On Mon, Mar 02, 2026 at 10:17:53AM +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
Can definitely be useful from time to time, I'm doing similar things
in my programs all the time and after I regret not having centralized
it. Here it will help contributors who could get discouraged by code
size variations caused by their tiny changes.
> Signed-off-by: David Laight <david.laight.linux@gmail.com>
Acked-by: Willy Tarreau <w@1wt.eu>
Willy
> ---
> Changes for v4:
> - Remove #if guard
>
> tools/include/nolibc/compiler.h | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/tools/include/nolibc/compiler.h b/tools/include/nolibc/compiler.h
> index a8c7619dcdde..f03f84cfadce 100644
> --- a/tools/include/nolibc/compiler.h
> +++ b/tools/include/nolibc/compiler.h
> @@ -71,4 +71,7 @@
> # define __nolibc_static_assert(_t)
> #endif
>
> +/* Make the optimizer believe the variable can be manipulated arbitrarily. */
> +#define _NOLIBC_OPTIMIZER_HIDE_VAR(var) __asm__ ("" : "+r" (var))
> +
> #endif /* _NOLIBC_COMPILER_H */
> --
> 2.39.5