Hello, I am asking for some general guidance on the following task, There is a legacy code, written in C, that I would like to use directly in Julia. Ideally, I would like to be able to differentiate it as well (the code can be found here ). So, my questions are: which tools should I be using t…

Hi Marco! I made the lightweight wrapper CLASS.jl package to simplify comparisons to SymBoltz.jl . Feel free to check it out and change it around. Check test/ for some simple examples and here (expand “Setup”) for a more complex one. It is structured like a problem/solution interface fairly generica…

Base Julia is technically enough for calling C shared libraries, though packages can help. Enzyme works on LLVM so you could use it directly on C. I haven’t seen a tutorial on Enzyme for Julia calling external code, but I’ve heard it’s possible (not necessarily implemented) if the LLVM IR is there. …

Just noting down some resources I found on using Enzyme through external calls: Calling C Code with Automatic Differentiation in Julia Is it possible to use autodiff on an external program? External C Libraries and Runtime Dynamic Linking `dlopen` Not Picked Up by Enzyme · Issue #2452 · EnzymeAD/E…

To differentiate through CLASS and make it compatible with Enzyme, should one perhaps look to modify it so there is a pure C function that one can ccall from Julia (like here ) to return the desired output as a function of some given input parameters? Maybe something like this: void output_from_inpu…

Using legacy C code with autodifferentiation

General Usage

hersle October 28, 2025, 2:18pm 4

Just noting down some resources I found on using Enzyme through external calls:

Calling C Code with Automatic Differentiation in Julia
Is it possible to use autodiff on an external program?
External C Libraries and Runtime Dynamic Linking `dlopen` Not Picked Up by Enzyme · Issue #2452 · EnzymeAD/Enzyme.jl · GitHub

Topic		Replies	Views
Calling C Code with Automatic Differentiation in Julia Numerics question , differentiation , c , autodiff	6	440	June 2, 2025
Is it possible to use autodiff on an external program? General Usage question , llvm , enzyme	2	311	January 8, 2024
Guidelines for wrapping a simple C library in Julia General Usage ccall , binarybuilder , c , clang	6	1616	March 31, 2024
Differentiate Fortran90 code that implements a Boundary element method General Usage	2	406	October 30, 2022
Calling Julia algorithm from C General Usage c	6	914	February 25, 2020

Using legacy C code with autodifferentiation

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