From: david.laight.linux@gmail.com
To: "Willy Tarreau" <w@1wt.eu>,
"Thomas Weißschuh" <linux@weissschuh.net>,
linux-kernel@vger.kernel.org, "Cheng Li" <lechain@gmail.com>
Cc: David Laight <david.laight.linux@gmail.com>
Subject: [PATCH v3 next 01/17] tools/nolibc: Add _NOLIBC_OPTIMIZER_HIDE_VAR() to compiler.h
Date: Mon, 23 Feb 2026 10:17:19 +0000 [thread overview]
Message-ID: <20260223101735.2922-2-david.laight.linux@gmail.com> (raw)
In-Reply-To: <20260223101735.2922-1-david.laight.linux@gmail.com>
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
+/* 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:[~2026-02-23 10:18 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 ` david.laight.linux [this message]
2026-02-25 21:25 ` [PATCH v3 next 01/17] tools/nolibc: Add _NOLIBC_OPTIMIZER_HIDE_VAR() to compiler.h Thomas Weißschuh
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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