buildsystem: save/load build config

config/functions

@@ -765,6 +765,22 @@ check_path() {
   fi
 }
 
+load_build_config() {
+  if [ -d "${1}" -a -f ${1}/.build.conf ]; then
+    source ${1}/.build.conf
+    return 0
+  fi
+  return 1
+}
+
+save_build_config() {
+  local var
+  rm -f ${BUILD}/.build.conf
+  for var in PROJECT DEVICE ARCH DEBUG BUILD_SUFFIX; do
+    echo "export ${var}=\"${!var}\"" >> ${BUILD}/.build.conf
+  done
+}
+
 check_config() {
   dashes="==========================="
   if [ ! -d $PROJECT_DIR/$PROJECT ]; then

scripts/image

@@ -25,6 +25,8 @@ unset _CACHE_PACKAGE_LOCAL _CACHE_PACKAGE_GLOBAL _DEBUG_DEPENDS_LIST _DEBUG_PACK
 . config/show_config
 show_config
 
+save_build_config
+
 setup_toolchain target
 
 $SCRIPTS/checkdeps