7.117 --narrow_volatile_bitfields

Accesses volatile bitfields using the smallest access size that contains the entire bitfield.

The AEABI specifies that volatile bitfields are accessed as the size of their container type. However, some versions of GCC instead use the smallest access size that contains the entire bitfield. --narrow_volatile_bitfields emulates this non-AEABI compliant behavior.
Related information
Application Binary Interface (ABI) for the ARM Architecture
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