[gcc r16-9421] libstdc++: Remove unused variable

[Jakub Jelinek]

https://gcc.gnu.org/g:8546eca4d9d5fdbc4a6996a700156be110ff07fa

commit r16-9421-g8546eca4d9d5fdbc4a6996a700156be110ff07fa
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Tue Jul 28 10:52:28 2026 +0200

    libstdc++: Remove unused variable
    
    https://builder.sourceware.org/buildbot/#/builders/312/builds/3547
    shows
    In file included from /home/builder/shared/sw3bb1/worker/gcc-fullest-debian-amd64/gcc-build/prev-x86_64-pc-linux-gnu/libstdc++-v3/include/deque:72,
                     from /home/builder/shared/sw3bb1/worker/gcc-fullest-debian-amd64/gcc-build/prev-x86_64-pc-linux-gnu/libstdc++-v3/include/stack:68,
                     from ../../gcc/gcc/cobol/cobol-system.h:52,
                     from ../../gcc/gcc/cobol/lexio.cc:33:
    /home/builder/shared/sw3bb1/worker/gcc-fullest-debian-amd64/gcc-build/prev-x86_64-pc-linux-gnu/libstdc++-v3/include/bits/deque.tcc: In instantiation of ‘std::_Deque_iterator<_OTp, _OTp&, _OTp*> std::__uninitialized_copy_a(_Deque_iterator<_Tp, _Ref, _Ptr>, _Deque_iterator<_Tp, _Ref, _Ptr>, _Deque_iterator<_OTp, _OTp&, _OTp*>, allocator<_Tp>&) [with _ITp = source_format_t; _IRef = const source_format_t&; _IPtr = const source_format_t*; _OTp = source_format_t; _Tp = source_format_t]’:
    /home/builder/shared/sw3bb1/worker/gcc-fullest-debian-amd64/gcc-build/prev-x86_64-pc-linux-gnu/libstdc++-v3/include/bits/stl_deque.h:922:36:   required from ‘std::deque<_Tp, _Alloc>::deque(const std::deque<_Tp, _Alloc>&) [with _Tp = source_format_t; _Alloc = std::allocator<source_format_t>]’
      922 |       { std::__uninitialized_copy_a(__x.begin(), __x.end(),
          |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
      923 |                                     this->_M_impl._M_start,
          |                                     ~~~~~~~~~~~~~~~~~~~~~~~
      924 |                                     _M_get_Tp_allocator()); }
          |                                     ~~~~~~~~~~~~~~~~~~~~~~
    /home/builder/shared/sw3bb1/worker/gcc-fullest-debian-amd64/gcc-build/prev-x86_64-pc-linux-gnu/libstdc++-v3/include/bits/stl_stack.h:107:11:   required from here
      107 |     class stack
          |           ^~~~~
    /home/builder/shared/sw3bb1/worker/gcc-fullest-debian-amd64/gcc-build/prev-x86_64-pc-linux-gnu/libstdc++-v3/include/bits/deque.tcc:1577:19: error: unused variable ‘__sres’ [-Werror=unused-variable]
     1577 |             _OTp* __sres = __result._M_cur;
          |                   ^~~~~~
    cc1plus: all warnings being treated as errors
    make[3]: *** [Makefile:1218: cobol/lexio.o] Error 1
    
    There is indeed an unused variable introduced in r16-8142.
    
    The following patch removes it.
    
    2026-07-28  Jakub Jelinek  <jakub@redhat.com>
    
            * include/bits/deque.tcc (std::__uninitialized_copy_a): Remove unused
            variable __sres.
    
    (cherry picked from commit 51c8f33686071ce874915a6cfeb85f337071d45d)

Diff:
---
 libstdc++-v3/include/bits/deque.tcc | 1 -
 1 file changed, 1 deletion(-)

diff --git a/libstdc++-v3/include/bits/deque.tcc b/libstdc++-v3/include/bits/deque.tcc
index b35f268b0db1..df4be0802124 100644
--- a/libstdc++-v3/include/bits/deque.tcc
+++ b/libstdc++-v3/include/bits/deque.tcc
@@ -1574,7 +1574,6 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
 	      __n = __last._M_cur - __from;
 	    else
 	      __n = __first._M_last - __from;
-	    _OTp* __sres = __result._M_cur;
 	    __n = std::min<ptrdiff_t>(__n, __result._M_last - __result._M_cur);
 	    std::uninitialized_copy(__from, __from + __n, __result._M_cur);
 	    __first += __n;