https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63622
--- Comment #18 from howarth at bromo dot med.uc.edu --- Interestingly, these errors don't occur if the compilation of libstdc++-v3/src/c++11/streambuf-inst.cc is done at -O0, -O1 or if -fno-ipa-icf is appended at -O2 or higher.
