Changes the default allocation order.
#pragma bfield_lsbit_first on | off | reset
on
By default, during bitfield allocation, bits are allocated from the least significant to the most significant one, in the order of declaration (that is, the first declared bitfield will be leftmost in the allocation unit).
Its functionality is equivalent to that of command line option,
-[no]bfield_lsbit_first
For more information, refer to the topic -[no]bfield_lsbit_first.