Quadword alignment using SECTALGN(16) is supported with OBJ if you are linking on z/OS, using the Binder. It uses special ESD type codes for quadword aligned sections. As it is not always supported, specifying it with OBJ will produce warning ASMA216W, which can be suppressed using SUPRWARN(216).
Note that warning ASMA500W cannot safely be ignored before APAR PH40885 because the assembler incorrectly treated it internally as an error and did not generate the affected statement. Jonathan Scott, HLASM IBM Hursley, UK
