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Compile arm-none-eabi 11 from source

Hi,

I want to rebuild the newest GCC 11.2 toolchain for my project as I want to introduce some space optimization flags.

On the GCC 10.3 release the process was pretty straightforward as the source code included the build-toolchain.sh script.

On the 11.2 release I didn't find such script anymore. There is a linaro abe manifest on https://developer.arm.com/-/media/Files/downloads/gnu/11.2-2022.02/manifest/gcc-arm-arm-none-eabi-abe-manifest.txt, which also differs from the incomplete 11.2-2022.02-x86_64-arm-none-eabi-manifest.txt file included in the toolchain tar from https://developer.arm.com/-/media/Files/downloads/gnu/11.2-2022.02/binrel/gcc-arm-11.2-2022.02-x86_64-arm-none-eabi.tar.xz

Could you give me some pointers on how to reproduce the release build so I can add the appropriate flags?

Thanks in advance!