RealView Compiler Reference Guide
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RealView Compiler Reference Guide

Compiler Command-line Options

Language Extensions

Preprocessor extensions

C99 language features available in C90

Subscripting struct

Flexible array members

C99 language features available in C++ and C90

Variadic macros

Standard C language extensions

Constant expressions

Array and pointer extensions

Block scope function declarations

Dollar signs in identifiers

Top‑level declarations

Benign redeclarations

External entities

Function prototypes

Standard C++ language extensions

Declaration of a class member

Read/write constants

Scalar type constants

Type conversions

Standard C and standard C++ language extensions

Address of a register variable

Arguments to functions

Anonymous classes, structures and unions

Assembler labels

Empty declaration

Hexadecimal floating‑point constants

Incomplete enums

Integral type extensions

Label definitions

Non static local variables

Structure, union, enum, and bitfield extensions

GNU language extensions

Alternate keywords

Cast of a union

Character escape sequences

Compound literals

Designated inits

Extended lvalues

Pointer arithmetic

Statement expressions

Compiler-specific Features

C and C++ Implementation Details

Via File Syntax

Standard C Implementation Definition

Standard C++ Implementation Definition

C and C++ Compiler Implementation Limits

Language Extensions

RealView^® Compilation Tools for μVision Compiler Reference Guide

Version 3.1

Home > Language Extensions

Chapter 3. Language Extensions

Table of Contents

3.1. Preprocessor extensions

3.1.1. #assert
3.1.2. #include_next
3.1.3. #unassert
3.1.4. #warning

3.2. C99 language features available in C90

3.2.1. // comments
3.2.2. Subscripting struct
3.2.3. Flexible array members

3.3. C99 language features available in C++ and C90

3.3.1. Variadic macros
3.3.2. long long
3.3.3. restrict
3.3.4. Hex floats

3.4. Standard C language extensions

3.4.1. Constant expressions
3.4.2. Array and pointer extensions
3.4.3. Block scope function declarations
3.4.4. Dollar signs in identifiers
3.4.5. Top‑level declarations
3.4.6. Benign redeclarations
3.4.7. External entities
3.4.8. Function prototypes

3.5. Standard C++ language extensions

3.5.1. ? operator
3.5.2. Declaration of a class member
3.5.3. friend
3.5.4. Read/write constants
3.5.5. Scalar type constants
3.5.6. Type conversions

3.6. Standard C and standard C++ language extensions

3.6.1. Address of a register variable
3.6.2. Arguments to functions
3.6.3. Anonymous classes, structures and unions
3.6.4. Assembler labels
3.6.5. Empty declaration
3.6.6. Hexadecimal floating‑point constants
3.6.7. Incomplete enums
3.6.8. Integral type extensions
3.6.9. Label definitions
3.6.10. Long float
3.6.11. Non static local variables
3.6.12. Structure, union, enum, and bitfield extensions

3.7. GNU language extensions

3.7.1. Alternate keywords
3.7.2. asm keyword
3.7.3. Case ranges
3.7.4. Cast of a union
3.7.5. Character escape sequences
3.7.6. Compound literals
3.7.7. Designated inits
3.7.8. Conditionals
3.7.9. Initializers
3.7.10. Inline
3.7.11. Extended lvalues
3.7.12. Pointer arithmetic
3.7.13. Statement expressions
3.7.14. Unnamed fields

This chapter describes the language extensions supported by the ARM compiler, and includes:

For additional reference material on the ARM compiler see also:

Copyright © 2007 ARM Limited. All rights reserved.	ARM DUI 0376A
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