RealView Compilation Tools Essentials Guide: A.2. Differences between RVCT v2.2 SP1 and RVCT v2.2

A.2. Differences between RVCT v2.2 SP1 and RVCT v2.2

This section describes the differences between RVCT v2.2 delivered with RVDS v2.2 Service Pack 1 (SP1) and the previous release.

The differences were:

RVCT v2.2 SP1 includes support for the ARM1136J(F)-S-rev-1 core. To see a full list of supported cores use:
```
armcc --cpu list
```
The ARM linker offers new options when building shared objects, that is, use:
- --pt_arm_exidx to create a PT_ARM_EXIDX program header that describes the location of the exception tables. The linker assumes that a shared object containing a PT_ARM_EXIDX program header might throw an exception.
- --force_so_throw to force the linker to assume that all shared objects might throw an exception.
For full details of these command-line options, see the chapter describing System V shared libraries in Linker and Utilities Guide.
The preprocessing directive #warning is supported. This produces a user-defined warning at compilation time but does not halt compilation.
The keywords __restrict and __restrict__ are supported as synonyms for restrict. In this release, both keywords are available in all modes (not just with --restrict).

The deprecated function attribute is supported in both GNU mode and ARM mode:

int Function_Attributes_deprecated_0(int b) __attribute__ ((deprecated));

The fromelf utility now supports a --no_comment_section option, to remove the .comment section from ELF output files.
The storage type selection of the compiler option --enum_is_int has changed. If the range of the enumerator is greater than the range of a signed int, but is within the range of an unsigned int, the storage type of the enum is now unsigned int.
For example:
```
enum E { k = 0x8000000 };               /* is treated as unsigned int */
```
As part of the development of the ARM assembly language, the SWI instruction has been renamed to SVC (SuperVisor Call).
Instructions disassemble to SVC, with a comment to say that this was formerly SWI. For example, fromelf --text -c produces:
```
...
0x00000fbc:    e3a00010    ....    MOV      r0,#0x10
0x00000fc0:    ef123456    V4..    SVC      0x123456 ; formerly SWI
...
```

Copyright © 2002-2007 ARM Limited. All rights reserved.	ARM DUI 0202H
Non-Confidential
PDF version