vad authored Nov 18, 2025 and vad committed Dec 28, 2025

`CXXSTDLIB` is used by cc-rs[0] and is de-facto a standard, so honor it
it to avoid confusion. Keep supporting `LLVM_SYS_LIBCPP` to avoid
breaking existing workflows.

[0] https://docs.rs/cc/1.2.46/src/cc/lib.rs.html#3195

build: Rename `LLVM_SYS_LIBCPP` variable to `CXXSTDLIB`

See merge request !57

It's a little clearer to combine these cases, if ever so slightly less
efficient at runtime to use .or().

Since the API changes are based on LLVM 22.1.0-rc1, this is currently
tagged as a prerelase (-rc1) crate.

Update for LLVM 22

See merge request !58

There were no C API changes between LLVM 22.1.0-rc1 and 22.1.0.