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bsd.sys.mk: Disable -Wdangling-reference for GCC 13+
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Authored by jhb on Nov 13 2023, 10:29 PM.
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Details

Summary

GCC raises this warning for libc++'s istream. It raises false
positives in other cases as well (GCC bugs 109640, 109642, 109671).

Warning from <istream>:

/usr/include/c++/v1/istream:1464:34: error: possibly dangling reference to a temporary [-Werror=dangling-reference]
1464 | const ctype<_CharT>& ct = std::use_facet<ctype<_CharT> >(is.getloc());

|                                  ^~~~

/usr/include/c++/v1/istream:1464:71: note: the temporary was destroyed at the end of the full expression 'std::1::use_facet<ctype<char> >(std::1::ios_base::getloc() const())'
1464 | const ctype<_CharT>& ct = std::use_facet<ctype<_CharT> >(is.getloc());

|                                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~

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rG FreeBSD src repository
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