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FFI for Emacs

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Have you considering submitting this project for inclusion in Emacs? If this FFI and libffi were part of the standard Emacs distribution, FFI-using libraries would be much, much more convenient...

Currently this project has no license, which means [no one is able to use it or work on it](https://opensource.stackexchange.com/a/1721). Please consider adding an Open Source license to the repo.

As requested in #21, these are just the harmless bits as a separate pull-request.

Hi Tom, it was great talking to you at FOSDEM. I have finally gotten around to playing with this ffi and I'm liking it a lot but I immediately ran...

It would be good to have a way to at least work around integer truncation problems.

Call `ffi--prep-cif` and the `definer-function` of `ffi--struct-union-helper` in the calling environment of the macros not during the macro expansion. This is so that compiling programs that use `define-ffi-function`, `define-ffi-struct`, etc....

I've run into this problem (when building a libclang-based emacs plugin): when calling a function from a callback, the (global) environment pointer is nulled out after the function call (but...

There doesn't seem to be a good way to deal with TLS. It doesn't matter hugely since Emacs is single-threaded, but at least errno relies on TLS and we need...

in building PR to setup continuous integration for ffi: @tromey, I have some questions to ask you to complete this: - what ccompiler are you using? (version and co, so...