index reduction method causes segmentation fault

[Lennart Ochel]

The following script

loadString("
package otherTests
  model pendulum4
    parameter Real g=9.81;
    parameter Real L=0.5;
    parameter Real m=1;
    Real x;
    Real y;
    Real vx;
    Real vy;
    Real F;
  initial equation
    y = 0.0;
    der(y) = 0.0;
  equation
    vx = der(x);
    vy = der(y);
    m*der(vx) = -x/L*F;
    m*der(vy) = -y/L*F-m*g;
    x^2+y^2=L^2;
  end pendulum4;
end otherTests;
"); getErrorString();

setIndexReductionMethod("dummyDerivative"); getErrorString();
simulate(otherTests.pendulum4, startTime=0.0, stopTime=5.0); getErrorString();

produces the following output

true
""
true
""
Segmentation fault (core dumped)

for the test-file, see testsuite/simulation/modelica/others/pendulum4.mos

[Jens Frenkel]

This is because the old Index Reduktion does not work in combination with the new Matching Algorithms. Use setMatchingAlgorithm("omc");

The old index reduction will be delete soon.

[Lennart Ochel]

Okay - but there should be never ever a segmentation fault - even for bad combinations of everything.
Also there should be some information in the help-text for impossible combinations and at least some kind of message if they are selected anyway.

[Jens Frenkel]

The best ist to remove the old matching and index reduction right now from the configuration options. Each second of work is wasted time.

We can discuss this to the next developer meeting.

[Lennart Ochel]

I agree. If these are obsolete options/modules they should be removed as soon as possible.

[Lennart Ochel]

I get the following compiler-errors if I use setMatchingAlgorithm("omc");

otherTests.pendulum4.o: In function `eqFunction_7':
otherTests.pendulum4.c:(.text+0x10f2): undefined reference to `der'
otherTests.pendulum4.o: In function `eqFunction_8':
otherTests.pendulum4.c:(.text+0x132e): undefined reference to `der'
otherTests.pendulum4.o: In function `eqFunction_17':
otherTests.pendulum4.c:(.text+0x1eb2): undefined reference to `der'
otherTests.pendulum4.o: In function `eqFunction_18':
otherTests.pendulum4.c:(.text+0x20ee): undefined reference to `der'
collect2: ld returned 1 exit status
make: *** [omc_main_target] Error 1

[Jens Frenkel]

• indexreduction method and matching "omc" are removed from omc