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bsd.sys.mk: Disable -Wdangling-reference for GCC 13+
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()); | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~ Reviewed by: imp, emaste Differential Revision: https://reviews.freebsd.org/D42579
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@ -234,6 +234,13 @@ CXXWARNFLAGS+= -Wno-literal-suffix \
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-Wno-error=unknown-pragmas
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.endif
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# GCC 13.1.0
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.if ${COMPILER_VERSION} >= 130100
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# These warnings are raised by headers in libc++ so are disabled
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# globally for all C++
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CXXWARNFLAGS+= -Wno-dangling-reference
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.endif
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# GCC produces false positives for functions that switch on an
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# enum (GCC bug 87950)
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CWARNFLAGS+= -Wno-return-type
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