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

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Message-ID: <20250627054618.GA4540@1wt.eu>
Date: Fri, 27 Jun 2025 07:46:18 +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 07:11:45AM +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.

Willy