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Re: Safety of elisp-flymake-byte-compile (Was Re: [Emacs-diffs] scratch/

From: Stefan Monnier
Subject: Re: Safety of elisp-flymake-byte-compile (Was Re: [Emacs-diffs] scratch/allow-custom-load-paths)
Date: Fri, 14 Dec 2018 08:27:12 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

> Oh, I didn't know about load-history. So is this usable?
>     (defun moderately-trusted-p (file)
>       (catch 'done
>         (let ((file (expand-file-name file))
>               (lhist load-history)
>               (lpath load-path)
>               probe)
>           (and
>            (string-match "\\.elc?$" file)

>            (while (setq probe (pop lhist))
>              (when (and (car probe)
>                         (equal (file-name-sans-extension file)
>                                (file-name-sans-extension (car probe))))
>                (throw 'done t)))
>            (while (setq probe (pop lpath))
>              (when (equal (file-name-as-directory
>                            (file-name-directory file))
>                           (file-name-as-directory probe))
>                (throw 'done t)))))))


> Or do you want to write this in C for speed?  Where should this be
> plugged into?  load in lread.c directly?

I don't understand the question.  AFAIK this would only be used within
bytecomp.el when processing a `defmacro` in order to decide whether it
should be added to byte-compile-macro-environment or not.

> We should still hand load-path and load-history, or a part of
> load-history down to the flymake'in slave emacs, right?

Ah, right, we'd then need to pass the `car` of load-history entries to
the slave.


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