Francesco Casella comments

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                                            Francesco Casella

Modelica-Buildings Library (master): Simulation fails at initialization because of Real parameter expressions evaluated to false by the OB

I compared the log I obtained when running the [simulation script](https://github.com/OpenModelica/OpenModelica/issues/13187#issuecomment-2734901388) with @kabdelhak, and there is a lot of different stuff there. @perost, would you mind running the [simulation script](https://github.com/OpenModelica/OpenModelica/issues/13187#issuecomment-2734901388)...

Modelica-Buildings Library (master): Simulation fails at initialization because of Real parameter expressions evaluated to false by the OB

OK, the fact that @kabdelhak's log came from Buildings 12.0.0 makes sense, otherwise I could not explain differences such as ```modelica 42: buiWitETS.mulPPum.y:VARIABLE(flow=false ) "Output signal connector" type: Real ```...

Modelica-Buildings Library (master): Simulation fails at initialization because of Real parameter expressions evaluated to false by the OB

Now I'm comparing the [log I obtained](https://github.com/user-attachments/files/19329496/log.zip) with Buildings 11.0.0 on my PC with @perost's [log](https://github.com/user-attachments/files/19432465/log1.txt.zip). The first 8220 lines are identical, then the fun begins at "After evaluating the...

Modelica-Buildings Library (master): Simulation fails at initialization because of Real parameter expressions evaluated to false by the OB

I got that with OpenModelica v1.25.0-dev-414-gb97bfa95a2, @perost maybe you can double-check the log diff if you compile the very same version, though I don't think that will make any difference,...

Modelica-Buildings Library (master): Simulation fails at initialization because of Real parameter expressions evaluated to false by the OB

@perost maybe you can try running the simulation with valgrind _using the omc version that is compiled and run by the CI_, if you can catch that.

Modelica-Buildings Library (master): Simulation fails at initialization because of Real parameter expressions evaluated to false by the OB

I tried to figure out how `buiWitETS.bui.terUniHea.T_aLoaHea_nominal` (which gets the bogus false value) is computed. From the flat model I'm getting: ```modelica parameter Real buiWitETS.THeaWatSup_nominal( quantity = "ThermodynamicTemperature", unit =...

Modelica-Buildings Library (master): Simulation fails at initialization because of Real parameter expressions evaluated to false by the OB

OK, let's see what happens with the next regression report. Thanks!

Modelica-Buildings Library (master): Simulation fails as the solver leads to division by zero at initialization

Mass fraction `X[1] = -1.64526` is obviously wrong. We need to investigate why this bogus solution is found.

Provide a bare-bones ModelicaUtilities.h file only providing the ModelicaUtilities function declarations

> The central question here is why any tool would depend on _ModelicaUtilities.h_ content that would not work with different tools? Excerpt from OpenModelica's `ModelicaUtilities.h`: ```C void ModelicaFormatMessage(const char *string,...

Provide a bare-bones ModelicaUtilities.h file only providing the ModelicaUtilities function declarations

Last call on this issue before we go ahead with the 4.1.0 release. As stated in the [MLS Section 12.9.6](https://specification.modelica.org/maint/3.6/functions.html#utility-functions): > This section describes the utility functions declared in ModelicaUtilities.h,...