Re: [PATCH v3 next 01/17] tools/nolibc: Add _NOLIBC_OPTIMIZER_HIDE_VAR() to compiler.h

[Thomas Weißschuh]

On 2026-02-23 10:17:19+0000, david.laight.linux@xxxxxxxxx wrote:
> From: David Laight <david.laight.linux@xxxxxxxxx>
> 
> Needed to stop compiler 'optimisations' bloating code.
> Equivalent to the definition in include/linux/compiler.h
> 
> Signed-off-by: David Laight <david.laight.linux@xxxxxxxxx>
> ---
> 
> 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
>