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

[David Laight]

On Wed, 25 Feb 2026 22:25:12 +0100
Thomas Weißschuh <linux@xxxxxxxxxxxxxx> wrote:

> 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.

I copied the one from include/linux/compiler.h
Nothing seems to need that one either.
Can you take it out?

	David

> 
> > +/* 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
> >