https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98572
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |DUPLICATE --- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- >Integer types smaller than int are promoted when an operation is performed on >them. >From that same web page. (and is true for C standard too). bit-fields have a different type than the original defined types (in GCC C), they have a type which has the same number of bits as what you define it as there for it is considered smaller than int and therefor is promoted to int. See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88731#c2 . *** This bug has been marked as a duplicate of bug 88731 ***