SWIG VS libffi

This sounds a bit like SWIG. You give SWIG an "interface file" describing the API of a library, and it uses that to spit out a bunch of language-specific bindings for that library.

Try out http://www.swig.org/

SWIG

Check out the site www.swig.org it will answer several of your questions. XS code is specific to Perl that you have to know how to code and use. SWIG takes code from C and C++ (actually several languages) and uses code templates to generate all the XS code for you. I wrote both a C library and C++ library doing different things, and used SWIG to import them into Perl (via "use"), Python and PHP. There is a learning curve, but it's not that bad, and there is a lot of great documentation and examples on the SWIG site.

Ohhh alrightt I went through the installation of pypodofo. 1. Install podofo library. For example in archlinux, pacman -S podofo 2. Install swig tool. Note, you should have installed gcc and g++ compilers 3. Build wrapper. python setup.py build 4. Copy dynamic library to python package. cp build/lib.linux-x86_64-3.7/_api.cpython-37m-x86_64-linux-gnu.so pypodofo/ 5. Install requirements. pip install -r requirements.txt (if possible in a virtualenv). 6. Run tests. nosetests tests/

Another option is SWIG, but I don't like it too much.

* I was using SWIG (http://www.swig.org/) 15+20 years ago to bind C/C++ to Perl and Java and it still exists.*

I've used it. It took the entire thing you want to call and generated one giant file of munged C. That's sort of where that idea takes you.

But the author is on to something. There's a C to Rust translator. It sucks, because it works by emulating C pointer arithmetic in unsafe Rust, using its own set of primitives along the lines of "offset this pointer by this much". Now you have ugly, unsafe Rust.

What's needed is something that infers the meaning of an ambiguous function call from the code. Something that reasons like this:

Function call:

    int read(char* buf, size_t n)

For the parsing part it is probably not a big deal. Either your own elisp code or use something like clangd. I am not so knowledgable about the implementation deatils for LSP & Co, but it is definitely possible to parse headers and extract definitions. There are also tools like swig.

ok... I did my python 3.9 upgrade on my Rpi3b+ ... here's what I learned: 1) If you're running Debian Buster, you really probably want to upgrade to Bullseye first https://www.tomshardware.com/how-to/upgrade-raspberry-pi-os-to-bullseye-from-buster If you stay on buster, then homeassistant won't start until you build libffi-3.3 as below: 2021-12-29 16:51:14 ERROR (MainThread) [homeassistant.auth.providers] Unable to load auth provider homeassistant: libffi.so.7: cannot open shared object file: No such file or directory https://community.home-assistant.io/t/python-install-on-raspberry-pi-os/241558/12 wget "https://github.com/libffi/libffi/releases/download/v3.3/libffi-3.3.tar.gz" tar zxf libffi-3.3.tar.gz cd libffi-3.3 ./configure sudo make install sudo ldconfig Other than that, it was pretty straightforward. Do be aware that after you redeploy home assistant, a LOT of stuff is happening in the background and it will take a while before everything comes up. Don't freak out. Don't reboot or power cycle. Instead, do this: tail -f /var/log/homeassistant/home-assistant.log and watch the updates

build-essential installs everything required for compiling basic software written in C and C++ in this case Python. Read more... zlib1g-devis the development package of the compression library that implements the deflate compression methods and essential in Python's installation and other installations as well. Read more... libncurses5-dev is the development package for the curses library that provides a terminal-independent screen-painting and keyboard-handling tool. Read more... libgdbm-dev is a development library for GDBM whose functionality is to store key/data pairs in a data file. Read more... libnss3-dev Read more... libssl-dev Read more... libreadline-dev Read more... libffi-dev Read more... libsqlite3-dev Read more... wget Read more... libbz2-dev Read more... In the next step we can either manually download the latest release of Python from the Python Official Release page or use wget which we have installed in previous command. To download using wget, paste the following command in the terminal to download Python in the computer.

[INFO]: -> running basename https://github.com/libffi/libffi/archive/v3.3.tar.gz

libffi C library

If you have read my earlier posts you know I love multilingual programming. One important part of multilingual programming is how to interface one language with other. Typically this is called FFI or foreign function interface. At the lowest level often there are libraries (aka bindings) to talk across languages or across implementations of same language e.g. libffi. In my undergrad we did a group project where we created language bindings to separate algorithmic part written in python and opencv and X11 logic in c.

is itself related to the bug in the build script, for https://github.com/libffi/libffi dependency. Thus not an issue of your distro/beyond the scope of this bug.