[Bug gold/28417] New: std::string no longer allows accepting nullptr_t since it is undefined behavior after yesterday's change on libstdc++.

[euloanty at live dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28417

            Bug ID: 28417
           Summary: std::string no longer allows accepting nullptr_t since
                    it is undefined behavior after yesterday's change on
                    libstdc++.
           Product: binutils
           Version: 2.38 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gold
          Assignee: ccoutant at gmail dot com
          Reporter: euloanty at live dot com
                CC: ian at airs dot com
  Target Milestone: ---

../../../../binutils-gdb/gold/options.h: In constructor
'gold::Search_directory::Search_directory()':
../../../../binutils-gdb/gold/options.h:614:7: error: use of deleted function
'std::__cxx11::basic_string<_CharT, _Traits,
_Alloc>::basic_string(std::nullptr_t) [with _CharT = char; _Traits =
std::char_traits<char>; _Alloc = std::allocator<char>; std::nullptr_t =
std::nullptr_t]'
  614 |     : name_(NULL), put_in_sysroot_(false), is_in_sysroot_(false)
      |       ^~~~~~~~~~~
libtool: link: x86_64-w64-mingw32-gcc -W -Wall -Wstrict-prototypes
-Wmissing-prototypes -Wshadow -Wstack-usage=262144
-I../../../../binutils-gdb/binutils/../zlib -g -O2 -Wl,--stack -Wl,12582912 -o
.libs/bfdtest2.exe bfdtest2.o  ../bfd/.libs/libbfd.a
-L/home/cqwrteur/myhome/gcc_build/glibc231_win_canadian/binutils-gdb/zlib -lz
../libiberty/libiberty.a
In file included from
/home/cqwrteur/cross/x86_64-w64-mingw32/x86_64-w64-mingw32/include/c++/12.0.0/string:53,
                 from ../../../../binutils-gdb/gold/expression.cc:25:

std::string str(nullptr); was considered undefined behavior, Now it is
forbidden by ISO C++ standard since C++23. libstdc++ has updated this behavior.


https://github.com/gcc-mirror/gcc/commit/cf876562c592193732f869e9f96034a42d0fad89#diff-ba6ba5a2bddd4d1cf66ef3699e6111d9c6aa1cf0192c97e6d59a048b4a851b91


See Jonathan Wakely's words

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