Pin memchr to 2.5.0 in the library rather than rustc_ast

The latest versions of `memchr` experience LTO-related issues when compiling for windows-gnu [1], so needs to be pinned. The issue is present in the standard library. `memchr` has been pinned in `rustc_ast`, but since the workspace was recently split, this pin no longer has any effect on library crates. Resolve this by adding `memchr` as an _unused_ dependency in `std`, pinned to 2.5. Additionally, remove the pin in `rustc_ast` to allow non-library crates to upgrade to the latest version. Link: rust-lang#127890 [1]
qinheping · Sep 24, 2024 · 6d8f5d8 · 6d8f5d8
1 parent 194bbc7
commit 6d8f5d8
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diff --git a/Cargo.lock b/Cargo.lock
diff --git a/std/Cargo.toml b/std/Cargo.toml
@@ -23,6 +23,10 @@ unwind = { path = "../unwind" }
 hashbrown = { version = "0.14", default-features = false, features = [
     'rustc-dep-of-std',
 ] }
+# FIXME(#127890): `object` depends on `memchr`, but `memchr` > v2.5 causes
+# issues with LTO. This dependency is not used directly, but pin it here so
+# it resolves to 2.5. To be removed once rust-lang/rust#127890 is fixed.
+memchr = { version = "=2.5.0", default-features = false, features = ["rustc-dep-of-std"] }
 std_detect = { path = "../stdarch/crates/std_detect", default-features = false, features = [
     'rustc-dep-of-std',
 ] }