The Julia tools can target embedded devices through LLVM if it has an LLVM compiler. This is one of the big reasons for the juliac ahead-of-time compilation functionalities recently added to Julia v1.12, it's for the JuliaSim/ModelingToolkit.jl simulation environments to target embedded devices in this manner. We'll be sharing something on this at the MODPROD OpenModelica conference early next year.
As for C code, we're working on it through JuliaSim. JuliaSim's modeling language is very similar to Modelica in some aspects (Mike Tiller who is in this thread and the author of many of the main Modelica teaching tools is also one of the creators of this language), though there were some breaks which were required in order to make better downstream integrations with the Julia stack and in order to modernize development workflows (integrations with package management, some new langauge features, etc.). Part of what we're trying to do is solve exactly where Modelica got stuck: embedded code generation and other "non-GUI workflows" (CI/CD for example) and making those first-class integrated with the declarative modeling language. There's still a good amount of work to do but we've already started trickling out some results in this direction and running workshops on the tools at Modelica conferences.
As for C code, we're working on it through JuliaSim. JuliaSim's modeling language is very similar to Modelica in some aspects (Mike Tiller who is in this thread and the author of many of the main Modelica teaching tools is also one of the creators of this language), though there were some breaks which were required in order to make better downstream integrations with the Julia stack and in order to modernize development workflows (integrations with package management, some new langauge features, etc.). Part of what we're trying to do is solve exactly where Modelica got stuck: embedded code generation and other "non-GUI workflows" (CI/CD for example) and making those first-class integrated with the declarative modeling language. There's still a good amount of work to do but we've already started trickling out some results in this direction and running workshops on the tools at Modelica conferences.