C/C++ Indexer and compilers - C23 support?

[Artur Laskowski]

Hi,

I want to know when the C/C++ Indexer will be updated to the latest C standard, that is, C23? I want to use some new language features, like double square brackets for attributes, but it still shows a syntax error, even though the code compiles without problems.

Also, I would like to know when GCC 15 will be available.

Best regards,
Artur

[Aimen1 · Accepted solution]

Hello @Artur Laskowski 

The C23 syntax support is already tracked under this internal ticket number 220188 for follow-up.

Regarding GCC15, it is expected to be supported by November 2026. 

Regards.

Aimen

[Artur Laskowski]

Good to hear that, thanks

[gbm]

Maybe a good starting point would be the explicit support for C23 in the compiler language dialect tab. So far we need to set the dialect to GNU default, then manually add the option -std=c23, which is not very convenient.

[Andrew Neil]

Note that this is a well-known feature of the Eclipse* Indexer - not specific to CubeIDE

C23 support

C23 syntax highlighting in STM32CubeIDE (e.g. constexpr)

STM32CubeIDE Indexer: False Positive Syntax Error with C11 _Generic

Defining enum type compiles ok, but STM32CubeIDE flags syntax error

CubeIDE incorrectly flags __attribute__((fallthrough)) as syntax error

etc, etc, ...

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* In fact, not just Eclipse - it also happens in other IDEs.

[Artur Laskowski]

Yeah, I know. But even if one is publishing the IDE based on a third-party framework, it would be nice if all its components were up to date and worked properly. Otherwise, the comfort of programming and the quality of the code are hard to sustain.