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

[Xi Ruoyao]

On Thu, 2025-08-21 at 07:17 -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
> 
> 	.pushsection ".data.rel.ro.local","aw"
> .L_IO_file_open:
> 	.dc.a	_IO_file_open
> 	.popsection
> 
> This fixes BZ #33300.
> 
> Signed-off-by: H.J. Lu <hjl.tools@gmail.com>

Tested-by: Xi Ruoyao <xry111@xry111.site>

-- 
Xi Ruoyao <xry111@xry111.site>