https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108759
Arthur O'Dwyer <arthur.j.odwyer at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |arthur.j.odwyer at gmail dot com --- Comment #2 from Arthur O'Dwyer <arthur.j.odwyer at gmail dot com> --- I believe what I'm going to say is simply a duplicate of Davis's report, but just in case it's different, I'll add mine here. This is a slightly modified version of the example from [class.copy.elision], merely modified so that g() returns a C++17 prvalue instead of relying on NRVO/copy-elision. Original example: https://eel.is/c++draft/class.copy.elision#2 Modified example: // https://godbolt.org/z/n43jPs1Kj struct A { void *p; constexpr A(): p(this) {} }; constexpr A g() { return A(); } constexpr A b = g(); // well-formed, b.p points to b static_assert(b.p == &b); MSVC and Clang accept. GCC incorrectly rejects: <source>:11:19: error: 'A{((void*)(&<anonymous>))}' is not a constant expression 11 | constexpr A b = g(); // well-formed, b.p points to b | ^ <source>:12:19: error: non-constant condition for static assertion 12 | static_assert(b.p == &b); | ~~~~^~~~~