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Assert that sysroot ABI version matches exactly

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Otherwise, fall back to the multi ABI scheme, except in testing, where
it becomes a hard error.

This should make it possible to use a rustup-provided rust-analyzer with
proc macro dylibs compiled by older rustcs, and it'll also catch changes
to the format of `rustc --version` or the `.rustc` section that would
make them impossible to compare for equality.
This commit is contained in:
Amos Wenger 2022-07-21 13:13:24 +02:00
parent 480f555334
commit fdddd83224
5 changed files with 62 additions and 9 deletions
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2
crates/proc-macro-api/src/version.rs
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@ -102,7 +102,7 @@ fn read_section<'a>(dylib_binary: &'a [u8], section_name: &str) -> io::Result<&'
/// * [some more bytes that we don't really care but about still there] :-)
/// Check this issue for more about the bytes layout:
/// <https://github.com/rust-lang/rust-analyzer/issues/6174>
fn read_version(dylib_path: &AbsPath) -> io::Result<String> {
pub fn read_version(dylib_path: &AbsPath) -> io::Result<String> {
let dylib_file = File::open(dylib_path)?;
let dylib_mmaped = unsafe { Mmap::map(&dylib_file) }?;