RealView Compilation Tools - ARM Information Center

Compiler Command-line Options
2.1.147 --show_cmdline
This option shows how the command-line options are processed.
The commands are shown in their preferred form, and the contents of any via files are
expanded.
See also
• -Aopt on page 2-2
• -Lopt on page 2-79
• --via=filename on page 2-132.
2.1.148 --signed_bitfields, --unsigned_bitfields
This option 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
--tranlsate_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 to be treated as a signed bitfield.
See also
• --arm_linux_config_file=path on page 2-10
• --arm_linux_configure on page 2-12
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