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The warning was produced by following sequence, given an istream_iterator<char> it, such that *it will result in hitting EoF in it->_M_get(), and thus clearing _M_sbuf, the subsequent call to ++it, will result in _M_sbuf->sbumpc() call on null pointer. This is however an false-positive, as in such situation it == istream_iteator() returns true, and the iterator should not be incremented in first place. This patch sliences the issue, by disabling the "-Wnull-dereference" using GCC diagnostic pragmas. To work correctly the pragmas needs to be placed around streambuf functions on which the issue originating from istreambuf_iterator are reported. PR libstdc++/105580 libstdc++-v3/ChangeLog: * include/std/streambuf (streambuf::gptr, streambuf::egptr) (streambuf::gbump): Surround with pragma disabling -Wnull-dereference. * testsuite/24_iterators/istreambuf_iterator/105580.cc: Remove check for warning being emitted. Reviewed-by: Jonathan Wakely <jwakely@redhat.com> Signed-off-by: Tomasz Kamiński <tkaminsk@redhat.com>
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