kbuild: rust-analyzer: support key-value cfgs

There are two kinds of configuration options (`cfg`s): names and
key-value pairs. So far, we only needed to support the former for the
`rust-analyzer` target.

Since we are introducing `syn` (and its dependencies) in later patches,
which require passing `feature` `cfg`s, support key-value `cfg`s too in
the `rust-analyzer` target.

Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Author: ojeda

rust/Makefile

@@ -413,7 +413,8 @@ quiet_cmd_rustc_library = $(if $(skip_clippy),RUSTC,$(RUSTC_OR_CLIPPY_QUIET)) L
 
 rust-analyzer:
 	$(Q)$(srctree)/scripts/generate_rust_analyzer.py \
-		--cfgs='core=$(core-cfgs)' --cfgs='alloc=$(alloc-cfgs)' \
+		--cfgs='core=$(call escsq,$(core-cfgs))' \
+		--cfgs='alloc=$(call escsq,$(alloc-cfgs))' \
 		$(realpath $(srctree)) $(realpath $(objtree)) \
 		$(RUST_LIB_SRC) $(KBUILD_EXTMOD) > \
 		$(if $(KBUILD_EXTMOD),$(extmod_prefix),$(objtree))/rust-project.json

scripts/generate_rust_analyzer.py

@@ -8,13 +8,14 @@
 import logging
 import os
 import pathlib
+import shlex
 import sys
 
 def args_crates_cfgs(cfgs):
     crates_cfgs = {}
     for cfg in cfgs:
         crate, vals = cfg.split("=", 1)
-        crates_cfgs[crate] = vals.replace("--cfg", "").split()
+        crates_cfgs[crate] = shlex.split(vals.replace("--cfg", ""))
 
     return crates_cfgs