[Bug libgcc/96845] New: undefined reference to `__aarch64_ldadd4_acq_rel'

[Bug libgcc/96845] New: undefined reference to `__aarch64_ldadd4_acq_rel'

[bero at lindev dot ch]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96845

            Bug ID: 96845
           Summary: undefined reference to `__aarch64_ldadd4_acq_rel'
           Product: gcc
           Version: 10.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libgcc
          Assignee: unassigned at gcc dot gnu.org
          Reporter: bero at lindev dot ch
  Target Milestone: ---

When compiling some packages on aarch64 (e.g. polkit-qt-1 0.113.0) on aarch64,
the build errors out with

/usr/lib64/gcc/aarch64-openmandriva-linux-gnu/10.2.0/../../../../aarch64-openmandriva-linux-gnu/bin/ld:
core/CMakeFiles/polkit-qt5-core-1.dir/polkitqt1-authority.cpp.o: in function
`std::__atomic_base<int>::operator++()':
/usr/include/c++/10.2.0/bits/atomic_base.h:326: undefined reference to
`__aarch64_ldadd4_acq_rel'

This seems to be caused by __aarch64_ldadd4_acq_rel being defined in libgcc,
but not libgcc_s, while only libgcc_s is pulled in automatically.

Some Linux distributions have a workaround for this in their gcc packaging -
they replace libgcc_s.so with an ld script that pulls in libgcc if needed (see
e.g. https://src.fedoraproject.org/rpms/gcc/blob/master/f/gcc.spec#_1303 )

[Bug libgcc/96845] undefined reference to `__aarch64_ldadd4_acq_rel'

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96845

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is a distro issue.
libgcc_s.so is a linker script when compiling GCC by itself.
It contains:
/* GNU ld script
   Use the shared library, but some functions are only in
   the static library.  */
GROUP ( libgcc_s.so.1 -lgcc )

---- CUT ----
SO again this is a distro issue.

[Bug libgcc/96845] undefined reference to `__aarch64_ldadd4_acq_rel'

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96845

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Bernhard Rosenkraenzer from comment #0)
> Some Linux distributions have a workaround for this in their gcc packaging -
> they replace libgcc_s.so with an ld script that pulls in libgcc if needed

Or rather they replace the already ld script with another ld script ...