[openwrt/openwrt] scripts: ext-toolchain: add option to overwrite config

[LEDE Commits]

ansuel pushed a commit to openwrt/openwrt.git, branch openwrt-21.02:
https://git.openwrt.org/ed785589ea9a11d526a01067b79af4fe1b5dd5b7

commit ed785589ea9a11d526a01067b79af4fe1b5dd5b7
Author: Christian Marangi <ansuelsmth at gmail.com>
AuthorDate: Mon Jul 4 18:22:18 2022 +0200

    scripts: ext-toolchain: add option to overwrite config
    
    It can be useful to overwrite an already generated config.
    Option are simply added at the end of the config and make defconfig
    will overwrite the relevant option with the new one.
    
    Signed-off-by: Christian Marangi <ansuelsmth at gmail.com>
    (cherry picked from commit f4dd18ca39c42a324e34633c8ee553717531bc3b)
---
 scripts/ext-toolchain.sh | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/scripts/ext-toolchain.sh b/scripts/ext-toolchain.sh
index b52f170b32..c9ceb150c1 100755
--- a/scripts/ext-toolchain.sh
+++ b/scripts/ext-toolchain.sh
@@ -50,6 +50,7 @@ BIN_SPECS="
 	gdbserver: gdbserver
 "
 
+OVERWRITE_CONFIG=""
 
 test_c() {
 	cat <<-EOT | "${CC:-false}" $CFLAGS -o /dev/null -x c - 2>/dev/null
@@ -320,9 +321,13 @@ print_config() {
 	fi
 
 	# bail out if there is a .config already
-	if [ -f "${0%/scripts/*}/.config" ]; then
-		echo "There already is a .config file, refusing to overwrite!" >&2
-		return 1
+	if [ -f "$config" ]; then
+		if [ "$OVERWRITE_CONFIG" == "" ]; then
+			echo "There already is a .config file, refusing to overwrite!" >&2
+			return 1
+		else
+			echo "There already is a .config file, trying to overwrite!"
+		fi
 	fi
 
 	case "$mktarget" in */*)
@@ -330,8 +335,11 @@ print_config() {
 		mktarget="${mktarget%/*}"
 	;; esac
 
+	if [ ! -f "$config" ]; then
+		touch "$config"
+	fi
 
-	echo "CONFIG_TARGET_${mktarget}=y" > "$config"
+	echo "CONFIG_TARGET_${mktarget}=y" >> "$config"
 
 	if [ -n "$mksubtarget" ]; then
 		echo "CONFIG_TARGET_${mktarget}_${mksubtarget}=y" >> "$config"
@@ -532,6 +540,10 @@ while [ -n "$1" ]; do
 			exit $?
 		;;
 
+		--overwrite-config)
+			OVERWRITE_CONFIG=y
+		;;
+
 		--config)
 			if probe_cc; then
 				print_config "$1"
@@ -573,6 +585,8 @@ while [ -n "$1" ]; do
 			echo -e "  is used to specify C flags to be passed to the "     >&2
 			echo -e "  cross compiler when performing tests."               >&2
 			echo -e "  This parameter may be repeated multiple times."      >&2
+			echo -e "  Use --overwrite-config before --config to overwrite" >&2
+			echo -e "  an already present config with the required changes.">&2
 			exit 1
 		;;