https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71566
Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |INVALID --- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to denis.campredon from comment #1) > You have to change `[[aligned(16)]]' to `[[gnu::aligned(16)]]' as attribute > aligned is a gnu extension to the standard. Indeed. The warning is telling you that [[aligned(16)]] is not a recognised attribute.