Re: About the clang/llvm tool chain for AVR

[Emil Fihlman]

There is no reason to replace gcc.

Cheers,

Emil

ma 15. tammik. 2024 klo 7.32 Ben Shi via Discussion of avr-libc development
<avr-libc-dev@nongnu.org> kirjoitti:

> Dear AVR-libc developers,
>
>
> I am current maintainer of the llvm-avr backend, and I would like to ask
> for your feedback on my work. My final goal is making
> clang-llvm-lld-compiler_rt chain fully functional, and let AVR program
> developers get rid of the GNU tool chain. So any complain/concern/report is
> welcome.
>
>
> Current known issues:
>
>
> 1. The clang frontend still does not support float-64 type and int24 type.
> 2. The clang frontend does not support virtual functions in C++ classes.
> 3. The 32-bit mul/div are not supported in compiler-rt, though
> 8-bit/16-bit ones are supported.
> 4. The lld should have support all functionality compared to GNU-ld.
> (There may be bugs, but it should be quite stable.)
> 5. The lld accepts all syntax of GNU linker script, except
> 'KEEP(SORT(*)(.ctors))', so you need to do a little modification to the
> linker scripts distributed within avr-gcc, and use lld style syntax.
> 6. There are still some minor bugs in the llvm backend. (
> https://github.com/llvm/llvm-project/issues?q=is%3Aopen+is%3Aissue+label%3Abackend%3AAVR
> )
>
>
> Generally speaking I have written some simple test programs with the
> clang/llvm/lld chain on Arduino boards, which are stable. So I would ask
> for more tests and reports by you. You can specify lld with command line
> option '-fuse-ld=lld'.
>
>
> You are appreciated to report issues to me at&nbsp;
> https://github.com/llvm/llvm-project/issues, and do not forget to set the
> issue's label to 'backend:avr'.
>
>
> I hope my work can be fully accepted by the aruidno community and finally
> replace the GNU toolchain in its package releases in the future.
>
>
> Best regards,
>
>
> Ben Shi