kbuild: rust_is_available: fix version check when CC has multiple arguments

[ Upstream commit dee3a6b ]

rust_is_available.sh uses cc-version.sh to identify which C compiler is
in use, as scripts/Kconfig.include does.  cc-version.sh isn't designed to
be able to handle multiple arguments in one variable, i.e. "ccache clang".
Its invocation in rust_is_available.sh quotes "$CC", which makes
$1 == "ccache clang" instead of the intended $1 == ccache & $2 == clang.

cc-version.sh could also be changed to handle having "ccache clang" as one
argument, but it only has the one consumer upstream, making it simpler to
fix the caller here.

Signed-off-by: Russell Currey <[email protected]>
Fixes: 78521f3 ("scripts: add `rust_is_available.sh`")
Link: Rust-for-Linux#873
[ Reworded title prefix and reflow line to 75 columns. ]
Reviewed-by: Martin Rodriguez Reboredo <[email protected]>
Reviewed-by: Nathan Chancellor <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Miguel Ojeda <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>

Author: ruscur

scripts/rust_is_available.sh

@@ -113,10 +113,10 @@ fi
 #
 # In the future, we might be able to perform a full version check, see
 # https://github.com/rust-lang/rust-bindgen/issues/2138.
-cc_name=$($(dirname $0)/cc-version.sh "$CC" | cut -f1 -d' ')
+cc_name=$($(dirname $0)/cc-version.sh $CC | cut -f1 -d' ')
 if [ "$cc_name" = Clang ]; then
 	clang_version=$( \
-		LC_ALL=C "$CC" --version 2>/dev/null \
+		LC_ALL=C $CC --version 2>/dev/null \
 			| sed -nE '1s:.*version ([0-9]+\.[0-9]+\.[0-9]+).*:\1:p'
 	)
 	if [ "$clang_version" != "$bindgen_libclang_version" ]; then