From: "Thomas Weißschuh" <linux@weissschuh.net>
To: david.laight.linux@gmail.com
Cc: Willy Tarreau <w@1wt.eu>,
linux-kernel@vger.kernel.org, Cheng Li <lechain@gmail.com>
Subject: Re: [PATCH v3 next 01/17] tools/nolibc: Add _NOLIBC_OPTIMIZER_HIDE_VAR() to compiler.h
Date: Wed, 25 Feb 2026 22:25:12 +0100 [thread overview]
Message-ID: <5cd824ee-bdbb-447a-8ea1-d415d0962016@t-8ch.de> (raw)
In-Reply-To: <20260223101735.2922-2-david.laight.linux@gmail.com>
On 2026-02-23 10:17:19+0000, david.laight.linux@gmail.com wrote:
> From: David Laight <david.laight.linux@gmail.com>
>
> Needed to stop compiler 'optimisations' bloating code.
> Equivalent to the definition in include/linux/compiler.h
>
> Signed-off-by: David Laight <david.laight.linux@gmail.com>
> ---
>
> New patch for v3.
>
> tools/include/nolibc/compiler.h | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/tools/include/nolibc/compiler.h b/tools/include/nolibc/compiler.h
> index a8c7619dcdde..8e0eef434eec 100644
> --- a/tools/include/nolibc/compiler.h
> +++ b/tools/include/nolibc/compiler.h
> @@ -71,4 +71,9 @@
> # define __nolibc_static_assert(_t)
> #endif
>
> +#ifndef _NOLIBC_OPTIMIZER_HIDE_VAR
The ifndef guard should not be necessary.
> +/* Make the optimizer believe the variable can be manipulated arbitrarily. */
> +#define _NOLIBC_OPTIMIZER_HIDE_VAR(var) __asm__ ("" : "+r" (var))
> +#endif
> +
> #endif /* _NOLIBC_COMPILER_H */
> --
> 2.39.5
>
next prev parent reply other threads:[~2026-02-25 21:25 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-23 10:17 [PATCH v3 next 00/17] Enhance printf() david.laight.linux
2026-02-23 10:17 ` [PATCH v3 next 01/17] tools/nolibc: Add _NOLIBC_OPTIMIZER_HIDE_VAR() to compiler.h david.laight.linux
2026-02-25 21:25 ` Thomas Weißschuh [this message]
2026-02-25 22:17 ` David Laight
2026-02-25 22:24 ` Thomas Weißschuh
2026-02-23 10:17 ` [PATCH v3 next 02/17] tools/nolibc: Optimise and common up the number to ascii functions david.laight.linux
2026-02-25 21:40 ` Thomas Weißschuh
2026-02-25 22:09 ` David Laight
2026-02-23 10:17 ` [PATCH v3 next 03/17] selftests/nolibc: Fix build with host headers and libc david.laight.linux
2026-02-25 21:24 ` Thomas Weißschuh
2026-02-23 10:17 ` [PATCH v3 next 04/17] selftests/nolibc: Improve reporting of vfprintf() errors david.laight.linux
2026-02-25 21:56 ` Thomas Weißschuh
2026-02-26 10:12 ` David Laight
2026-02-26 21:39 ` Thomas Weißschuh
2026-02-23 10:17 ` [PATCH v3 next 05/17] tools/nolibc: Implement strerror() in terms of strerror_r() david.laight.linux
2026-02-25 22:09 ` Thomas Weißschuh
2026-02-25 22:58 ` David Laight
2026-02-23 10:17 ` [PATCH v3 next 06/17] tools/nolibc/printf: Change variables 'c' to 'ch' and 'tmpbuf[]' to 'outbuf[]' david.laight.linux
2026-02-25 22:23 ` Thomas Weißschuh
2026-02-23 10:17 ` [PATCH v3 next 07/17] tools/nolibc/printf: Move snprintf length check to callback david.laight.linux
2026-02-25 22:37 ` Thomas Weißschuh
2026-02-25 23:12 ` David Laight
2026-02-26 21:29 ` Thomas Weißschuh
2026-02-26 22:11 ` David Laight
2026-02-23 10:17 ` [PATCH v3 next 08/17] tools/nolibc/printf: Output pad characters in 16 byte chunks david.laight.linux
2026-02-23 10:17 ` [PATCH v3 next 09/17] tools/nolibc/printf: Simplify __nolibc_printf() david.laight.linux
2026-02-23 10:17 ` [PATCH v3 next 10/17] tools/nolibc/printf: Use goto and reduce indentation david.laight.linux
2026-02-23 10:17 ` [PATCH v3 next 11/17] tools/nolibc/printf: Use bit-masks to hold requested flag, length and conversion chars david.laight.linux
2026-02-23 10:17 ` [PATCH v3 next 12/17] tools/nolibc/printf: Handle "%s" with the numeric formats david.laight.linux
2026-02-23 10:17 ` [PATCH v3 next 13/17] tools/nolibc/printf: Add support for conversion flags david.laight.linux
2026-02-23 10:17 ` [PATCH v3 next 14/17] tools/nolibc/printf: Add support for left aligning fields david.laight.linux
2026-02-23 10:17 ` [PATCH v3 next 15/17] tools/nolibc/printf: Add support for zero padding and field precision david.laight.linux
2026-02-23 10:17 ` [PATCH v3 next 16/17] tools/nolibc/printf: Add support for octal output david.laight.linux
2026-02-23 10:17 ` [PATCH v3 next 17/17] selftests/nolibc: Use printf variable field widths and precisions david.laight.linux
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