--signed_bitfields, --unsigned_bitfields
Makes bitfields of type int signed or unsigned.
The C Standard specifies that if the type specifier used in declaring a
bitfield is either int, or a typedef name defined as int, then whether the bitfield is
signed or unsigned is dependent on the implementation.
Default
The default is --unsigned_bitfields. However, if you specify an ARM Linux configuration file on
the command line and you use --translate_gcc or --translate_g++, the default is --signed_bitfields.
Note
The AAPCS requirement for bitfields to default to unsigned on ARM, is relaxed in version 2.03 of the standard.
Example
typedef int integer;
struct
{
integer x : 1;
} bf;
Compiling this code with --signed_bitfields causes x to be treated as a
signed bitfield.