scripts/config: allow alternate prefix to config option symbol

While the Linux kernel uses 'CONFIG_' as a prefix to the config options
symbols, many projects that use kconfig may use different prefixes, or
even none at all.

If the CONFIG_ environment variable is set, use it as the prefix (empty
is a valid prefix). Otherwise, use the default prefix 'CONFIG_'.

This matches the support for alternate prefixes in scripts/kconfig/lkc.h,
which uses the same logic (albeit with a C define instead of an environment
variable).

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Michal Marek <mmarek@suse.cz>

1 files changed, 19 insertions, 13 deletions

diff --git a/scripts/config b/scripts/config
index c5639fe5bba8..9723c7de07cc 100755
--- a/scripts/config
+++ b/scripts/config
@@ -1,6 +1,9 @@
 #!/bin/bash
 # Manipulate options in a .config file from the command line
 
+# If no prefix forced, use the default CONFIG_
+CONFIG_="${CONFIG_-CONFIG_}"
+
 usage() {
         cat >&2 <<EOL
 Manipulate options in a .config file from the command line.
@@ -34,6 +37,9 @@ make time.
 
 By default, config will upper-case the given symbol. Use --keep-case to keep
 the case of all following symbols unchanged.
+
+config uses 'CONFIG_' as the default symbol prefix. Set the environment
+variable CONFIG_ to the prefix to use. Eg.: CONFIG_="FOO_" config ...
 EOL
         exit 1
 }
@@ -44,8 +50,8 @@ checkarg() {
                 usage
         fi
         case "$ARG" in
-        CONFIG_*)
-                ARG="${ARG/CONFIG_/}"
+        ${CONFIG_}*)
+                ARG="${ARG/${CONFIG_}/}"
                 ;;
         esac
         if [ "$MUNGE_CASE" = "yes" ] ; then
@@ -107,37 +113,37 @@ while [ "$1" != "" ] ; do
         esac
         case "$CMD" in
         --enable|-e)
-                set_var "CONFIG_$ARG" "CONFIG_$ARG=y"
+                set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=y"
                 ;;
 
         --disable|-d)
-                set_var "CONFIG_$ARG" "# CONFIG_$ARG is not set"
+                set_var "${CONFIG_}$ARG" "# ${CONFIG_}$ARG is not set"
                 ;;
 
         --module|-m)
-                set_var "CONFIG_$ARG" "CONFIG_$ARG=m"
+                set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=m"
                 ;;
 
         --set-str)
                 # sed swallows one level of escaping, so we need double-escaping
-                set_var "CONFIG_$ARG" "CONFIG_$ARG=\"${1//\"/\\\\\"}\""
+                set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=\"${1//\"/\\\\\"}\""
                 shift
                 ;;
 
         --set-val)
-                set_var "CONFIG_$ARG" "CONFIG_$ARG=$1"
+                set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=$1"
                 shift
                 ;;
 
         --state|-s)
-                if grep -q "# CONFIG_$ARG is not set" $FN ; then
+                if grep -q "# ${CONFIG_}$ARG is not set" $FN ; then
                         echo n
                 else
-                        V="$(grep "^CONFIG_$ARG=" $FN)"
+                        V="$(grep "^${CONFIG_}$ARG=" $FN)"
                         if [ $? != 0 ] ; then
                                 echo undef
                         else
-                                V="${V/#CONFIG_$ARG=/}"
+                                V="${V/#${CONFIG_}$ARG=/}"
                                 V="${V/#\"/}"
                                 V="${V/%\"/}"
                                 V="${V/\\\"/\"}"
@@ -147,15 +153,15 @@ while [ "$1" != "" ] ; do
                 ;;
 
         --enable-after|-E)
-                set_var "CONFIG_$B" "CONFIG_$B=y" "CONFIG_$A"
+                set_var "${CONFIG_}$B" "${CONFIG_}$B=y" "${CONFIG_}$A"
                 ;;
 
         --disable-after|-D)
-                set_var "CONFIG_$B" "# CONFIG_$B is not set" "CONFIG_$A"
+                set_var "${CONFIG_}$B" "# ${CONFIG_}$B is not set" "${CONFIG_}$A"
                 ;;
 
         --module-after|-M)
-                set_var "CONFIG_$B" "CONFIG_$B=m" "CONFIG_$A"
+                set_var "${CONFIG_}$B" "${CONFIG_}$B=m" "${CONFIG_}$A"
                 ;;
 
         # undocumented because it ignores --file (fixme)