[Bug tree-optimization/109732] [14 regression] gcc miscompiles iterator comparison on nlohmann_json since r14-204-gf1f5cbaa3f716f

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109732

--- Comment #3 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
Both -O1 and -fno-strict-aliasing remove the bug:

    $ g++-14 unit-t.cpp -O2 -Ijson/include -o a -O1 && ./a
    SUCCESS!
    $ g++-14 unit-t.cpp -O2 -Ijson/include -o a -fno-strict-aliasing && ./a
    SUCCESS!