Support for bit-fields in structs

OpenCL C s6.9 doesn't allow bit-fields in structs due to portability/interoperability issues between host and device caused by data layouts being implementation-defined and therefore hard to handle in applications.

However, it seems that there is no guarantee of the struct layout anyway in OpenCL particularly resulting in inconsistent alignments b/w host and device. Considering this fact, allowing bit-fileds in structs won't introduce a new problem. Could this be relaxed?

The issue cites OpenCL C §6.9; start by reading that specification section and comparing the current struct-layout rules. Determine whether the restriction should change and what interoperability behavior would need to be documented; no repository file or test is identified.

Written by the indexing model from the issue text.