About this book

The Arm® Compiler Migration and Compatibility Guide provides migration and compatibility information for users moving from older versions of Arm Compiler to Arm Compiler 6.

Using this book

This book is organized into the following chapters:

Chapter 1 Configuration and Support Information

Summarizes the support levels and FlexNet versions supported by the Arm® compilation tools.

Chapter 2 Migrating from Arm® Compiler 5 to Arm® Compiler 6

Provides an overview of the differences between Arm® Compiler 5 and Arm Compiler 6.

Chapter 3 Migrating from armcc to armclang

Compares Arm® Compiler 6 command-line options to older versions of Arm Compiler.

Chapter 4 Compiler Source Code Compatibility

Provides details of source code compatibility between Arm® Compiler 6 and older armcc compiler versions.

Chapter 5 Migrating from armasm to the armclang Integrated Assembler

Describes how to migrate assembly code from armasm syntax to GNU syntax (used by armclang).

Appendix A Code Examples

Provides source code examples for Arm® Compiler 5 and Arm Compiler 6.

Appendix B Licenses

Describes the Apache license.


The Arm® Glossary is a list of terms used in Arm documentation, together with definitions for those terms. The Arm Glossary does not contain terms that are industry standard unless the Arm meaning differs from the generally accepted meaning.

See the Arm® Glossary for more information.

Typographic conventions

Introduces special terminology, denotes cross-references, and citations.
Highlights interface elements, such as menu names. Denotes signal names. Also used for terms in descriptive lists, where appropriate.
Denotes text that you can enter at the keyboard, such as commands, file and program names, and source code.
Denotes a permitted abbreviation for a command or option. You can enter the underlined text instead of the full command or option name.
monospace italic
Denotes arguments to monospace text where the argument is to be replaced by a specific value.
monospace bold
Denotes language keywords when used outside example code.
Encloses replaceable terms for assembler syntax where they appear in code or code fragments. For example:
MRC p15, 0, <Rd>, <CRn>, <CRm>, <Opcode_2>
Used in body text for a few terms that have specific technical meanings, that are defined in the Arm® Glossary. For example, IMPLEMENTATION DEFINED, IMPLEMENTATION SPECIFIC, UNKNOWN, and UNPREDICTABLE.


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