[PATCH v1] x86: Add missing IS_IN (libc) check to strncmp-sse4_2.S

[Sunil Pandey]

On Wed, Jun 29, 2022 at 7:04 PM H.J. Lu via Libc-alpha
<libc-alpha@sourceware.org> wrote:
>
> On Wed, Jun 29, 2022 at 6:56 PM Noah Goldstein <goldstein.w.n@gmail.com> wrote:
> >
> > Was missing to for the multiarch build rtld-strncmp-sse4_2.os was
> > being built and exporting symbols:
> >
> > build/glibc/string/rtld-strncmp-sse4_2.os:
> > 0000000000000000 T __strncmp_sse42
> >
> > Introduced in:
> >
> > commit 11ffcacb64a939c10cfc713746b8ec88837f5c4a
> > Author: H.J. Lu <hjl.tools@gmail.com>
> > Date:   Wed Jun 21 12:10:50 2017 -0700
> >
> >     x86-64: Implement strcmp family IFUNC selectors in C
> > ---
> >  sysdeps/x86_64/multiarch/strncmp-sse4_2.S | 8 +++++---
> >  1 file changed, 5 insertions(+), 3 deletions(-)
> >
> > diff --git a/sysdeps/x86_64/multiarch/strncmp-sse4_2.S b/sysdeps/x86_64/multiarch/strncmp-sse4_2.S
> > index 9773e5fc09..310a6dbe77 100644
> > --- a/sysdeps/x86_64/multiarch/strncmp-sse4_2.S
> > +++ b/sysdeps/x86_64/multiarch/strncmp-sse4_2.S
> > @@ -16,6 +16,8 @@
> >     License along with the GNU C Library; if not, see
> >     <https://www.gnu.org/licenses/>.  */
> >
> > -#define STRCMP_SSE42 __strncmp_sse42
> > -#define USE_AS_STRNCMP
> > -#include "strcmp-sse42.S"
> > +#if IS_IN (libc)
> > +# define STRCMP_SSE42 __strncmp_sse42
> > +# define USE_AS_STRNCMP
> > +# include "strcmp-sse42.S"
> > +#endif
> > --
> > 2.34.1
> >
>
> LGTM.
>
> Thanks.
>
> --
> H.J.

I would like to backport this patch to release branches.
Any comments or objections?

--Sunil