How to get a file name with a warning like this

How to get a file name with a warning like this

[Harry Putnam]

[Note: This message is reprint of a message posted on .. gnus.general
probably the wrong group since it is not gnus specific]

I've been getting this warning message:

Warning (bytecomp): Use ‘with-current-buffer’ ....
             rather than save-excursion+set-buffer
[all on one line] -hp]

... (for some months now) ...

emacs version:
,----
| GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo
|    version 1.14.8, Xaw3d scroll bars) of 2020-05-31
`----

I've searched obvious files like ~/.emacs ~/.gnus ...site-start.el
with no result.

How can I make the warning message tell me which file[s] it is finding
the problem code in?

Re: How to get a file name with a warning like this

[Emanuel Berg via Users list for the GNU Emacs text editor]

Harry Putnam wrote:

> Warning (bytecomp): Use ‘with-current-buffer’ ....
> rather than save-excursion+set-buffer [...]
>
> How can I make the warning message tell me which
> file[s] it is finding the problem code in?

Seem like a tough problem ... but ...

wait!

I just got a moment of inspiration!

What about using `with-current-buffer' rather than
`save-excursion' and `set-buffer'

???

-- 
underground experts united
http://user.it.uu.se/~embe8573
https://dataswamp.org/~incal

Re: How to get a file name with a warning like this

[Emanuel Berg via Users list for the GNU Emacs text editor]

>> Warning (bytecomp): Use ‘with-current-buffer’ ....
>> rather than save-excursion+set-buffer [...]
>> How can I make the warning message tell me which
>> file[s] it is finding the problem code in?
>
> Seem like a tough problem ... but ...
>
> wait!
>
> I just got a moment of inspiration!
>
> What about using `with-current-buffer' rather than
> `save-excursion' and `set-buffer'
>
> ???

Heh, sorry, but to answer you question ... the byte
compiler should tell you already what file is the
origin of the warning. B/c you yanked the error
message here, this makes it even weirder, b/c that
means you killed the part that tells in what file
it happened.

-- 
underground experts united
http://user.it.uu.se/~embe8573
https://dataswamp.org/~incal

Re: How to get a file name with a warning like this

[Stefan Monnier]

> Warning (bytecomp): Use ‘with-current-buffer’ ....
>              rather than save-excursion+set-buffer

Usually, this comes from the byte-compiler when it's called directly via
`byte-compile` with an Elisp expression as argument, rather than by
compiling a file, so the compiler has no idea which file it comes from.
You might try `M-x trace-function RET byte-compile RET` but you have to
do that before the warning is emitted.


        Stefan

Re: How to get a file name with a warning like this

[Emanuel Berg via Users list for the GNU Emacs text editor]

Stefan Monnier wrote:

>> Warning (bytecomp): Use ‘with-current-buffer’ ....
>> rather than save-excursion+set-buffer
>
> Usually, this comes from the byte-compiler when
> it's called directly via `byte-compile` with an
> Elisp expression as argument, rather than by
> compiling a file, so the compiler has no idea which
> file it comes from. You might try `M-x
> trace-function RET byte-compile RET` but you have
> to do that before the warning is emitted.

OK, that explains it, sorry.

That said... even so, why not simply grep the entire
source for save-excursion and set-buffer ?

And fix every instance?

-- 
underground experts united
http://user.it.uu.se/~embe8573
https://dataswamp.org/~incal

Re: How to get a file name with a warning like this

[Emanuel Berg via Users list for the GNU Emacs text editor]

> why not simply grep the entire source for
> save-excursion and set-buffer ?

... using the byte compiler!

-- 
underground experts united
http://user.it.uu.se/~embe8573
https://dataswamp.org/~incal