[PATCH 2/2] libstdc++: Remove symbols for new std::call_once implementation [PR 99341]

[Jonathan Wakely]

On 12/03/21 17:46 +0000, Jonathan Wakely wrote:
>This removes the new symbols added for the new futex-based
>std::call_once implementation. These symbols were new on trunk, so not
>in any released version. However, they are already present in some
>beta distro releases (Fedora Linux 34) and in Fedora Linux rawhide. This
>change can be locally reverted by distros that need to keep the symbols
>present until affected packages have been rebuilt.
>
>libstdc++-v3/ChangeLog:
>
>        PR libstdc++/99341
>        * config/abi/post/aarch64-linux-gnu/baseline_symbols.txt: Remove
>        std::once_flag symbols.
>        * config/abi/post/ia64-linux-gnu/baseline_symbols.txt: Likewise.
>        * config/abi/post/m68k-linux-gnu/baseline_symbols.txt: Likewise.
>        * config/abi/post/riscv64-linux-gnu/baseline_symbols.txt:
>        Likewise.
>        * config/abi/pre/gnu.ver: Likewise.
>        * src/c++11/mutex.cc [_GLIBCXX_HAVE_LINUX_FUTEX]
>        (struct __once_flag_compat): Remove.
>        (_ZNSt9once_flag11_M_activateEv): Remove.
>        (_ZNSt9once_flag9_M_finishEb): Remove.
>
>Tested x86_64-linux, powerpc64-linux and powerpc64le-linux, but not yet
>committed (it's not really appropriate for a last-minute Friday
>change!)

I've now pushed [PATCH 1/2] and this one.