kbuild: Fix ld-version.sh script if LLD was built with LLD_VENDOR

If LLD was built with -DLLD_VENDOR="xyz", ld.lld --version output
will prefix LLD_VENDOR. Since LLD_VENDOR can contain spaces, the
LLD identifier isn't guaranteed to be $2 either.

Adjust the version checker to handle such versions of lld.

Link: https://lore.kernel.org/lkml/20210302221211.1620858-1-bero@lindev.ch/
Signed-off-by: Bernhard Rosenkränzer <bero@lindev.ch>
[masahiro yamada: refactor the code]
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>

diff --git a/scripts/ld-version.sh b/scripts/ld-version.sh
index a463273..30debf7 100755 (executable)
--- a/scripts/ld-version.sh
+++ b/scripts/ld-version.sh
@@ -44,14 +44,20 @@ if [ "$1" = GNU -a "$2" = ld ]; then
 elif [ "$1" = GNU -a "$2" = gold ]; then
        echo "gold linker is not supported as it is not capable of linking the kernel proper." >&2
        exit 1
-elif [ "$1" = LLD ]; then
-       version=$2
-       min_version=$lld_min_version
-       name=LLD
-       disp_name=LLD
 else
-       echo "$orig_args: unknown linker" >&2
-       exit 1
+       while [ $# -gt 1 -a "$1" != "LLD" ]; do
+               shift
+       done
+
+       if [ "$1" = LLD ]; then
+               version=$2
+               min_version=$lld_min_version
+               name=LLD
+               disp_name=LLD
+       else
+               echo "$orig_args: unknown linker" >&2
+               exit 1
+       fi
 fi
 
 # Some distributions append a package release number, as in 2.34-4.fc32