RealView Compilation Tools Compiler Reference Guide - ARM ...

Compiler Command-line Options
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.
2.1.108 --[un]signed_chars
This option makes the char type signed or unsigned.
When char is signed, the macro __FEATURE_SIGNED_CHAR is defined by the compiler.
Note
Care must be taken when mixing translation units that have been compiled with and
without this option, and that share interfaces or data structures.
The ARM ABI defines char as an unsigned byte, and this is the interpretation used by
the C++ libraries supplied with RVCT.
Default
The default is --unsigned_chars.
See also
• Predefined macros on page 4-103.
2.1.109 --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.
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