https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108342
--- Comment #10 from Rui Oliveira <ruilvo at ua dot pt> --- So my options are to create like a placeholder, say ```c typedef struct __attribute__((__packed__)) // Packed isn't really necessary here I think? { float re, im; } ph_fcomplex_t ``` To silence the warning and get packing to work, and trust [complex.numbers.general] for a reinterpret_cast into std::complex<float> I guess.