intParam_[1] << std::endl;

Produced:

Number iterations: 17
Function Max Iterations: 0
intParam_[0] = 99999999
intParam_[1] = 9999999

It only happens when I tried to link Clp (and OsiClp) in with some other
libraries (MINTO, in particular)

Maybe an inlining problem(?) 

Just wanted to give a heads up or see if anyone had anyone had any
useful advice.

Cheers,
-Jeff



-- 
------------------------------------------------------------
Jeff Linderoth    O: 610-758-4879
Asst. Professor  
Industrial and Systems Engineering                    jtl3 at lehigh.edu
Lehigh University www.lehigh.edu/~jtl3 

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