aarch64-elf with FSF GNAT

[robdaemon]

In light of the recent announcement of the EOL of GNAT Community, it would be great to be able to build these runtimes against FSF GNAT.

This would mean including rts_sources.json and other applicable files in the GCC tree (or even here, in this repo)

This repo has a Raspberry Pi 3, AArch64 RTS in it, but it hasn't been possible to build it as GNAT Community never provided an AArch64 build.

[Fabien-Chouteau]

Hello @robdaemon, the intent of this repository is mostly to support the addition of new board support package (BSP) for the targets supported by GNAT Community (arm-elf and RISC-V). Now that GNAT Community is discontinued, you can achieve the same with the GNAT FSF release provided by Alire.

At this point we do not plan to enable the support of targets that were not previously available in GNAT Community, like aarch64-elf.

[dinkelk]

Now that GNAT Community is discontinued, you can achieve the same with the GNAT FSF release provided by Alire.

Is there any documentation available on how to build these runtimes against the Alire GNAT FSF releases? Using the normal ./build_rts.py method doesn't seem to work with the way the Alire packages are set up. It cannot find a rts-sources.json file. Is there a different method?

[Fabien-Chouteau]

Right now you have to use the corresponding gnat-fsf-XX branch from from this fork: https://github.com/Fabien-Chouteau/bb-runtimes It contains rts-sources.json and the required sources.

For instance with GNAT FSF arm-elf 12:

./build_rts.py --rts-src-descriptor=gnat_rts_sources/lib/gnat/rts-sources.json --output=temp_build_rts --force --build stm32f4 tms570 lm3s rpi-pico rpi-pico-smp

[dinkelk]

@Fabien-Chouteau - Thank you, that works!