Record input connectors wrongly interpreted by the OpenModelica compiler

[mats.l.larsson@…]

It seems that the OpenModelica compiler wrongly interprets inputs based on record data types.

The three following models a,b,c are essentially the same model, but using different set ups of data types.

The use of scalar types (block a) compiles properly, as well as the use of vectorized data types (block b). However, when a record data type (block c) is used the compilation fails with error regarding a mismatch between the number of unknowns (2 equations and 4 unknowns are reported).

This is indeed very strange, since the instantiated model actually has the correct code (see below) that is equivalent to the manually coded block a:

correct automatically generated code for block c
class inputoutput.c

input Real u.a;
input Real u.b;
output Real y.a;
output Real y.b;

equation

y.a = u.a;
y.b = u.b;

end inputoutput.c;

package inputoutput

record sig

Real a,b;

end sig;

block a compiles with OpenModelica 1.9 r17338

block a

input Real a,b;
output Real A,B;

equation

A = a;
B = b;

end a;

block b compiles with OpenModelica 1.9 r17338

block b

input Real u[2];
output Real y[2];

equation

y = u;

end b;

block cfails to compile with OpenModelica 1.9 r17338

block c

input sig u;
output sig y;

equation

y = u;

end c;
annotation(Icon(coordinateSystem(extent = {{-100,-100},{100,100}}, preserveAspectRatio = true, initialScale = 0.1, grid = {2,2})), Diagram(coordinateSystem(extent = {{-100,-100},{100,100}}, preserveAspectRatio = true, initialScale = 0.1, grid = {2,2})), uses(Modelica(version = "3.2")));

end inputoutput;