https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105651
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Component|c++ |tree-optimization Known to fail| |11.1.0, 12.1.0, 13.0 Summary|Failure compiling |bogus "may overlap" memcpy |constexpr/__builtin_memcpy |warning with std::string |on Cygwin with -std=c++20 | Target| |x86_64-pc-cygwin Keywords| |diagnostic --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- > Builds on gcc-11,12,13 with -std=c++17, but all three fail with c++20. std::string changes slightly with C++20 and IIRC more inlining happens which is why the warning happens only with -std=c++20.