[RFC] RTEMS Waf Clang support

[Sebastian Huber]

On 16/03/2020 12:39, Hesham Almatary wrote:

> Hi Sebastian,
>
> I have pushed a few commits to my repo to support building RTEMS with
> Clang/LLVM for RISC-V. Here are the changes [1]. Since I'm still
> learning about Waf and the build system, I'd appreciate your input.
> Most importantly, I want to know what's the right way to set "target"
> and "xlen" variables.
>
> [1] https://github.com/CTSRD-CHERI/rtems/compare/967b62464bf39602f8b0f2baf57617ad74c3643d...aa73f72b929856efdb41f9f8582263b5395a3276

You need a new option, e.g.

spec/build/cpukit/RTEMS-BUILD-CPUKIT-OPTXLEN.yml

It should be enabled by clang and riscv:

enabled-by:
   and:
   - clang
   - riscv

The option must be evaluated before the tool settings:

order: -1000