KCONFIG_ADD currently expects a list of files to be merged.
As MAKEALL is a bash script, let's make use of process substitution
to create temporary files out of -k CONFIG_foo=bar options.

Signed-off-by: Ahmad Fatoum <a.fat...@pengutronix.de>
---
 MAKEALL | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/MAKEALL b/MAKEALL
index 1966eedb4673..b0967b8ae340 100755
--- a/MAKEALL
+++ b/MAKEALL
@@ -56,7 +56,7 @@ usage() {
        echo "BUILDDIR    -O      build dir"
        echo "LOGDIR      -l      log dir"
        echo "REGEX       -e      regex"
-       echo "KCONFIG_ADD -k      kconfig fragment"
+       echo "KCONFIG_ADD -k      kconfig fragment or option"
        echo "TARGET      -t      Makefile target"
        echo "V           -v      verbosity"
        echo "INCREMENTAL -i"
@@ -116,6 +116,11 @@ report() {
        fi
 }
 
+merge_config() {
+       with_logs_collected ./scripts/kconfig/merge_config.sh -m -O \
+               ${BUILDDIR} "$@"
+}
+
 do_build_defconfig() {
        local arch=$1
        local defconfig=$2
@@ -156,8 +161,11 @@ do_build_defconfig() {
        MAKE="${MAKE} $silent_flag CROSS_COMPILE=${cross_compile}"
        with_logs_collected ${MAKE} ${defconfig}
        for i in ${KCONFIG_ADD}; do
-               with_logs_collected ./scripts/kconfig/merge_config.sh -m -O \
-                       ${BUILDDIR} ${BUILDDIR}/.config $i
+               if [[ $i =~ ^CONFIG_* ]]; then
+                       merge_config ${BUILDDIR}/.config <(echo $i)
+               else
+                       merge_config ${BUILDDIR}/.config $i
+               fi
        done
        with_logs_collected ${MAKE} $silent_flag olddefconfig
 
-- 
2.39.5


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