[Bug gold/28122] New: [gold] Use of deleted constructor with latest GCC

[msc at linux dot ibm.com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28122

            Bug ID: 28122
           Summary: [gold] Use of deleted constructor with latest GCC
           Product: binutils
           Version: 2.38 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gold
          Assignee: ccoutant at gmail dot com
          Reporter: msc at linux dot ibm.com
                CC: ian at airs dot com
  Target Milestone: ---

Building binutils with latest GCC causes issues when building gold.

Reproduced with:
arch: ppc64le
Using GCC: 8bf5b49ebd2176b8c535147377381dd07fbdd643
binutils: f878836265702be977ad9d1ea6d4fbdc4dac64cf

Steps to reproduce:
$ cd ~/build/gcc
$ ~/src/gcc/configure --prefix=/home/mscastanho/usr --enable-languages=c,c++
--with-glibc-version=2.33 --disable-bootstrap CC=gcc-11 CXX=g++-11 && make -j20
&> _make; make install

$ cd ~/build/binutils
$ myusr=/home/mscastanho/usr/; CC=${myusr}/bin/gcc CXX=${myusr}/bin/g++
CFLAGS="-g -O2 -Wno-error=array-bounds" CXXFLAGS="-g -O2"
~/src/binutils-gdb/configure --prefix=${myusr} --disable-gdb
--disable-gdbserver --disable-readline --disable-libdecnumber --disable-sim
--disable-nls --enable-shared --enable-plugins --enable-install-libiberty=./
--enable-gold --enable-follow-debug-links=no && make -j16

Error:

/home/mscastanho/src/binutils-gdb/gold/merge.h:283:7:   required from here
/home/mscastanho/usr/include/c++/12.0.0/bits/hashtable.h:487:49: error: use of
deleted function ‘std::_Enable_special_members<false, true, true, true, true,
true, std::__detail::_Hash_node_base>::_Enable_special_members()’
  487 |         __hashtable_alloc(__node_alloc_type(__a))
      |                                                 ^
In file included from
/home/mscastanho/usr/include/c++/12.0.0/bits/hashtable.h:36,
                 from /home/mscastanho/usr/include/c++/12.0.0/unordered_set:46,
                 from /home/mscastanho/src/binutils-gdb/gold/system.h:68,
                 from /home/mscastanho/src/binutils-gdb/gold/gold.h:35,
                 from /home/mscastanho/src/binutils-gdb/gold/ehframe.cc:23:
/home/mscastanho/usr/include/c++/12.0.0/bits/enable_special_members.h:99:10:
note: ‘std::_Enable_special_members<false, true, true, true, true, true,
std::__detail::_Hash_node_base>::_Enable_special_members()’ is implicitly
deleted because the default definition would be ill-formed:
   99 |   struct _Enable_special_members
      |          ^~~~~~~~~~~~~~~~~~~~~~~
/home/mscastanho/usr/include/c++/12.0.0/bits/enable_special_members.h:99:10:
error: use of deleted function ‘constexpr
std::_Enable_default_constructor<false, _Tag>::_Enable_default_constructor()
[with _Tag = std::__detail::_Hash_node_base]’
/home/mscastanho/usr/include/c++/12.0.0/bits/enable_special_members.h:112:15:
note: declared here
  112 |     constexpr _Enable_default_constructor() noexcept = delete;
      |               ^~~~~~~~~~~~~~~~~~~~~~~~~~~


This is likely related to GCC commit:

commit 89ec3b67dbe856a447d068b053bc19559f136f43
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Jul 20 15:20:41 2021 +0100

    libstdc++: fix is_default_constructible for hash containers [PR 100863]

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