[Bug stdio/33300] strip --strip-unneeded "breaks" libc.a (causing segfault in Rust programs linked libc statically)

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=33300

--- Comment #18 from Sourceware Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by H.J. Lu <hjl@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b4ab549ae5558b9fd818a6268c32480b51fda9f6

commit b4ab549ae5558b9fd818a6268c32480b51fda9f6
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Thu Aug 21 16:57:22 2025 -0700

    libio: Properly link in libio functions in static binaries

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

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