Add llvm-version arg

[SergioGasquez]

No description provided.

[SergioGasquez]

A few notes on LLVM 15 after some testing:

• All the targets are using minified LLVM by default, except x86_64-unknown-linux
• minified LLVM 15 does not have all the necessary files to build esp-idf projects, its missing libLLVM-15.so
• In Windows, libs are compressed in .zip while complete is .tar.xz

[MabezDev]

Perhaps this should be named clang version? AFAIK, and based on @JurajSadel's testing this will not change the LLVM version used by the Rust compiler, but instead the version of clang (I think). Is this the intention?

[SergioGasquez]

Perhaps this should be named clang version? AFAIK, and based on @JurajSadel's testing this will not change the LLVM version used by the Rust compiler, but instead the version of clang (I think). Is this the intention?

It is supposed to change the LLVM version, AFAIK. Either rustc is not picking it correctly or I am doing something wrong, but I am installing the latest release of LLVM 15 instead of LLVM 14 (minified or complete).