kbuild: clean up scripts/gcc-version.sh

Now that the Kconfig is the only user of this script, we can drop
unneeded code.

Remove the -p option, and stop prepending the output with zero,
so that Kconfig can directly use the output from this script.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>

init/Kconfig

@@ -13,7 +13,7 @@ config CC_IS_GCC
 
 config GCC_VERSION
 	int
-	default $(shell,$(srctree)/scripts/gcc-version.sh -p $(CC) | sed 's/^0*//') if CC_IS_GCC
+	default $(shell,$(srctree)/scripts/gcc-version.sh $(CC)) if CC_IS_GCC
 	default 0
 
 config CC_IS_CLANG

scripts/Kconfig.include

@@ -27,4 +27,4 @@ cc-option = $(success,$(CC) -Werror $(1) -E -x c /dev/null -o /dev/null)
 ld-option = $(success,$(LD) -v $(1))
 
 # gcc version including patch level
-gcc-version := $(shell,$(srctree)/scripts/gcc-version.sh -p $(CC) | sed 's/^0*//')
+gcc-version := $(shell,$(srctree)/scripts/gcc-version.sh $(CC))

scripts/gcc-version.sh

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 #
-# gcc-version [-p] gcc-command
-#
-# Prints the gcc version of `gcc-command' in a canonical 4-digit form
-# such as `0295' for gcc-2.95, `0303' for gcc-3.3, etc.
-#
-# With the -p option, prints the patchlevel as well, for example `029503' for
-# gcc-2.95.3, `030301' for gcc-3.3.1, etc.
+# gcc-version gcc-command
 #
-
-if [ "$1" = "-p" ] ; then
-	with_patchlevel=1;
-	shift;
-fi
+# Print the gcc version of `gcc-command' in a 5 or 6-digit form
+# such as `29503' for gcc-2.95.3, `30301' for gcc-3.3.1, etc.
 
 compiler="$*"
 
 if [ ${#compiler} -eq 0 ]; then
-	echo "Error: No compiler specified."
-	printf "Usage:\n\t$0 <gcc-command>\n"
+	echo "Error: No compiler specified." >&2
+	printf "Usage:\n\t$0 <gcc-command>\n" >&2
 	exit 1
 fi
 
 MAJOR=$(echo __GNUC__ | $compiler -E -x c - | tail -n 1)
 MINOR=$(echo __GNUC_MINOR__ | $compiler -E -x c - | tail -n 1)
-if [ "x$with_patchlevel" != "x" ] ; then
-	PATCHLEVEL=$(echo __GNUC_PATCHLEVEL__ | $compiler -E -x c - | tail -n 1)
-	printf "%02d%02d%02d\\n" $MAJOR $MINOR $PATCHLEVEL
-else
-	printf "%02d%02d\\n" $MAJOR $MINOR
-fi
+PATCHLEVEL=$(echo __GNUC_PATCHLEVEL__ | $compiler -E -x c - | tail -n 1)
+printf "%d%02d%02d\\n" $MAJOR $MINOR $PATCHLEVEL