[PATCH v2] scripts: generate_rust_analyzer: compile sysroot with correct edition

[Tamir Duberstein <tamird@kernel.org>]

Use `core_edition` for all sysroot crates rather than just core as all
were updated to edition 2024 in Rust 1.87.

Fixes: f4daa80d6be7 ("rust: compile libcore with edition 2024 for 1.87+")
Signed-off-by: Tamir Duberstein <tamird@kernel.org>
---
Changes in v2:
- Revert rust/Makefile changes and add Miguel's analysis.
- Link to v1: https://patch.msgid.link/20260115-rust-analyzer-sysroot-v1-1-4de831df234a@gmail.com
---
 scripts/generate_rust_analyzer.py | 29 ++++++++++++++++++++++++++---
 1 file changed, 26 insertions(+), 3 deletions(-)

diff --git a/scripts/generate_rust_analyzer.py b/scripts/generate_rust_analyzer.py
index 6061bd6e2ebd..187243f7f7a8 100755
--- a/scripts/generate_rust_analyzer.py
+++ b/scripts/generate_rust_analyzer.py
@@ -61,7 +61,6 @@ def generate_crates(srctree, objtree, sysroot_src, external_src, cfgs, core_edit
         display_name,
         deps,
         cfg=[],
-        edition="2021",
     ):
         append_crate(
             display_name,
@@ -69,13 +68,37 @@ def generate_crates(srctree, objtree, sysroot_src, external_src, cfgs, core_edit
             deps,
             cfg,
             is_workspace_member=False,
-            edition=edition,
+            # Miguel Ojeda writes:
+            #
+            # > ... in principle even the sysroot crates may have different
+            # > editions.
+            #
+            # > For instance, in the move to 2024, it seems all happened at once
+            # > in 1.87.0 in these upstream commits:
+            #
+            # >     0e071c2c6a58 ("Migrate core to Rust 2024")
+            # >     f505d4e8e380 ("Migrate alloc to Rust 2024")
+            # >     0b2489c226c3 ("Migrate proc_macro to Rust 2024")
+            # >     993359e70112 ("Migrate std to Rust 2024")
+            #
+            # > But in the previous move to 2021, `std` moved in 1.59.0, while
+            # > the others in 1.60.0:
+            #
+            # >     b656384d8398 ("Update stdlib to the 2021 edition")
+            # >     06a1c14d52a8 ("Switch all libraries to the 2021 edition")
+            #
+            # Link: https://lore.kernel.org/all/CANiq72kd9bHdKaAm=8xCUhSHMy2csyVed69bOc4dXyFAW4sfuw@mail.gmail.com/
+            #
+            # At the time of writing all rust versions we support build the
+            # sysroot crates with the same edition. We may need to relax this
+            # assumption if future edition moves span multiple rust versions.
+            edition=core_edition,
         )
 
     # NB: sysroot crates reexport items from one another so setting up our transitive dependencies
     # here is important for ensuring that rust-analyzer can resolve symbols. The sources of truth
     # for this dependency graph are `(sysroot_src / crate / "Cargo.toml" for crate in crates)`.
-    append_sysroot_crate("core", [], cfg=crates_cfgs.get("core", []), edition=core_edition)
+    append_sysroot_crate("core", [], cfg=crates_cfgs.get("core", []))
     append_sysroot_crate("alloc", ["core"])
     append_sysroot_crate("std", ["alloc", "core"])
     append_sysroot_crate("proc_macro", ["core", "std"])

---
base-commit: 74e15ac34b098934895fd27655d098971d2b43d9
change-id: 20260115-rust-analyzer-sysroot-5fb95aa985d2

Best regards,
--  
Tamir Duberstein <tamird@kernel.org>