native-comp: load-true-file-name compatibility

native-comp: load-true-file-name compatibility

[Kevin Liu]

I have come across some code that looks like this:

(defconst sayid-version
  (eval-when-compile (lm-version load-file-name)))

In native-comp I believe it has to use load-true-file-name instead,
however this variable only exists in native-comp.  What is a good way
to make this code compatible for both branches?

Re: native-comp: load-true-file-name compatibility

[Andrea Corallo via Emacs development discussions.]

Kevin Liu <kevin@nivekuil.com> writes:

> I have come across some code that looks like this:
>
> (defconst sayid-version
>   (eval-when-compile (lm-version load-file-name)))
>
> In native-comp I believe it has to use load-true-file-name instead,
> however this variable only exists in native-comp.  What is a good way
> to make this code compatible for both branches?

Hi Kevin,

ATM `load-file-name' has the value it would have loading the
conventional .elc file.  Therefore most likely this is already the
correct code and no modification is required, but it depends obviously
on what `lm-version' wants to do with that :)

Maybe you like to share more about the specific issue here.

  Andrea

Re: native-comp: load-true-file-name compatibility

[Kevin Liu]

Ah, you're right, that was a red herring.

The real problem is `sayid-version' is nil when it wasn't compiled in the current emacs session.
So if I delete the sayid-xxx.eln then restart, it recompiles and it is properly non-nil.
But I restart emacs again, `sayid-version' will be nil in the new session.

For me lm-version is defined in
/usr/share/emacs/28.0.50/lisp/emacs-lisp/lisp-mnt.el -- I haven't taken
the time to look at what it really does but I assume it parses the

;; Version: 0.1.0

line in an elisp file header.

Re: native-comp: load-true-file-name compatibility

[Andrea Corallo via Emacs development discussions.]

Kevin Liu <kevin@nivekuil.com> writes:

> Ah, you're right, that was a red herring.
>
> The real problem is `sayid-version' is nil when it wasn't compiled in the current emacs session.
> So if I delete the sayid-xxx.eln then restart, it recompiles and it is properly non-nil.
> But I restart emacs again, `sayid-version' will be nil in the new session.

Mmh, with a recent version (< 2 weeks old) of native-comp it should not
make a difference because load-file-name points to the .elc

> For me lm-version is defined in
> /usr/share/emacs/28.0.50/lisp/emacs-lisp/lisp-mnt.el -- I haven't taken
> the time to look at what it really does but I assume it parses the
>
> ;; Version: 0.1.0
>
> line in an elisp file header.

I suggest to make sure native-comp is recent and then have a look into
what's going on exactly or file a bug into the bug tracker.

Thanks

  Andrea