> Empty structs are supported in clang; I think it's a GCC extension to C. Indee... | Hacker News

Hacker Newsnew | past | comments | ask | show | jobs | submit

		Someone 57 days ago \| parent \| context \| favorite \| on: System.LongBool > 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-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++.

kragen 57 days ago [–]

Thanks! Yes, C++ requires all objects to have a nonzero size.

In GCC these two variables get the same address; also true in clang with -O.

Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact