linux-kernel - Re: [RFC PATCH 3/3] tools/nolibc: add a new "install_all

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Message-ID: <20250627054918.GB4540@1wt.eu>
Date: Fri, 27 Jun 2025 07:49:18 +0200
From: Willy Tarreau <w@....eu>
To: Thomas Weißschuh <linux@...ssschuh.net>
Cc: Arnd Bergmann <arnd@...db.de>,
        Thomas Weißschuh <thomas.weissschuh@...utronix.de>,
        linux-kernel@...r.kernel.org, Masahiro Yamada <masahiroy@...nel.org>
Subject: Re: [RFC PATCH 3/3] tools/nolibc: add a new "install_all_archs"
 target

On Fri, Jun 27, 2025 at 07:46:18AM +0200, Willy Tarreau wrote:
> On Fri, Jun 27, 2025 at 07:11:45AM +0200, Thomas Weißschuh wrote:
> > On 2025-06-26 23:15:07+0200, Arnd Bergmann wrote:
> (...)
> > With the symlink, a given generic UAPI tree can be specialized to one
> > specific architecture. But here we want to create a full sysroot that works
> > for all architectures *at the same time*. So a symlink would not be enough.
> 
> Exactly!
> 
> > > If it's indeed possible to concatenate the path name (I couldn't
> > > figure that out either), that could also be done in place of the
> > > symlink but simpler than the #if/#elif/#elif/... block, like
> > > 
> > > #include <arch.h> // defines ARCH_PREFIX
> > > #include CONCAT(ARCH_PREFIX, ioctl.h)
> > 
> > If we can't get it to work like this I would still prefer to have a
> > template header file which gets specialized with sed instead of the
> > Makefile loop.
> 
> The thing is that it's not a single header, it's for each header file
> present in asm/. And we can't request that anyone adding anything into
> asm would also have to maintain one extra template for each of them.
> 
> Or I'm simply not getting how you would envision it maybe.

Or do you mean a template that contains all #ifdef/#include for all
archs, that serves as the basis to rebuild all headers, and that we
still have the loop on all files in the makefile ? I.e. you simply
want to drop the arch loop ? If that's it, yes I'm fine with this as
well and can give it a try.

Willy