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doc: add SPDX information to coding convenstions

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krzysztof-cabaj 2025-07-31 19:31:58 +02:00
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CODING_CONVENTIONS.md
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@ -390,7 +390,7 @@ Wrong:
## Documentation ## Documentation
* All documentation must be in English. * All documentation must be in English.
* All files contain the copyright note and the author. * All files have to contain the copyright and the author note in the SPDX format.
* Doxygen documentation is mandatory for all header files. * Doxygen documentation is mandatory for all header files.
* Every header file includes a general description about the provided * Every header file includes a general description about the provided
functionality. functionality.
@ -400,11 +400,8 @@ An exemplary doxygen documentation in a header file can look like this.
``` ```
/* /*
* Copyright (C) 2014 Peter Schmerzl <peter@schmerzl-os.org> * SPDX-FileCopyrightText: 2014 Peter Schmerzl <peter@schmerzl-os.org>
* * SPDX-License-Identifier: LGPL-2.1-only
* This file is subject to the terms and conditions of the GNU Lesser General
* Public License v2.1. See the file LICENSE in the top level directory for more
* details.
*/ */
/** /**
@ -431,6 +428,42 @@ An exemplary doxygen documentation in a header file can look like this.
int set_foobar(int state, int *old_state); int set_foobar(int state, int *old_state);
``` ```
### SPDX
SPDX (System Package Data Exchange) is an open standard for adding
information about licenses, security information or other metadata to source files.
It allows for easy, automatic generation of SBOMs (Software Bill of Materials).
RIOT used to use the standard copyright format in a long form, however this
adds a lot of boilerplate code without much benefit. Furthermore the copyright
notices tend to vary depending on the author, making it difficult to parse
automatically and reliably.
Old Style - License Information:
```
/*
* Copyright (C) 2013, 2014 INRIA
* 2015 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
```
New Style - SPDX Format:
```
/*
* SPDX-FileCopyrightText: 2013-2014 INRIA
* SPDX-FileCopyrightText: 2015 Freie Universität Berlin
* SPDX-License-Identifier: LGPL-2.1-only
*/
```
More information concerning the transition to SPDX format can be found
[here](https://github.com/RIOT-OS/RIOT/issues/21515).
## Common compilation warnings ## Common compilation warnings
Some solutions to correctly handle compilation warnings. Some solutions to correctly handle compilation warnings.