> Empty structs are supported in clang; I think it's a GCC extension to C. Indeed. See https://gcc.gnu.org/onlinedocs/gcc-15.2.0/gcc/Empty-Structures.html http

> Empty structs are supported in clang; I think it's a GCC extension to C. Indeed. See https://gcc.gnu.org/onlinedocs/gcc-15.2.0/gcc/Empty-Structures.html https://gcc.gnu.org/onlinedocs/gcc-15.2.0/gcc/Empty-Structur.... That page also says “In C++, empty structures are part of the language”, and “G++ treats empty structures as if they had a single member of type char”. I think that means the size of empty structs differs between GCC C and GCC C++.