Re: [PATCH] kbuild: rust: add `CONFIG_RUSTC_LLVM_VERSION`

[Gary Guo]

On Fri, 11 Oct 2024 13:53:47 +0200
Miguel Ojeda <miguel.ojeda.sandonis@xxxxxxxxx> wrote:

> On Fri, Oct 11, 2024 at 1:41 PM Gary Guo <gary@xxxxxxxxxxx> wrote:
> >
> > The invocation of rustc-version is being moved from init/Kconfig to
> > scripts/Kconfig.include for consistency with cc-version.  
> 
> Yeah, I am ambivalent. Dropping them would minimize changes and avoid
> introducing something only used once, which would be nice too. Happy
> either way.
> 

Another motivation is that in my helper inline series, I need to do
arithmetic on LLVM version (divide it by 10000 to get major verison),
which isn't possible for config options, but will work for variables
defiend in Kconfig.include.

I didn't mention it in the commit message for this patch because this
is not my patch series :)

Best,
Gary

> > +if output=$("$@" --version --verbose 2>/dev/null | grep LLVM); then  
> 
> Similarly, I wonder if we should use '^LLVM version: ' here or similar
> to minimize the chances the "LLVM" string appears elsewhere in the
> future (perhaps in a custom string a vendor adds, though I would
> expect them to add it lowercase). We are relying on having a $3 when
> splitting anyway.
> 
> Depending on what Masahiro prefers, I will take this one or the
> one-invocation-only one.
> 
> Thanks Gary!
> 
> Cheers,
> Miguel