Arm C Language Extensions

About this document

The Arm C Language Extensions specifies the Arm C Language Extensions (ACLE) to enable C/C++ programmers to exploit the Arm architecture with minimal restrictions on source code portability.

About the license

As identified more fully in the LICENSE file, this project is licensed under CC-BY-SA-4.0 along with an additional patent license. The language in the additional patent license is largely identical to that in Apache-2.0 (specifically, Section 3 of Apache-2.0 as reflected at with two exceptions.

First, several changes were made related to the defined terms so as to reflect the fact that such defined terms need to align with the terminology in CC-BY-SA-4.0 rather than Apache-2.0 (e.g., changing “Work” to “Licensed Material”).

Second, the defensive termination clause was changed such that the scope of defensive termination applies to “any licenses granted to You” (rather than “any patent licenses granted to You”). This change is intended to help maintain a healthy ecosystem by providing additional protection to the community against patent litigation claims.

Defects report

Please report defects in the Arm C Language Extensions to the issue tracker page on GitHub.