abuild: add update_config_guess

Makefile

@@ -13,7 +13,7 @@ SCRIPTS		:= abuild abuild-keygen abuild-sign newapkbuild \
 USR_BIN_FILES	:= $(SCRIPTS) abuild-tar abuild-sudo abuild-fetch
 SAMPLES		:= sample.APKBUILD sample.initd sample.confd \
 		sample.pre-install sample.post-install
-AUTOTOOLS_TOOLCHAIN_FILES := config.sub
+AUTOTOOLS_TOOLCHAIN_FILES := config.sub config.guess
 
 SCRIPT_SOURCES	:= $(addsuffix .in,$(SCRIPTS))
 

abuild.in

@@ -521,6 +521,23 @@ update_config_sub() {
 	return $?
 }
 
+# helper to update config.guess to a recent version
+update_config_guess() {
+	local changed=false
+	find . -name config.guess | while read f; do
+		if grep -q aarch64 "$f"; then
+			msg "No update needed for $f"
+		else
+			msg "Updating $f"
+			cp "$datadir"/${f##*/} "$f" || return 1
+			changed=true
+		fi
+		# pipe subshell will return status of last command
+		$changed
+	done
+	return $?
+}
+
 runpart() {
 	local part=$1
 	[ -n "$DEBUG" ] && msg "$part"