When the following error message is generated:
... warning #6380: The structure length is not a multiple of its largest element; could create misalignments for arrays of this type. [...]
I think it would be helpful to provide the missing information, such as:
... warning #6380: The structure length (nnn) is not a multiple of its largest element (mmm); could create misalignments for arrays of this type. [...]
Jim Dempse