Compiler and language features support documentation

Hi everyone,

I'm a bit confused about figuring out the right documentation to read. The doc available here seems to be only about the non GNU toolchain right ? : https://developer.arm.com/documentation/search/5eec717fe24a5e02d07b26d8

I looked around the official GCC website however I can't find arm documentation.

I'm looking for language features support...

Regards,

Hugo

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