I tried this code:

./x build

download-ci-llvm in config.toml is not specified explicitly, the default value is used.

I expected to see this happen:

• LLVM is downloaded from CI, when LLVM version is bumped the new LLVM is downloaded from CI as well.

Instead, this happened:

• LLVM starts building from source code after an LLVM update, instead of being downloaded, unless I remove the build directory and do a fresh build, then it starts downloading from CI again.

Meta

rustc --version --verbose:

$ ./build/x86_64-pc-windows-gnu/stage0/bin/rustc --version --verbose
rustc 1.78.0-beta.1 (efd9d2df1 2024-03-18)
binary: rustc
commit-hash: efd9d2df12b5e17fac0b4d0fb89f612ecd79f259
commit-date: 2024-03-18
host: x86_64-pc-windows-gnu
release: 1.78.0-beta.1
LLVM version: 18.1.2