@@ -1002,7 +1002,6 @@ CMDLINE_SET="

     cpu

     cross_prefix

     dep_cc

-    extra_cflags

     extra_version

     host_cc

     host_cflags

@@ -1020,6 +1019,10 @@ CMDLINE_SET="

     target_path

 "

+CMDLINE_APPEND="

+    extra_cflags

+"

+

 # code dependency declarations

 # architecture extensions

@@ -1401,8 +1404,13 @@ for opt do

     optname="${opt%%=*}"

     optname="${optname#--}"

     optname=$(echo "$optname" | sed 's/-/_/g')

-    is_in $optname $CMDLINE_SET || die_unknown $opt

-    eval $optname='$optval'

+    if is_in $optname $CMDLINE_SET; then

+        eval $optname='$optval'

+    elif is_in $optname $CMDLINE_APPEND; then

+        append $optname "$optval"

+    else

+         die_unknown $opt

+    fi

     ;;

     esac

 done