[PATCH] rust: Support latest version of `rust-anayzer`

[Sarthak Singh <sarthak.singh99@gmail.com>]

Sets the `sysroot` field in rust-project.json which is now needed in
newer versions of rust-anaylzer instead of the `sysroot_src` field.

`sysroot` over `sysroot_src` has been working since rust 1.74.0 (which
was released on Nov 16, 2023). Since we are going to target rust 1.78.0
going forward we should set `sysroot` to support all currently used and
future versions of rust-analyzer.

Code editors like VS Code try to use the latest version of rust-analyzer
(which is updated every week) instead of the version of rust-analyzer
that comes with the rustup toolchain (which is updated every six weeks
along with the rust version).

Without this change rust-analyzer is breaking for anyone using VS Code.

Signed-off-by: Sarthak Singh <ss269@uw.edu>
---
 rust/Makefile                     | 2 +-
 scripts/generate_rust_analyzer.py | 6 +++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/rust/Makefile b/rust/Makefile
index bf05e65365da..e3d0ba099b18 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -350,7 +350,7 @@ rust-analyzer:
 	$(Q)$(srctree)/scripts/generate_rust_analyzer.py \
 		--cfgs='core=$(core-cfgs)' --cfgs='alloc=$(alloc-cfgs)' \
 		$(realpath $(srctree)) $(realpath $(objtree)) \
-		$(RUST_LIB_SRC) $(KBUILD_EXTMOD) > \
+		$(rustc_sysroot) $(RUST_LIB_SRC) $(KBUILD_EXTMOD) > \
 		$(if $(KBUILD_EXTMOD),$(extmod_prefix),$(objtree))/rust-project.json
 
 redirect-intrinsics = \
diff --git a/scripts/generate_rust_analyzer.py b/scripts/generate_rust_analyzer.py
index f270c7b0cf34..8529c3940136 100755
--- a/scripts/generate_rust_analyzer.py
+++ b/scripts/generate_rust_analyzer.py
@@ -145,6 +145,7 @@ def main():
     parser.add_argument('--cfgs', action='append', default=[])
     parser.add_argument("srctree", type=pathlib.Path)
     parser.add_argument("objtree", type=pathlib.Path)
+    parser.add_argument("sysroot", type=pathlib.Path)
     parser.add_argument("sysroot_src", type=pathlib.Path)
     parser.add_argument("exttree", type=pathlib.Path, nargs="?")
     args = parser.parse_args()
@@ -154,9 +155,12 @@ def main():
         level=logging.INFO if args.verbose else logging.WARNING
     )
 
+    # Making sure that the sysroot and sysroot_src belong to the same toolchain
+    assert args.sysroot in args.sysroot_src.parents
+
     rust_project = {
         "crates": generate_crates(args.srctree, args.objtree, args.sysroot_src, args.exttree, args.cfgs),
-        "sysroot_src": str(args.sysroot_src),
+        "sysroot": str(args.sysroot),
     }
 
     json.dump(rust_project, sys.stdout, sort_keys=True, indent=4)
-- 
2.45.2