[PATCH v2] libio: Properly link in libio functions in static binaries

[H.J. Lu]

On Fri, Aug 22, 2025 at 10:28 AM Xi Ruoyao <xry111@xry111.site> wrote:
>
> On Thu, 2025-08-21 at 16:57 -0700, H.J. Lu wrote:
> > commit 3020f72618e4f1d7338cd42b8bc7b2813e961b5a
> > Author: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>
> > Date:   Tue Dec 27 18:11:43 2022 -0300
> >
> >     libio: Remove the usage of __libc_IO_vtables
> >
> > added
> >
> >  #define libio_static_fn_required(name) __asm (".globl " #name);
> >
> > to link in libio functions in static binaries.  But there is no relocation
> > in
> >       .globl  _IO_file_open
> >
> > and "strip --strip-unneeded" will remove such unreferenced symbols which
> > breaks static binaries.  Redefine libio_static_fn_required to create a
> > reference to the required function with
> >
> > static __typeof (name) *const name##_p __attribute__((used)) = name;
> >
> > This fixes BZ #33300.
> >
> > Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
>
> Again:
>
> Tested-by: Xi Ruoyao <xry111@xry111.site>
>
> --
> Xi Ruoyao <xry111@xry111.site>

I checked it in after testing s390x-linux-gnu with build-many-glibcs.py.


-- 
H.J.