[Bug libstdc++/103848] [11/12 Regression] std::deque<>::iterator operator- uses "0" for nullptr check, triggers "zero-as-null-pointer-constant" warning

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103848

--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Either that isn't the correct g++ command, or something in the code you're
compiling uses "#pragma GCC diagnostic error ..." to enable the warning.

There is no way to get an *error* from a non-default warning in a system header
otherwise.