FMI export recently fails with array outputs

[Rüdiger Franke]

This is a modified version of ​testArrayEquations, reduced by many features, but extended with a vector output yx1:

model ArrayEquationsTest
  parameter Integer n = 10;
  input Real[n] u(start = 1:n);
  Real[n] x1(each start = 1);
  output Real[n] yx1;
equation
  when Clock(0.1) then
    // for eqation
    for i in 1:n loop
      x1[i] = if firstTick(x1[i]) then previous(x1[i]) else previous(x1[i]) + u[i];
      yx1[i] = x1[i];
    end for;
end ArrayEquationsTest;

Attempting to export this model as FMU with:

setCommandLineOptions("--std=3.3"); getErrorString();
setCommandLineOptions("-d=newInst,-nfScalarize,disableFMIDependency"); getErrorString();
setCommandLineOptions("--simCodeTarget=Cpp"); getErrorString();
loadFile("ArrayEquationsTest.mo"); getErrorString();
translateModelFMU(ArrayEquationsTest, version = "2.0"); getErrorString();

gives the error:

[/home/rfranke/OpenModelica/OMCompiler/Compiler/Template/Tpl.mo:2027:8-2027:159:writable] Error: Internal error Stack overflow when evaluating function:
[bt] #1 /home/rfranke/OpenModelica/build/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaRuntimeC.so(mmc_setStacktraceMessages_threadData)
[bt] #2 /home/rfranke/OpenModelica/build/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaRuntimeC.so(mmc_do_stackoverflow)
[bt] #3 /home/rfranke/OpenModelica/build/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(CodegenCppInit.fun_87)
[bt] #4 /home/rfranke/OpenModelica/build/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(CodegenCppInit.ScalarVariableTypeStartAttribute)
[bt] #5 /home/rfranke/OpenModelica/build/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(CodegenCppInit.fun_83)
[bt] #6 /home/rfranke/OpenModelica/build/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(CodegenCppInit.ScalarVariableType)
[bt] #7 /home/rfranke/OpenModelica/build/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(CodegenCppInit.fun_73)
[bt] #8 /home/rfranke/OpenModelica/build/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(CodegenCppInit.fun_76)
[bt] #9 /home/rfranke/OpenModelica/build/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(CodegenCppInit.scalarVariableXML)
[bt] #10 /home/rfranke/OpenModelica/build/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(CodegenCppInit.lm_74)
[bt] #11 /home/rfranke/OpenModelica/build/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(CodegenCppInit.fun_76)
[bt] #12 /home/rfranke/OpenModelica/build/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(CodegenCppInit.scalarVariableXML)
...
[bt] #1024 /home/rfranke/OpenModelica/build/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(CodegenCppInit.lm_74)
[bt] #1025 [...]
Error: Template error: A template call failed (/home/rfranke/OpenModelica/build/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so: (null)). One possible reason could be that a template imported function call failed (which should not happen for functions called from within template code; templates assert pure 'match'/non-failing semantics).

It was working with OM 1.14. It is not working with 1.16 and 1.17 anymore.