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The vector<bool>::shrink_to_fit() implementation will allocate new storage even if the vector is empty. That then leads to the end-of-storage pointer being non-null and equal to the _M_start._M_p pointer, which means that _M_end_addr() has undefined behaviour. The fix is to stop doing a useless zero-sized allocation in shrink_to_fit(), so that _M_start._M_p and _M_end_of_storage are both null after an empty vector shrinks. Signed-off-by: Jonathan Wakely <jwakely@redhat.com> libstdc++-v3/ChangeLog: PR libstdc++/100153 * include/bits/vector.tcc (vector<bool>::_M_shrink_to_fit()): When size() is zero just deallocate and reset.
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.