bug#72921: Building emacs-yaml with emacs takes approximately eternity

bug#72921: Building emacs-yaml with emacs takes approximately eternity

[Tomas Volf]

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The emacs-yaml package is configured to build against emacs-minimal,
which seems to work.  When you however switch to emacs package, it takes
way to long to build, much longer than compiling for example firefox
package.  That feels off.

--8<---------------cut here---------------start------------->8---
$ time guix time-machine -q --commit=b8327cb31199fb9f4ebed6c53a59601d41def5a1 -- build --check --no-grafts -q --with-input=emacs-minimal=emacs-minimal emacs-yaml
/gnu/store/8lqdd8yna92zqgsgip396a1wbyhr5pfn-emacs-yaml-0.5.5
12.573 secs
$ time guix time-machine -q --commit=b8327cb31199fb9f4ebed6c53a59601d41def5a1 -- build --check --no-grafts -q --with-input=emacs-minimal=emacs emacs-yaml
/gnu/store/ja9xfndhfafjczp6n7qfy1h21hvdpd5j-emacs-yaml-0.5.5
2869.878 secs
--8<---------------cut here---------------end--------------->8---

The difference is huge.  The process taking vast majority of the time
(in the emacs version) is this one:

--8<---------------cut here---------------start------------->8---
32393 guixbuil 47:10 {.emacs-29.4-rea} /gnu/store/y7yhpgi48klqpadrmfknl4bln9c4n05y-emacs-29.4/bin/emacs -no-comp-spawn -Q --batch -l /tmp/guix-build-emacs-yaml-0.5.5.drv-0/emacs-int-comp-yaml-pbHFU3.el
--8<---------------cut here---------------end--------------->8---

I do not know enough to even guess what could be the problem, but it was
suggested I should bug-report this.

Cheers,
Tomas

-- 
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

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bug#72921: Building emacs-yaml with emacs takes approximately eternity

[Liliana Marie Prikler]

Am Samstag, dem 31.08.2024 um 23:01 +0200 schrieb Tomas Volf:
> The emacs-yaml package is configured to build against emacs-minimal,
> which seems to work.  When you however switch to emacs package, it
> takes way to long to build, much longer than compiling for example
> firefox package.  That feels off.
> 
> --8<---------------cut here---------------start------------->8---
> $ time guix time-machine -q --
> commit=b8327cb31199fb9f4ebed6c53a59601d41def5a1 -- build --check --
> no-grafts -q --with-input=emacs-minimal=emacs-minimal emacs-yaml
> /gnu/store/8lqdd8yna92zqgsgip396a1wbyhr5pfn-emacs-yaml-0.5.5
> 12.573 secs
> $ time guix time-machine -q --
> commit=b8327cb31199fb9f4ebed6c53a59601d41def5a1 -- build --check --
> no-grafts -q --with-input=emacs-minimal=emacs emacs-yaml
> /gnu/store/ja9xfndhfafjczp6n7qfy1h21hvdpd5j-emacs-yaml-0.5.5
> 2869.878 secs
> --8<---------------cut here---------------end--------------->8---
> 
> The difference is huge.  The process taking vast majority of the time
> (in the emacs version) is this one:
> 
> --8<---------------cut here---------------start------------->8---
> 32393 guixbuil 47:10 {.emacs-29.4-rea}
> /gnu/store/y7yhpgi48klqpadrmfknl4bln9c4n05y-emacs-29.4/bin/emacs -no-
> comp-spawn -Q --batch -l /tmp/guix-build-emacs-yaml-0.5.5.drv-
> 0/emacs-int-comp-yaml-pbHFU3.el
> --8<---------------cut here---------------end--------------->8---
> 
> I do not know enough to even guess what could be the problem, but it
> was suggested I should bug-report this.
This issue has already been reported updstream [1], but not addressed
yet: What takes so long between emacs-minimal and plain emacs is the
fact that plain emacs does native compilation.  

emacs-build-system currently uses native compilation whenever that is
supported by the emacs used to build.  Perhaps we should allow for some
choice here – ideas welcome.

Cheers

[1] https://github.com/zkry/yaml.el/issues/53