Re: [Buildroot] Overriding Kconfig Values from external br2

[Arnout Vandecappelle <arnout@mind.be>]

On 05/01/2022 20:03, Jesse Millwood wrote:
> Hello,
> 
> I have an external C/C++ toolchain that I've put together that uses MUSL. I've 
> also built an external Rust toolchain that uses my MUSL toolchain.
> 
> My issue is that there is a Rust Kconfig variable that specifies if a specific 
> architecture supports Rust.
> 
> The Kconfig variable in question is BR2_PACKAGE_HOST_RUSTC_TARGET_ARCH_SUPPORTS 
> in package/rustc/Config.in.host.

[snip]

> You may notice that I changed the libc depends line to be or'd with 
> BR2_TOOLCHAIN_USES_MUSL. It seems that this does not get considered when I 
> choose my external musl toolchain option. In the menuconfig when I search for 
> the BR2_PACKAGE_HOST_RUSTC_TARGET_ARCH_SUPPORTS variable with the "/" key it 
> looks like it is only getting it from the original file. Does buildroot have a 
> mechanism for overwriting this kind of setting and if not, does anyone have an 
> idea of how I would accomplish what I am trying to do (make buildroot honor my 
> external rust toolchain)?

  No, there's no way to override the dependencies of an existing Config.in 
symbol in an external.

  However, this was corrected in upstream Buildroot in commit 
d69d40c029dc7d8199b745eaee759d92b66c5d17. So you can try to backport that commit 
instead, or just update Buildroot to something more recent.

  Regards,
  Arnout


> 
> Thanks,
> Jesse
> 
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