[bug#53015] [PATCH 0/4] Add mangohud (update dear-imgui)

[John Kehayias via Guix-patches via <guix-patches@gnu.org>]

Hi Maxim,

------- Original Message -------

On Sunday, February 20th, 2022 at 11:11 PM, Maxim Cournoyer wrote:

> Hi John,
>
> John Kehayias john.kehayias@protonmail.com writes:
>
> > Hello,
> >
> > This patch (2/4 build option for spdlog, part of the MangoHud patch
> > series) may be superseded by
> > https://git.savannah.gnu.org/cgit/guix.git/commit/?id=b1542d59606919d0da04914fa6916b85354e2f89
> > (CCing Nicolas, hope that's okay!) I've built MangoHud with the shared
> > spdlog before, seems to work.
>
> That should solve the problem, yes!
>
> > However, given what spdlog has in its documentation, I wonder if it
> > would be better to default to the static version as before? I think
> > the "-fpic" build option would also work for shared linking in
> > general? Or does that not work for nheko, which this change was for I
> > believe?
>
> Do you mean this:
> https://github.com/gabime/spdlog/wiki/How-to-use-spdlog-in-DLLs ?
>

Yes, that's what I meant. I'm not familiar with spdlog, but was just going based on that and seeing packages build a static spdlog to use.

> > I'm not really sure though, nor have a strong opinion, just going
> > based on spdlog's info and that some projects (like MangoHud) build
> > spdlog as a static library by default when bundling. I'm guessing it
> > is for performance reasons, though I don't know if that is realized.
>
> Typically in Guix the libraries are offered as shared objects by
> default; and when desirable a static output can be added to which the
> static objects are copied.
>
> You could add a static output if you have such a need :-).
>

Got it. Personally, it doesn't matter much to me, I'm only assuming projects use the static version due to what upstream says and/or for performance reasons (no idea if that is realized though).

In the interest of moving this forward, I'm definitely fine leaving spdlog as it was updated. We could add a note that upstream and other projects prefer a static build and leave that to add as a TODO. I did take a stab at it some time ago, but it got slightly messy in trying to do it all together (I suppose I could just run the build a second time, but I think it also required modifications to other files to make the static build work separately? I forget now.)

Any thoughts on the imgui details? For me, I'd go for keeping both current (old) dear-imgui as hidden for ogre, adding the one I have here (hidden too? though useful Debian additions in the build) for mangohud, and consolidating to one up to date version once everything can use that. We could use the imgui you added for that, or wait for the more complete Debian build files we are using for dear-imgui right now (the pkg-config, for instance, is helpful).

Finally, the pciutils hardware data pci.ids came up in a new patch: https://issues.guix.gnu.org/54069 I commented on that issue about doing something similar here. I think we can figure out what to do in a core updates change (due to pciutils dependents). In the meantime, a pciutils variant and/or a separate hwdata package would be helpful. Funny enough, this is the last non-trivial change in this patch series, brought up by someone else. I guess the repeated work shows this would be useful though.

Would love to finally get this merged, with whatever changes we decide for imgui and pciutils. WDYT?

Thanks!
John