linux-kernel - Re: [PATCH rebased] kbuild: rpm-pkg: Fix build with non-default MODLIB

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Date:   Fri, 10 Nov 2023 18:44:22 +0100
From:   Michal Suchánek <msuchanek@...e.de>
To:     Jan Engelhardt <jengelh@...i.de>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nicolas Schier <nicolas@...sle.eu>,
        linux-modules@...r.kernel.org, Takashi Iwai <tiwai@...e.com>,
        Lucas De Marchi <lucas.de.marchi@...il.com>,
        Michal Koutný <mkoutny@...e.com>,
        Jiri Slaby <jslaby@...e.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH rebased] kbuild: rpm-pkg: Fix build with non-default
 MODLIB

On Wed, Oct 18, 2023 at 03:12:41AM +0200, Jan Engelhardt wrote:
> On Tuesday 2023-10-17 17:10, Michal Suchánek wrote:
> >
> >> In my system (Ubuntu), I see the directory paths
> >> 
> >> /usr/aarch64-linux-gnu/lib/
> >> /usr/i686-linux-gnu/lib/
> >> /usr/x86_64-linux-gnu/lib/
> >> 
> >> If there were such a crazy distro that supports multiple kernel arches
> >> within a single image, modules might be installed:
> >> /usr/x86_64-linux-gnu/lib/module/<version>/
> >
> >For me it's /usr/lib/i386-linux-gnu/.
> >
> >Did they change the scheme at some point?
> 
> It's a complicated mumble-jumble. Prior art exists as in:
> 
>  /opt/vendorThing/bin/...
>  /usr/X11R6/lib/libXi.so.6 [host binary]
>  /usr/x86_64-w64-mingw32/bin/as [host binary]
>  /usr/x86_64-w64-mingw32/sys-root/mingw/bin/as.exe [foreign binary]
>  /usr/platform/SUNW,Ultra-2/lib/libprtdiag_psr.so.1 [looks foreign]
> 
> The use of suffix-based naming must have been established sometime
> near the end of the 90s or the start of 2000s as the first biarch
> Linux distros emerged. Probably in gcc or glibc sources one will find
> the root of where the use of suffix identifiers like /usr/lib64
> started. Leaves the question open "why".

That's pretty clear: to be able to install libraries for multiple
architectures at the same time.

Thanks

Michal