https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105580
--- Comment #17 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-14 branch has been updated by Tomasz Kaminski <[email protected]>: https://gcc.gnu.org/g:f3cc27ebebb83eb3c69d94b56ad5dd89414c14ed commit r14-12431-gf3cc27ebebb83eb3c69d94b56ad5dd89414c14ed Author: Tomasz KamiÅski <[email protected]> Date: Fri Feb 27 19:55:19 2026 +0100 libstdc++: Add #pragma to slience null-dereference warning in istreambuf_iterator::operator++ [PR105580] 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: New test. Reviewed-by: Jonathan Wakely <[email protected]> Signed-off-by: Tomasz KamiÅski <[email protected]> (cherry picked from commits 8758503918a91dacff4dbc7126eced21787fbfc9 bfc2b87f8244a13ab00e8e3fe2af1d6d18fcaa36 a523d1ecc89dcb7ea205e3de22d00443d4a0d91d)
