https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66337
David Edelsohn <dje at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target|powerpc*-*-*-* |powerpc*-*-* --- Comment #7 from David Edelsohn <dje at gcc dot gnu.org> --- I agree that changing the alignment to make the __alignof__ output happy is wrong. The "bug" is __alignof__ output on XLC and GCC are different, despite the actual alignment of the structure and member. The ADJUST_FIELD_ALIGN computation is correct and I don't believe that GCC structure layout provides control to describe the alignment of the first member different than other members of a structure.