scripts: refactor remove structure forward declarations

Since now it has some problems when generate TAGS,
refactor this code. Now it will not show the error
message and will remove declarations using emacs etags.

Signed-off-by: Yang Bai <hamo.by@gmail.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Michal Marek <mmarek@suse.cz>

diff --git a/scripts/tags.sh b/scripts/tags.sh
index 0bc8588..0d6004e 100755 (executable)
--- a/scripts/tags.sh
+++ b/scripts/tags.sh
@@ -166,9 +166,6 @@ exuberant()
        all_defconfigs | xargs -r $1 -a                         \
        --langdef=dotconfig --language-force=dotconfig          \
        --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'
-
-       # Remove structure forward declarations.
-       LANG=C sed -i -e '/^\([a-zA-Z_][a-zA-Z0-9_]*\)\t.*\t\/\^struct \1;.*\$\/;"\tx$/d' tags
 }
 
 emacs()
@@ -233,6 +230,7 @@ if [ "${ARCH}" = "um" ]; then
        fi
 fi
 
+remove_structs=
 case "$1" in
        "cscope")
                docscope
@@ -245,10 +243,17 @@ case "$1" in
        "tags")
                rm -f tags
                xtags ctags
+               remove_structs=y
                ;;
 
        "TAGS")
                rm -f TAGS
                xtags etags
+               remove_structs=y
                ;;
 esac
+
+# Remove structure forward declarations.
+if [ -n $remove_structs ]; then
+    LANG=C sed -i -e '/^\([a-zA-Z_][a-zA-Z0-9_]*\)\t.*\t\/\^struct \1;.*\$\/;"\tx$/d' $1
+fi